Merge branch 'master' into tab_key

87 files changed, 2374 insertions, 748 deletions

diff --git a/modules/mono/.gitignore b/modules/mono/.gitignore
new file mode 100644
index 0000000000..fa6d00cbbb
--- /dev/null
+++ b/modules/mono/.gitignore
@@ -0,0 +1,2 @@
+# Do not ignore solution files inside the mono module. Overrides Godot's global gitignore.
+!*.sln
diff --git a/modules/mono/SCsub b/modules/mono/SCsub
index cc60e64a11..a9afa7ccf6 100644
--- a/modules/mono/SCsub
+++ b/modules/mono/SCsub
@@ -8,13 +8,7 @@ Import('env_modules')
 
 env_mono = env_modules.Clone()
 
-env_mono.add_source_files(env.modules_sources, '*.cpp')
-env_mono.add_source_files(env.modules_sources, 'glue/*.cpp')
-env_mono.add_source_files(env.modules_sources, 'mono_gd/*.cpp')
-env_mono.add_source_files(env.modules_sources, 'utils/*.cpp')
-
 if env['tools']:
-    env_mono.add_source_files(env.modules_sources, 'editor/*.cpp')
     # NOTE: It is safe to generate this file here, since this is still executed serially
     import build_scripts.make_cs_compressed_header as make_cs_compressed_header
     make_cs_compressed_header.generate_header(
@@ -62,3 +56,13 @@ if env_mono['tools']:
         # GodotTools.ProjectEditor which doesn't depend on the Godot API solution and
         # is required by the bindings generator in order to be able to generated it.
         godot_tools_build.build_project_editor_only(env_mono)
+
+# Add sources
+
+env_mono.add_source_files(env.modules_sources, '*.cpp')
+env_mono.add_source_files(env.modules_sources, 'glue/*.cpp')
+env_mono.add_source_files(env.modules_sources, 'mono_gd/*.cpp')
+env_mono.add_source_files(env.modules_sources, 'utils/*.cpp')
+
+if env['tools']:
+    env_mono.add_source_files(env.modules_sources, 'editor/*.cpp')
diff --git a/modules/mono/build_scripts/godot_tools_build.py b/modules/mono/build_scripts/godot_tools_build.py
index c47cfc8a38..35daa6d307 100644
--- a/modules/mono/build_scripts/godot_tools_build.py
+++ b/modules/mono/build_scripts/godot_tools_build.py
@@ -84,10 +84,16 @@ def build(env_mono):
     source_filenames = ['GodotSharp.dll', 'GodotSharpEditor.dll']
     sources = [os.path.join(editor_api_dir, filename) for filename in source_filenames]
 
-    target_filenames = ['GodotTools.dll', 'GodotTools.BuildLogger.dll', 'GodotTools.ProjectEditor.dll', 'DotNet.Glob.dll', 'GodotTools.Core.dll']
+    target_filenames = [
+        'GodotTools.dll', 'GodotTools.IdeConnection.dll', 'GodotTools.BuildLogger.dll',
+        'GodotTools.ProjectEditor.dll', 'DotNet.Glob.dll', 'GodotTools.Core.dll'
+    ]
 
     if env_mono['target'] == 'debug':
-        target_filenames += ['GodotTools.pdb', 'GodotTools.BuildLogger.pdb', 'GodotTools.ProjectEditor.pdb', 'GodotTools.Core.pdb']
+        target_filenames += [
+            'GodotTools.pdb', 'GodotTools.IdeConnection.pdb', 'GodotTools.BuildLogger.pdb',
+            'GodotTools.ProjectEditor.pdb', 'GodotTools.Core.pdb'
+        ]
 
     targets = [os.path.join(editor_tools_dir, filename) for filename in target_filenames]
 
diff --git a/modules/mono/build_scripts/make_android_mono_config.py b/modules/mono/build_scripts/make_android_mono_config.py
index cd9210897d..8cad204d7b 100644
--- a/modules/mono/build_scripts/make_android_mono_config.py
+++ b/modules/mono/build_scripts/make_android_mono_config.py
@@ -3,23 +3,6 @@ def generate_compressed_config(config_src, output_dir):
     import os.path
     from compat import byte_to_str
 
-    # Header file
-    with open(os.path.join(output_dir, 'android_mono_config.gen.h'), 'w') as header:
-        header.write('''/* THIS FILE IS GENERATED DO NOT EDIT */
-#ifndef ANDROID_MONO_CONFIG_GEN_H
-#define ANDROID_MONO_CONFIG_GEN_H
-
-#ifdef ANDROID_ENABLED
-
-#include "core/ustring.h"
-
-String get_godot_android_mono_config();
-
-#endif // ANDROID_ENABLED
-
-#endif // ANDROID_MONO_CONFIG_GEN_H
-''')
-
     # Source file
     with open(os.path.join(output_dir, 'android_mono_config.gen.cpp'), 'w') as cpp:
         with open(config_src, 'rb') as f:
@@ -36,7 +19,7 @@ String get_godot_android_mono_config();
                 bytes_seq_str += byte_to_str(buf[buf_idx])
 
             cpp.write('''/* THIS FILE IS GENERATED DO NOT EDIT */
-#include "android_mono_config.gen.h"
+#include "android_mono_config.h"
 
 #ifdef ANDROID_ENABLED
 
diff --git a/modules/mono/build_scripts/mono_configure.py b/modules/mono/build_scripts/mono_configure.py
index 9f0eb58896..f751719531 100644
--- a/modules/mono/build_scripts/mono_configure.py
+++ b/modules/mono/build_scripts/mono_configure.py
@@ -113,8 +113,8 @@ def configure(env, env_mono):
             else:
                 env.Append(LINKFLAGS=os.path.join(mono_lib_path, mono_static_lib_name + lib_suffix))
 
-                env.Append(LIBS='psapi')
-                env.Append(LIBS='version')
+                env.Append(LIBS=['psapi'])
+                env.Append(LIBS=['version'])
         else:
             mono_lib_name = find_file_in_dir(mono_lib_path, mono_lib_names, extension='.lib')
 
@@ -124,7 +124,7 @@ def configure(env, env_mono):
             if env.msvc:
                 env.Append(LINKFLAGS=mono_lib_name + Environment()['LIBSUFFIX'])
             else:
-                env.Append(LIBS=mono_lib_name)
+                env.Append(LIBS=[mono_lib_name])
 
             mono_bin_path = os.path.join(mono_root, 'bin')
 
diff --git a/modules/mono/class_db_api_json.cpp b/modules/mono/class_db_api_json.cpp
index 4a6637434a..7580911a0a 100644
--- a/modules/mono/class_db_api_json.cpp
+++ b/modules/mono/class_db_api_json.cpp
@@ -5,8 +5,8 @@
 /*                           GODOT ENGINE                                */
 /*                      https://godotengine.org                          */
 /*************************************************************************/
-/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
 /*                                                                       */
 /* Permission is hereby granted, free of charge, to any person obtaining */
 /* a copy of this software and associated documentation files (the       */
diff --git a/modules/mono/class_db_api_json.h b/modules/mono/class_db_api_json.h
index ddfe2debea..9888ecfb55 100644
--- a/modules/mono/class_db_api_json.h
+++ b/modules/mono/class_db_api_json.h
@@ -5,8 +5,8 @@
 /*                           GODOT ENGINE                                */
 /*                      https://godotengine.org                          */
 /*************************************************************************/
-/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
 /*                                                                       */
 /* Permission is hereby granted, free of charge, to any person obtaining */
 /* a copy of this software and associated documentation files (the       */
diff --git a/modules/mono/csharp_script.cpp b/modules/mono/csharp_script.cpp
index 078a490b22..e14e919f92 100644
--- a/modules/mono/csharp_script.cpp
+++ b/modules/mono/csharp_script.cpp
@@ -115,7 +115,7 @@ void CSharpLanguage::init() {
 	gdmono->initialize();
 
 #if defined(TOOLS_ENABLED) && defined(DEBUG_METHODS_ENABLED)
-	// Generate bindings here, before loading assemblies. `initialize_load_assemblies` aborts
+	// Generate bindings here, before loading assemblies. 'initialize_load_assemblies' aborts
 	// the applications if the api assemblies or the main tools assembly is missing, but this
 	// is not a problem for BindingsGenerator as it only needs the tools project editor assembly.
 	List<String> cmdline_args = OS::get_singleton()->get_cmdline_args();
@@ -123,7 +123,7 @@ void CSharpLanguage::init() {
 #endif
 
 #ifndef MONO_GLUE_ENABLED
-	print_line("Run this binary with `--generate-mono-glue path/to/modules/mono/glue`");
+	print_line("Run this binary with '--generate-mono-glue path/to/modules/mono/glue'");
 #endif
 
 	gdmono->initialize_load_assemblies();
@@ -629,7 +629,6 @@ void CSharpLanguage::frame() {
 
 				if (exc) {
 					GDMonoUtils::debug_unhandled_exception(exc);
-					GD_UNREACHABLE();
 				}
 			}
 		}
@@ -1037,6 +1036,7 @@ void CSharpLanguage::_load_scripts_metadata() {
 		String old_json;
 
 		Error ferr = read_all_file_utf8(scripts_metadata_path, old_json);
+
 		ERR_FAIL_COND(ferr != OK);
 
 		Variant old_dict_var;
@@ -1044,7 +1044,7 @@ void CSharpLanguage::_load_scripts_metadata() {
 		int err_line;
 		Error json_err = JSON::parse(old_json, old_dict_var, err_str, err_line);
 		if (json_err != OK) {
-			ERR_PRINTS("Failed to parse metadata file: '" + err_str + "' (" + String::num_int64(err_line) + ")");
+			ERR_PRINTS("Failed to parse metadata file: '" + err_str + "' (" + String::num_int64(err_line) + ").");
 			return;
 		}
 
@@ -1054,7 +1054,7 @@ void CSharpLanguage::_load_scripts_metadata() {
 		print_verbose("Successfully loaded scripts metadata");
 	} else {
 		if (!Engine::get_singleton()->is_editor_hint()) {
-			ERR_PRINT("Missing scripts metadata file");
+			ERR_PRINT("Missing scripts metadata file.");
 		}
 	}
 }
@@ -1101,7 +1101,7 @@ bool CSharpLanguage::debug_break_parse(const String &p_file, int p_line, const S
 		_debug_parse_err_line = p_line;
 		_debug_parse_err_file = p_file;
 		_debug_error = p_error;
-		ScriptDebugger::get_singleton()->debug(this, false);
+		ScriptDebugger::get_singleton()->debug(this, false, true);
 		return true;
 	} else {
 		return false;
@@ -1769,12 +1769,8 @@ MonoObject *CSharpInstance::_internal_new_managed() {
 
 	// Search the constructor first, to fail with an error if it's not found before allocating anything else.
 	GDMonoMethod *ctor = script->script_class->get_method(CACHED_STRING_NAME(dotctor), 0);
-	if (ctor == NULL) {
-		ERR_PRINTS("Cannot create script instance because the class does not define a parameterless constructor: " + script->get_path());
-
-		ERR_EXPLAIN("Constructor not found");
-		ERR_FAIL_V(NULL);
-	}
+	ERR_FAIL_NULL_V_MSG(ctor, NULL,
+			"Cannot create script instance because the class does not define a parameterless constructor: '" + script->get_path() + "'.");
 
 	CSharpLanguage::get_singleton()->release_script_gchandle(gchandle);
 
@@ -1793,8 +1789,7 @@ MonoObject *CSharpInstance::_internal_new_managed() {
 
 		owner = NULL;
 
-		ERR_EXPLAIN("Failed to allocate memory for the object");
-		ERR_FAIL_V(NULL);
+		ERR_FAIL_V_MSG(NULL, "Failed to allocate memory for the object.");
 	}
 
 	// Tie managed to unmanaged
@@ -2234,7 +2229,7 @@ bool CSharpScript::_update_exports() {
 		MonoObject *tmp_object = mono_object_new(mono_domain_get(), script_class->get_mono_ptr());
 
 		if (!tmp_object) {
-			ERR_PRINT("Failed to allocate temporary MonoObject");
+			ERR_PRINT("Failed to allocate temporary MonoObject.");
 			return false;
 		}
 
@@ -2242,12 +2237,8 @@ bool CSharpScript::_update_exports() {
 
 		GDMonoMethod *ctor = script_class->get_method(CACHED_STRING_NAME(dotctor), 0);
 
-		if (ctor == NULL) {
-			ERR_PRINTS("Cannot construct temporary MonoObject because the class does not define a parameterless constructor: " + get_path());
-
-			ERR_EXPLAIN("Constructor not found");
-			ERR_FAIL_V(NULL);
-		}
+		ERR_FAIL_NULL_V_MSG(ctor, NULL,
+				"Cannot construct temporary MonoObject because the class does not define a parameterless constructor: '" + get_path() + "'.");
 
 		MonoException *ctor_exc = NULL;
 		ctor->invoke(tmp_object, NULL, &ctor_exc);
@@ -2400,7 +2391,7 @@ bool CSharpScript::_get_signal(GDMonoClass *p_class, GDMonoClass *p_delegate, Ve
 					arg.type = GDMonoMarshal::managed_to_variant_type(types[i]);
 
 					if (arg.type == Variant::NIL) {
-						ERR_PRINTS("Unknown type of signal parameter: " + arg.name + " in " + p_class->get_full_name());
+						ERR_PRINTS("Unknown type of signal parameter: '" + arg.name + "' in '" + p_class->get_full_name() + "'.");
 						return false;
 					}
 
@@ -2428,7 +2419,7 @@ bool CSharpScript::_get_member_export(IMonoClassMember *p_member, bool p_inspect
 
 	if (p_member->is_static()) {
 		if (p_member->has_attribute(CACHED_CLASS(ExportAttribute)))
-			ERR_PRINTS("Cannot export member because it is static: " + MEMBER_FULL_QUALIFIED_NAME(p_member));
+			ERR_PRINTS("Cannot export member because it is static: '" + MEMBER_FULL_QUALIFIED_NAME(p_member) + "'.");
 		return false;
 	}
 
@@ -2451,12 +2442,12 @@ bool CSharpScript::_get_member_export(IMonoClassMember *p_member, bool p_inspect
 		GDMonoProperty *property = static_cast<GDMonoProperty *>(p_member);
 		if (!property->has_getter()) {
 			if (exported)
-				ERR_PRINTS("Read-only property cannot be exported: " + MEMBER_FULL_QUALIFIED_NAME(p_member));
+				ERR_PRINTS("Read-only property cannot be exported: '" + MEMBER_FULL_QUALIFIED_NAME(p_member) + "'.");
 			return false;
 		}
 		if (!property->has_setter()) {
 			if (exported)
-				ERR_PRINTS("Write-only property (without getter) cannot be exported: " + MEMBER_FULL_QUALIFIED_NAME(p_member));
+				ERR_PRINTS("Write-only property (without getter) cannot be exported: '" + MEMBER_FULL_QUALIFIED_NAME(p_member) + "'.");
 			return false;
 		}
 	}
@@ -2475,16 +2466,15 @@ bool CSharpScript::_get_member_export(IMonoClassMember *p_member, bool p_inspect
 	String hint_string;
 
 	if (variant_type == Variant::NIL) {
-		ERR_PRINTS("Unknown exported member type: " + MEMBER_FULL_QUALIFIED_NAME(p_member));
+		ERR_PRINTS("Unknown exported member type: '" + MEMBER_FULL_QUALIFIED_NAME(p_member) + "'.");
 		return false;
 	}
 
 	int hint_res = _try_get_member_export_hint(p_member, type, variant_type, /* allow_generics: */ true, hint, hint_string);
 
-	if (hint_res == -1) {
-		ERR_EXPLAIN("Error while trying to determine information about the exported member: " + MEMBER_FULL_QUALIFIED_NAME(p_member));
-		ERR_FAIL_V(false);
-	}
+	ERR_FAIL_COND_V_MSG(hint_res == -1, false,
+			"Error while trying to determine information about the exported member: '" +
+					MEMBER_FULL_QUALIFIED_NAME(p_member) + "'.");
 
 	if (hint_res == 0) {
 		hint = PropertyHint(CACHED_FIELD(ExportAttribute, hint)->get_int_value(attr));
@@ -2533,17 +2523,11 @@ int CSharpScript::_try_get_member_export_hint(IMonoClassMember *p_member, Manage
 
 			MonoObject *val_obj = mono_field_get_value_object(mono_domain_get(), field, NULL);
 
-			if (val_obj == NULL) {
-				ERR_EXPLAIN("Failed to get '" + enum_field_name + "' constant enum value");
-				ERR_FAIL_V(-1);
-			}
+			ERR_FAIL_NULL_V_MSG(val_obj, -1, "Failed to get '" + enum_field_name + "' constant enum value.");
 
 			bool r_error;
 			uint64_t val = GDMonoUtils::unbox_enum_value(val_obj, enum_basetype, r_error);
-			if (r_error) {
-				ERR_EXPLAIN("Failed to unbox '" + enum_field_name + "' constant enum value");
-				ERR_FAIL_V(-1);
-			}
+			ERR_FAIL_COND_V_MSG(r_error, -1, "Failed to unbox '" + enum_field_name + "' constant enum value.");
 
 			if (val != (unsigned int)i) {
 				uses_default_values = false;
@@ -2578,17 +2562,11 @@ int CSharpScript::_try_get_member_export_hint(IMonoClassMember *p_member, Manage
 		PropertyHint elem_hint = PROPERTY_HINT_NONE;
 		String elem_hint_string;
 
-		if (elem_variant_type == Variant::NIL) {
-			ERR_EXPLAIN("Unknown array element type");
-			ERR_FAIL_V(-1);
-		}
+		ERR_FAIL_COND_V_MSG(elem_variant_type == Variant::NIL, -1, "Unknown array element type.");
 
 		int hint_res = _try_get_member_export_hint(p_member, elem_type, elem_variant_type, /* allow_generics: */ false, elem_hint, elem_hint_string);
 
-		if (hint_res == -1) {
-			ERR_EXPLAIN("Error while trying to determine information about the array element type");
-			ERR_FAIL_V(-1);
-		}
+		ERR_FAIL_COND_V_MSG(hint_res == -1, -1, "Error while trying to determine information about the array element type.");
 
 		// Format: type/hint:hint_string
 		r_hint_string = itos(elem_variant_type) + "/" + itos(elem_hint) + ":" + elem_hint_string;
@@ -2683,7 +2661,7 @@ void CSharpScript::_get_property_list(List<PropertyInfo> *p_properties) const {
 
 void CSharpScript::_bind_methods() {
 
-	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &CSharpScript::_new, MethodInfo(Variant::OBJECT, "new"));
+	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &CSharpScript::_new, MethodInfo("new"));
 }
 
 Ref<CSharpScript> CSharpScript::create_for_managed_type(GDMonoClass *p_class, GDMonoClass *p_native) {
@@ -2776,7 +2754,7 @@ bool CSharpScript::can_instance() const {
 						"Compile",
 						ProjectSettings::get_singleton()->globalize_path(get_path()));
 			} else {
-				ERR_PRINTS("Cannot add " + get_path() + " to the C# project because it could not be created.");
+				ERR_PRINTS("C# project could not be created; cannot add file: '" + get_path() + "'.");
 			}
 		}
 	}
@@ -2794,12 +2772,10 @@ bool CSharpScript::can_instance() const {
 	if (extra_cond && !script_class) {
 		if (GDMono::get_singleton()->get_project_assembly() == NULL) {
 			// The project assembly is not loaded
-			ERR_EXPLAIN("Cannot instance script because the project assembly is not loaded. Script: " + get_path());
-			ERR_FAIL_V(NULL);
+			ERR_FAIL_V_MSG(NULL, "Cannot instance script because the project assembly is not loaded. Script: '" + get_path() + "'.");
 		} else {
 			// The project assembly is loaded, but the class could not found
-			ERR_EXPLAIN("Cannot instance script because the class '" + name + "' could not be found. Script: " + get_path());
-			ERR_FAIL_V(NULL);
+			ERR_FAIL_V_MSG(NULL, "Cannot instance script because the class '" + name + "' could not be found. Script: '" + get_path() + "'.");
 		}
 	}
 
@@ -2821,14 +2797,12 @@ CSharpInstance *CSharpScript::_create_instance(const Variant **p_args, int p_arg
 	// Search the constructor first, to fail with an error if it's not found before allocating anything else.
 	GDMonoMethod *ctor = script_class->get_method(CACHED_STRING_NAME(dotctor), p_argcount);
 	if (ctor == NULL) {
-		if (p_argcount == 0) {
-			String path = get_path();
-			ERR_PRINTS("Cannot create script instance. The class '" + script_class->get_full_name() +
-					   "' does not define a parameterless constructor." + (path.empty() ? String() : ". Path: " + path));
-		}
+		ERR_FAIL_COND_V_MSG(p_argcount == 0, NULL,
+				"Cannot create script instance. The class '" + script_class->get_full_name() +
+						"' does not define a parameterless constructor." +
+						(get_path().empty() ? String() : " Path: '" + get_path() + "'."));
 
-		ERR_EXPLAIN("Constructor not found");
-		ERR_FAIL_V(NULL);
+		ERR_FAIL_V_MSG(NULL, "Constructor not found.");
 	}
 
 	Ref<Reference> ref;
@@ -2879,8 +2853,7 @@ CSharpInstance *CSharpScript::_create_instance(const Variant **p_args, int p_arg
 
 		p_owner->set_script_instance(NULL);
 		r_error.error = Variant::CallError::CALL_ERROR_INSTANCE_IS_NULL;
-		ERR_EXPLAIN("Failed to allocate memory for the object");
-		ERR_FAIL_V(NULL);
+		ERR_FAIL_V_MSG(NULL, "Failed to allocate memory for the object.");
 	}
 
 	// Tie managed to unmanaged
@@ -2914,11 +2887,10 @@ Variant CSharpScript::_new(const Variant **p_args, int p_argcount, Variant::Call
 
 	r_error.error = Variant::CallError::CALL_OK;
 	REF ref;
-	Object *owner = NULL;
 
 	ERR_FAIL_NULL_V(native, Variant());
 
-	owner = ClassDB::instance(NATIVE_GDMONOCLASS_NAME(native));
+	Object *owner = ClassDB::instance(NATIVE_GDMONOCLASS_NAME(native));
 
 	Reference *r = Object::cast_to<Reference>(owner);
 	if (r) {
@@ -2952,8 +2924,8 @@ ScriptInstance *CSharpScript::instance_create(Object *p_this) {
 			if (ScriptDebugger::get_singleton()) {
 				CSharpLanguage::get_singleton()->debug_break_parse(get_path(), 0, "Script inherits from native type '" + native_name + "', so it can't be instanced in object of type: '" + p_this->get_class() + "'");
 			}
-			ERR_EXPLAIN("Script inherits from native type '" + native_name + "', so it can't be instanced in object of type: '" + p_this->get_class() + "'");
-			ERR_FAIL_V(NULL);
+			ERR_FAIL_V_MSG(NULL, "Script inherits from native type '" + native_name +
+										 "', so it can't be instanced in object of type: '" + p_this->get_class() + "'.");
 		}
 	}
 
@@ -3205,12 +3177,12 @@ int CSharpScript::get_member_line(const StringName &p_member) const {
 Error CSharpScript::load_source_code(const String &p_path) {
 
 	Error ferr = read_all_file_utf8(p_path, source);
-	if (ferr != OK) {
-		if (ferr == ERR_INVALID_DATA) {
-			ERR_EXPLAIN("Script '" + p_path + "' contains invalid unicode (utf-8), so it was not loaded. Please ensure that scripts are saved in valid utf-8 unicode.");
-		}
-		ERR_FAIL_V(ferr);
-	}
+
+	ERR_FAIL_COND_V_MSG(ferr != OK, ferr,
+			ferr == ERR_INVALID_DATA ?
+					"Script '" + p_path + "' contains invalid unicode (UTF-8), so it was not loaded."
+										  " Please ensure that scripts are saved in valid UTF-8 unicode." :
+					"Failed to read file: '" + p_path + "'.");
 
 #ifdef TOOLS_ENABLED
 	source_changed_cache = true;
@@ -3279,8 +3251,7 @@ RES ResourceFormatLoaderCSharpScript::load(const String &p_path, const String &p
 
 #ifdef DEBUG_ENABLED
 	// User is responsible for thread attach/detach
-	ERR_EXPLAIN("Thread is not attached");
-	CRASH_COND(mono_domain_get() == NULL);
+	CRASH_COND_MSG(mono_domain_get() == NULL, "Thread is not attached.");
 #endif
 
 #endif
@@ -3347,8 +3318,7 @@ Error ResourceFormatSaverCSharpScript::save(const String &p_path, const RES &p_r
 					"Compile",
 					ProjectSettings::get_singleton()->globalize_path(p_path));
 		} else {
-			ERR_PRINTS("Failed to create C# project");
-			ERR_PRINTS("Cannot add " + p_path + " to the C# project");
+			ERR_PRINTS("C# project could not be created; cannot add file: '" + p_path + "'.");
 		}
 	}
 #endif
diff --git a/modules/mono/editor/GodotTools/GodotTools.BuildLogger/GodotTools.BuildLogger.csproj b/modules/mono/editor/GodotTools/GodotTools.BuildLogger/GodotTools.BuildLogger.csproj
index f3ac353c0f..dcfdd83831 100644
--- a/modules/mono/editor/GodotTools/GodotTools.BuildLogger/GodotTools.BuildLogger.csproj
+++ b/modules/mono/editor/GodotTools/GodotTools.BuildLogger/GodotTools.BuildLogger.csproj
@@ -11,6 +11,7 @@
     <AssemblyName>GodotTools.BuildLogger</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <LangVersion>7</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
diff --git a/modules/mono/editor/GodotTools/GodotTools.Core/GodotTools.Core.csproj b/modules/mono/editor/GodotTools/GodotTools.Core/GodotTools.Core.csproj
index f36b40f87c..24c7cb1573 100644
--- a/modules/mono/editor/GodotTools/GodotTools.Core/GodotTools.Core.csproj
+++ b/modules/mono/editor/GodotTools/GodotTools.Core/GodotTools.Core.csproj
@@ -8,6 +8,7 @@
     <RootNamespace>GodotTools.Core</RootNamespace>
     <AssemblyName>GodotTools.Core</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <LangVersion>7</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ConsoleLogger.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ConsoleLogger.cs
new file mode 100644
index 0000000000..7a2ff2ca56
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ConsoleLogger.cs
@@ -0,0 +1,33 @@
+using System;
+
+namespace GodotTools.IdeConnection
+{
+    public class ConsoleLogger : ILogger
+    {
+        public void LogDebug(string message)
+        {
+            Console.WriteLine("DEBUG: " + message);
+        }
+
+        public void LogInfo(string message)
+        {
+            Console.WriteLine("INFO: " + message);
+        }
+
+        public void LogWarning(string message)
+        {
+            Console.WriteLine("WARN: " + message);
+        }
+
+        public void LogError(string message)
+        {
+            Console.WriteLine("ERROR: " + message);
+        }
+
+        public void LogError(string message, Exception e)
+        {
+            Console.WriteLine("EXCEPTION: " + message);
+            Console.WriteLine(e);
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeBase.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeBase.cs
new file mode 100644
index 0000000000..be89638241
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeBase.cs
@@ -0,0 +1,94 @@
+using System;
+using Path = System.IO.Path;
+
+namespace GodotTools.IdeConnection
+{
+    public class GodotIdeBase : IDisposable
+    {
+        private ILogger logger;
+
+        public ILogger Logger
+        {
+            get => logger ?? (logger = new ConsoleLogger());
+            set => logger = value;
+        }
+
+        private readonly string projectMetadataDir;
+
+        protected const string MetaFileName = "ide_server_meta.txt";
+        protected string MetaFilePath => Path.Combine(projectMetadataDir, MetaFileName);
+
+        private GodotIdeConnection connection;
+        protected readonly object ConnectionLock = new object();
+
+        public bool IsDisposed { get; private set; } = false;
+
+        public bool IsConnected => connection != null && !connection.IsDisposed && connection.IsConnected;
+
+        public event Action Connected
+        {
+            add
+            {
+                if (connection != null && !connection.IsDisposed)
+                    connection.Connected += value;
+            }
+            remove
+            {
+                if (connection != null && !connection.IsDisposed)
+                    connection.Connected -= value;
+            }
+        }
+
+        protected GodotIdeConnection Connection
+        {
+            get => connection;
+            set
+            {
+                connection?.Dispose();
+                connection = value;
+            }
+        }
+
+        protected GodotIdeBase(string projectMetadataDir)
+        {
+            this.projectMetadataDir = projectMetadataDir;
+        }
+
+        protected void DisposeConnection()
+        {
+            lock (ConnectionLock)
+            {
+                connection?.Dispose();
+            }
+        }
+
+        ~GodotIdeBase()
+        {
+            Dispose(disposing: false);
+        }
+
+        public void Dispose()
+        {
+            if (IsDisposed)
+                return;
+
+            lock (ConnectionLock)
+            {
+                if (IsDisposed) // lock may not be fair
+                    return;
+                IsDisposed = true;
+            }
+
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                connection?.Dispose();
+            }
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeClient.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeClient.cs
new file mode 100644
index 0000000000..4f56a8d71b
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeClient.cs
@@ -0,0 +1,219 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading;
+
+namespace GodotTools.IdeConnection
+{
+    public abstract class GodotIdeClient : GodotIdeBase
+    {
+        protected GodotIdeMetadata GodotIdeMetadata;
+
+        private readonly FileSystemWatcher fsWatcher;
+
+        protected GodotIdeClient(string projectMetadataDir) : base(projectMetadataDir)
+        {
+            messageHandlers = InitializeMessageHandlers();
+
+            // FileSystemWatcher requires an existing directory
+            if (!File.Exists(projectMetadataDir))
+                Directory.CreateDirectory(projectMetadataDir);
+
+            fsWatcher = new FileSystemWatcher(projectMetadataDir, MetaFileName);
+        }
+
+        private void OnMetaFileChanged(object sender, FileSystemEventArgs e)
+        {
+            if (IsDisposed)
+                return;
+
+            lock (ConnectionLock)
+            {
+                if (IsDisposed)
+                    return;
+
+                if (!File.Exists(MetaFilePath))
+                    return;
+
+                var metadata = ReadMetadataFile();
+
+                if (metadata != null && metadata != GodotIdeMetadata)
+                {
+                    GodotIdeMetadata = metadata.Value;
+                    ConnectToServer();
+                }
+            }
+        }
+
+        private void OnMetaFileDeleted(object sender, FileSystemEventArgs e)
+        {
+            if (IsDisposed)
+                return;
+
+            if (IsConnected)
+                DisposeConnection();
+
+            // The file may have been re-created
+
+            lock (ConnectionLock)
+            {
+                if (IsDisposed)
+                    return;
+
+                if (IsConnected || !File.Exists(MetaFilePath))
+                    return;
+
+                var metadata = ReadMetadataFile();
+
+                if (metadata != null)
+                {
+                    GodotIdeMetadata = metadata.Value;
+                    ConnectToServer();
+                }
+            }
+        }
+
+        private GodotIdeMetadata? ReadMetadataFile()
+        {
+            using (var reader = File.OpenText(MetaFilePath))
+            {
+                string portStr = reader.ReadLine();
+
+                if (portStr == null)
+                    return null;
+
+                string editorExecutablePath = reader.ReadLine();
+
+                if (editorExecutablePath == null)
+                    return null;
+
+                if (!int.TryParse(portStr, out int port))
+                    return null;
+
+                return new GodotIdeMetadata(port, editorExecutablePath);
+            }
+        }
+
+        private void ConnectToServer()
+        {
+            var tcpClient = new TcpClient();
+
+            Connection = new GodotIdeConnectionClient(tcpClient, HandleMessage);
+            Connection.Logger = Logger;
+
+            try
+            {
+                Logger.LogInfo("Connecting to Godot Ide Server");
+                
+                tcpClient.Connect(IPAddress.Loopback, GodotIdeMetadata.Port);
+
+                Logger.LogInfo("Connection open with Godot Ide Server");
+
+                var clientThread = new Thread(Connection.Start)
+                {
+                    IsBackground = true,
+                    Name = "Godot Ide Connection Client"
+                };
+                clientThread.Start();
+            }
+            catch (SocketException e)
+            {
+                if (e.SocketErrorCode == SocketError.ConnectionRefused)
+                    Logger.LogError("The connection to the Godot Ide Server was refused");
+                else
+                    throw;
+            }
+        }
+
+        public void Start()
+        {
+            Logger.LogInfo("Starting Godot Ide Client");
+            
+            fsWatcher.Changed += OnMetaFileChanged;
+            fsWatcher.Deleted += OnMetaFileDeleted;
+            fsWatcher.EnableRaisingEvents = true;
+
+            lock (ConnectionLock)
+            {
+                if (IsDisposed)
+                    return;
+
+                if (!File.Exists(MetaFilePath))
+                {
+                    Logger.LogInfo("There is no Godot Ide Server running");
+                    return;
+                }
+
+                var metadata = ReadMetadataFile();
+
+                if (metadata != null)
+                {
+                    GodotIdeMetadata = metadata.Value;
+                    ConnectToServer();
+                }
+                else
+                {
+                    Logger.LogError("Failed to read Godot Ide metadata file");
+                }
+            }
+        }
+
+        public bool WriteMessage(Message message)
+        {
+            return Connection.WriteMessage(message);
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            if (disposing)
+            {
+                fsWatcher?.Dispose();
+            }
+        }
+
+        protected virtual bool HandleMessage(Message message)
+        {
+            if (messageHandlers.TryGetValue(message.Id, out var action))
+            {
+                action(message.Arguments);
+                return true;
+            }
+
+            return false;
+        }
+
+        private readonly Dictionary<string, Action<string[]>> messageHandlers;
+
+        private Dictionary<string, Action<string[]>> InitializeMessageHandlers()
+        {
+            return new Dictionary<string, Action<string[]>>
+            {
+                ["OpenFile"] = args =>
+                {
+                    switch (args.Length)
+                    {
+                        case 1:
+                            OpenFile(file: args[0]);
+                            return;
+                        case 2:
+                            OpenFile(file: args[0], line: int.Parse(args[1]));
+                            return;
+                        case 3:
+                            OpenFile(file: args[0], line: int.Parse(args[1]), column: int.Parse(args[2]));
+                            return;
+                        default:
+                            throw new ArgumentException();
+                    }
+                }
+            };
+        }
+
+        protected abstract void OpenFile(string file);
+        protected abstract void OpenFile(string file, int line);
+        protected abstract void OpenFile(string file, int line, int column);
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnection.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnection.cs
new file mode 100644
index 0000000000..e7e81f175e
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnection.cs
@@ -0,0 +1,207 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Net.Sockets;
+using System.Text;
+
+namespace GodotTools.IdeConnection
+{
+    public abstract class GodotIdeConnection : IDisposable
+    {
+        protected const string Version = "1.0";
+
+        protected static readonly string ClientHandshake = $"Godot Ide Client Version {Version}";
+        protected static readonly string ServerHandshake = $"Godot Ide Server Version {Version}";
+
+        private const int ClientWriteTimeout = 8000;
+        private readonly TcpClient tcpClient;
+
+        private TextReader clientReader;
+        private TextWriter clientWriter;
+
+        private readonly object writeLock = new object();
+
+        private readonly Func<Message, bool> messageHandler;
+
+        public event Action Connected;
+
+        private ILogger logger;
+
+        public ILogger Logger
+        {
+            get => logger ?? (logger = new ConsoleLogger());
+            set => logger = value;
+        }
+
+        public bool IsDisposed { get; private set; } = false;
+
+        public bool IsConnected => tcpClient.Client != null && tcpClient.Client.Connected;
+
+        protected GodotIdeConnection(TcpClient tcpClient, Func<Message, bool> messageHandler)
+        {
+            this.tcpClient = tcpClient;
+            this.messageHandler = messageHandler;
+        }
+
+        public void Start()
+        {
+            try
+            {
+                if (!StartConnection())
+                    return;
+
+                string messageLine;
+                while ((messageLine = ReadLine()) != null)
+                {
+                    if (!MessageParser.TryParse(messageLine, out Message msg))
+                    {
+                        Logger.LogError($"Received message with invalid format: {messageLine}");
+                        continue;
+                    }
+
+                    Logger.LogDebug($"Received message: {msg}");
+
+                    if (msg.Id == "close")
+                    {
+                        Logger.LogInfo("Closing connection");
+                        return;
+                    }
+
+                    try
+                    {
+                        try
+                        {
+                            Debug.Assert(messageHandler != null);
+
+                            if (!messageHandler(msg))
+                                Logger.LogError($"Received unknown message: {msg}");
+                        }
+                        catch (Exception e)
+                        {
+                            Logger.LogError($"Message handler for '{msg}' failed with exception", e);
+                        }
+                    }
+                    catch (Exception e)
+                    {
+                        Logger.LogError($"Exception thrown from message handler. Message: {msg}", e);
+                    }
+                }
+            }
+            catch (Exception e)
+            {
+                Logger.LogError($"Unhandled exception in the Godot Ide Connection thread", e);
+            }
+            finally
+            {
+                Dispose();
+            }
+        }
+
+        private bool StartConnection()
+        {
+            NetworkStream clientStream = tcpClient.GetStream();
+
+            clientReader = new StreamReader(clientStream, Encoding.UTF8);
+
+            lock (writeLock)
+                clientWriter = new StreamWriter(clientStream, Encoding.UTF8);
+
+            clientStream.WriteTimeout = ClientWriteTimeout;
+
+            if (!WriteHandshake())
+            {
+                Logger.LogError("Could not write handshake");
+                return false;
+            }
+
+            if (!IsValidResponseHandshake(ReadLine()))
+            {
+                Logger.LogError("Received invalid handshake");
+                return false;
+            }
+
+            Connected?.Invoke();
+
+            Logger.LogInfo("Godot Ide connection started");
+
+            return true;
+        }
+
+        private string ReadLine()
+        {
+            try
+            {
+                return clientReader?.ReadLine();
+            }
+            catch (Exception e)
+            {
+                if (IsDisposed)
+                {
+                    var se = e as SocketException ?? e.InnerException as SocketException;
+                    if (se != null && se.SocketErrorCode == SocketError.Interrupted)
+                        return null;
+                }
+
+                throw;
+            }
+        }
+
+        public bool WriteMessage(Message message)
+        {
+            Logger.LogDebug($"Sending message {message}");
+            
+            var messageComposer = new MessageComposer();
+
+            messageComposer.AddArgument(message.Id);
+            foreach (string argument in message.Arguments)
+                messageComposer.AddArgument(argument);
+
+            return WriteLine(messageComposer.ToString());
+        }
+
+        protected bool WriteLine(string text)
+        {
+            if (clientWriter == null || IsDisposed || !IsConnected)
+                return false;
+
+            lock (writeLock)
+            {
+                try
+                {
+                    clientWriter.WriteLine(text);
+                    clientWriter.Flush();
+                }
+                catch (Exception e)
+                {
+                    if (!IsDisposed)
+                    {
+                        var se = e as SocketException ?? e.InnerException as SocketException;
+                        if (se != null && se.SocketErrorCode == SocketError.Shutdown)
+                            Logger.LogInfo("Client disconnected ungracefully");
+                        else
+                            Logger.LogError("Exception thrown when trying to write to client", e);
+
+                        Dispose();
+                    }
+                }
+            }
+
+            return true;
+        }
+
+        protected abstract bool WriteHandshake();
+        protected abstract bool IsValidResponseHandshake(string handshakeLine);
+
+        public void Dispose()
+        {
+            if (IsDisposed)
+                return;
+
+            IsDisposed = true;
+
+            clientReader?.Dispose();
+            clientWriter?.Dispose();
+            ((IDisposable) tcpClient)?.Dispose();
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionClient.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionClient.cs
new file mode 100644
index 0000000000..1b11a14358
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionClient.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Net.Sockets;
+using System.Threading.Tasks;
+
+namespace GodotTools.IdeConnection
+{
+    public class GodotIdeConnectionClient : GodotIdeConnection
+    {
+        public GodotIdeConnectionClient(TcpClient tcpClient, Func<Message, bool> messageHandler)
+            : base(tcpClient, messageHandler)
+        {
+        }
+
+        protected override bool WriteHandshake()
+        {
+            return WriteLine(ClientHandshake);
+        }
+
+        protected override bool IsValidResponseHandshake(string handshakeLine)
+        {
+            return handshakeLine == ServerHandshake;
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionServer.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionServer.cs
new file mode 100644
index 0000000000..aa98dc7ca3
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionServer.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Net.Sockets;
+using System.Threading.Tasks;
+
+namespace GodotTools.IdeConnection
+{
+    public class GodotIdeConnectionServer : GodotIdeConnection
+    {
+        public GodotIdeConnectionServer(TcpClient tcpClient, Func<Message, bool> messageHandler)
+            : base(tcpClient, messageHandler)
+        {
+        }
+
+        protected override bool WriteHandshake()
+        {
+            return WriteLine(ServerHandshake);
+        }
+
+        protected override bool IsValidResponseHandshake(string handshakeLine)
+        {
+            return handshakeLine == ClientHandshake;
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeMetadata.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeMetadata.cs
new file mode 100644
index 0000000000..d16daba0e2
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeMetadata.cs
@@ -0,0 +1,45 @@
+namespace GodotTools.IdeConnection
+{
+    public struct GodotIdeMetadata
+    {
+        public int Port { get; }
+        public string EditorExecutablePath { get; }
+
+        public GodotIdeMetadata(int port, string editorExecutablePath)
+        {
+            Port = port;
+            EditorExecutablePath = editorExecutablePath;
+        }
+
+        public static bool operator ==(GodotIdeMetadata a, GodotIdeMetadata b)
+        {
+            return a.Port == b.Port && a.EditorExecutablePath == b.EditorExecutablePath;
+        }
+
+        public static bool operator !=(GodotIdeMetadata a, GodotIdeMetadata b)
+        {
+            return !(a == b);
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj is GodotIdeMetadata metadata)
+                return metadata == this;
+
+            return false;
+        }
+
+        public bool Equals(GodotIdeMetadata other)
+        {
+            return Port == other.Port && EditorExecutablePath == other.EditorExecutablePath;
+        }
+
+        public override int GetHashCode()
+        {
+            unchecked
+            {
+                return (Port * 397) ^ (EditorExecutablePath != null ? EditorExecutablePath.GetHashCode() : 0);
+            }
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotTools.IdeConnection.csproj b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotTools.IdeConnection.csproj
new file mode 100644
index 0000000000..94e525715b
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotTools.IdeConnection.csproj
@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{92600954-25F0-4291-8E11-1FEE9FC4BE20}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>GodotTools.IdeConnection</RootNamespace>
+    <AssemblyName>GodotTools.IdeConnection</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <LangVersion>7</LangVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>portable</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>portable</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="ConsoleLogger.cs" />
+    <Compile Include="GodotIdeMetadata.cs" />
+    <Compile Include="GodotIdeBase.cs" />
+    <Compile Include="GodotIdeClient.cs" />
+    <Compile Include="GodotIdeConnection.cs" />
+    <Compile Include="GodotIdeConnectionClient.cs" />
+    <Compile Include="GodotIdeConnectionServer.cs" />
+    <Compile Include="ILogger.cs" />
+    <Compile Include="Message.cs" />
+    <Compile Include="MessageComposer.cs" />
+    <Compile Include="MessageParser.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>
\ No newline at end of file
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ILogger.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ILogger.cs
new file mode 100644
index 0000000000..614bb30271
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ILogger.cs
@@ -0,0 +1,13 @@
+using System;
+
+namespace GodotTools.IdeConnection
+{
+    public interface ILogger
+    {
+        void LogDebug(string message);
+        void LogInfo(string message);
+        void LogWarning(string message);
+        void LogError(string message);
+        void LogError(string message, Exception e);
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Message.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Message.cs
new file mode 100644
index 0000000000..f24d324ae3
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Message.cs
@@ -0,0 +1,21 @@
+using System.Linq;
+
+namespace GodotTools.IdeConnection
+{
+    public struct Message
+    {
+        public string Id { get; set; }
+        public string[] Arguments { get; set; }
+
+        public Message(string id, params string[] arguments)
+        {
+            Id = id;
+            Arguments = arguments;
+        }
+
+        public override string ToString()
+        {
+            return $"(Id: '{Id}', Arguments: '{string.Join(",", Arguments)}')";
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageComposer.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageComposer.cs
new file mode 100644
index 0000000000..9e4cd6ec1a
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageComposer.cs
@@ -0,0 +1,46 @@
+using System.Linq;
+using System.Text;
+
+namespace GodotTools.IdeConnection
+{
+    public class MessageComposer
+    {
+        private readonly StringBuilder stringBuilder = new StringBuilder();
+
+        private static readonly char[] CharsToEscape = { '\\', '"' };
+
+        public void AddArgument(string argument)
+        {
+            AddArgument(argument, quoted: argument.Contains(","));
+        }
+
+        public void AddArgument(string argument, bool quoted)
+        {
+            if (stringBuilder.Length > 0)
+                stringBuilder.Append(',');
+
+            if (quoted)
+            {
+                stringBuilder.Append('"');
+                
+                foreach (char @char in argument)
+                {
+                    if (CharsToEscape.Contains(@char))
+                        stringBuilder.Append('\\');
+                    stringBuilder.Append(@char);
+                }
+                
+                stringBuilder.Append('"');
+            }
+            else
+            {
+                stringBuilder.Append(argument);
+            }
+        }
+
+        public override string ToString()
+        {
+            return stringBuilder.ToString();
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageParser.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageParser.cs
new file mode 100644
index 0000000000..ed691e481f
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageParser.cs
@@ -0,0 +1,88 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace GodotTools.IdeConnection
+{
+    public static class MessageParser
+    {
+        public static bool TryParse(string messageLine, out Message message)
+        {
+            var arguments = new List<string>();
+            var stringBuilder = new StringBuilder();
+
+            bool expectingArgument = true;
+
+            for (int i = 0; i < messageLine.Length; i++)
+            {
+                char @char = messageLine[i];
+
+                if (@char == ',')
+                {
+                    if (expectingArgument)
+                        arguments.Add(string.Empty);
+
+                    expectingArgument = true;
+                    continue;
+                }
+
+                bool quoted = false;
+
+                if (messageLine[i] == '"')
+                {
+                    quoted = true;
+                    i++;
+                }
+
+                while (i < messageLine.Length)
+                {
+                    @char = messageLine[i];
+                    
+                    if (quoted && @char == '"')
+                    {
+                        i++;
+                        break;
+                    }
+
+                    if (@char == '\\')
+                    {
+                        i++;
+                        if (i < messageLine.Length)
+                            break;
+
+                        stringBuilder.Append(messageLine[i]);
+                    }
+                    else if (!quoted && @char == ',')
+                    {
+                        break; // We don't increment the counter to allow the colon to be parsed after this
+                    }
+                    else
+                    {
+                        stringBuilder.Append(@char);
+                    }
+                    
+                    i++;
+                }
+                
+                arguments.Add(stringBuilder.ToString());
+                stringBuilder.Clear();
+
+                expectingArgument = false;
+            }
+
+            if (arguments.Count == 0)
+            {
+                message = new Message();
+                return false;
+            }
+
+            message = new Message
+            {
+                Id = arguments[0],
+                Arguments = arguments.Skip(1).ToArray()
+            };
+
+            return true;
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Properties/AssemblyInfo.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000000..c7c00e66a2
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Properties/AssemblyInfo.cs
@@ -0,0 +1,35 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("GodotTools.IdeConnection")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("Godot Engine contributors")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("92600954-25F0-4291-8E11-1FEE9FC4BE20")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/GodotTools.ProjectEditor.csproj b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/GodotTools.ProjectEditor.csproj
index 08b8ba3946..ab3a5d1aea 100644
--- a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/GodotTools.ProjectEditor.csproj
+++ b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/GodotTools.ProjectEditor.csproj
@@ -9,6 +9,7 @@
     <AssemblyName>GodotTools.ProjectEditor</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <BaseIntermediateOutputPath>obj</BaseIntermediateOutputPath>
+    <LangVersion>7</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -36,9 +37,8 @@
       entire solution. $(SolutionDir) is not defined in that case, so we need to workaround that.
       We make SCons restore the NuGet packages in the project directory instead in this case.
       -->
-      <HintPath Condition=" '$(SolutionDir)' != '' ">$(SolutionDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll</HintPath>
-      <HintPath>$(ProjectDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll</HintPath>
-      <HintPath>packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll</HintPath> <!-- Are you happy CI? -->
+      <HintPath Condition=" '$(SolutionDir)' != '' And Exists('$(SolutionDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll') ">$(SolutionDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll</HintPath>
+      <HintPath Condition=" '$(SolutionDir)' == '' Or !Exists('$(SolutionDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll') ">$(ProjectDir)\packages\DotNet.Glob.2.1.1\lib\net45\DotNet.Glob.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ProjectUtils.cs b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ProjectUtils.cs
index 1edc426e00..233aab45b3 100644
--- a/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ProjectUtils.cs
+++ b/modules/mono/editor/GodotTools/GodotTools.ProjectEditor/ProjectUtils.cs
@@ -85,7 +85,7 @@ namespace GodotTools.ProjectEditor
             void AddPropertyIfNotPresent(string name, string condition, string value)
             {
                 if (root.PropertyGroups
-                    .Any(g => g.Condition == string.Empty || g.Condition == condition &&
+                    .Any(g => (g.Condition == string.Empty || g.Condition == condition) &&
                               g.Properties
                                   .Any(p => p.Name == name &&
                                             p.Value == value &&
diff --git a/modules/mono/editor/GodotTools/GodotTools.sln b/modules/mono/editor/GodotTools/GodotTools.sln
index 6f7d44bec2..a3438ea5f3 100644
--- a/modules/mono/editor/GodotTools/GodotTools.sln
+++ b/modules/mono/editor/GodotTools/GodotTools.sln
@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GodotTools.Core", "GodotToo
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GodotTools.BuildLogger", "GodotTools.BuildLogger\GodotTools.BuildLogger.csproj", "{6CE9A984-37B1-4F8A-8FE9-609F05F071B3}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GodotTools.IdeConnection", "GodotTools.IdeConnection\GodotTools.IdeConnection.csproj", "{92600954-25F0-4291-8E11-1FEE9FC4BE20}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -31,5 +33,9 @@ Global
 		{6CE9A984-37B1-4F8A-8FE9-609F05F071B3}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6CE9A984-37B1-4F8A-8FE9-609F05F071B3}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{6CE9A984-37B1-4F8A-8FE9-609F05F071B3}.Release|Any CPU.Build.0 = Release|Any CPU
+		{92600954-25F0-4291-8E11-1FEE9FC4BE20}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{92600954-25F0-4291-8E11-1FEE9FC4BE20}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{92600954-25F0-4291-8E11-1FEE9FC4BE20}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{92600954-25F0-4291-8E11-1FEE9FC4BE20}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal
diff --git a/modules/mono/editor/GodotTools/GodotTools/MonoBottomPanel.cs b/modules/mono/editor/GodotTools/GodotTools/BottomPanel.cs
index 53ff0891d5..44813f962c 100644
--- a/modules/mono/editor/GodotTools/GodotTools/MonoBottomPanel.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/BottomPanel.cs
@@ -9,7 +9,7 @@ using Path = System.IO.Path;
 
 namespace GodotTools
 {
-    public class MonoBottomPanel : VBoxContainer
+    public class BottomPanel : VBoxContainer
     {
         private EditorInterface editorInterface;
 
@@ -34,7 +34,7 @@ namespace GodotTools
 
             for (int i = 0; i < buildTabs.GetChildCount(); i++)
             {
-                var tab = (MonoBuildTab) buildTabs.GetChild(i);
+                var tab = (BuildTab) buildTabs.GetChild(i);
 
                 if (tab == null)
                     continue;
@@ -49,11 +49,11 @@ namespace GodotTools
                 itemTooltip += "\nStatus: ";
 
                 if (tab.BuildExited)
-                    itemTooltip += tab.BuildResult == MonoBuildTab.BuildResults.Success ? "Succeeded" : "Errored";
+                    itemTooltip += tab.BuildResult == BuildTab.BuildResults.Success ? "Succeeded" : "Errored";
                 else
                     itemTooltip += "Running";
 
-                if (!tab.BuildExited || tab.BuildResult == MonoBuildTab.BuildResults.Error)
+                if (!tab.BuildExited || tab.BuildResult == BuildTab.BuildResults.Error)
                     itemTooltip += $"\nErrors: {tab.ErrorCount}";
 
                 itemTooltip += $"\nWarnings: {tab.WarningCount}";
@@ -68,15 +68,15 @@ namespace GodotTools
             }
         }
 
-        public MonoBuildTab GetBuildTabFor(MonoBuildInfo buildInfo)
+        public BuildTab GetBuildTabFor(BuildInfo buildInfo)
         {
-            foreach (var buildTab in new Array<MonoBuildTab>(buildTabs.GetChildren()))
+            foreach (var buildTab in new Array<BuildTab>(buildTabs.GetChildren()))
             {
                 if (buildTab.BuildInfo.Equals(buildInfo))
                     return buildTab;
             }
 
-            var newBuildTab = new MonoBuildTab(buildInfo);
+            var newBuildTab = new BuildTab(buildInfo);
             AddBuildTab(newBuildTab);
 
             return newBuildTab;
@@ -120,7 +120,7 @@ namespace GodotTools
             if (currentTab < 0 || currentTab >= buildTabs.GetTabCount())
                 throw new InvalidOperationException("No tab selected");
 
-            var buildTab = (MonoBuildTab) buildTabs.GetChild(currentTab);
+            var buildTab = (BuildTab) buildTabs.GetChild(currentTab);
             buildTab.WarningsVisible = pressed;
             buildTab.UpdateIssuesList();
         }
@@ -132,7 +132,7 @@ namespace GodotTools
             if (currentTab < 0 || currentTab >= buildTabs.GetTabCount())
                 throw new InvalidOperationException("No tab selected");
 
-            var buildTab = (MonoBuildTab) buildTabs.GetChild(currentTab);
+            var buildTab = (BuildTab) buildTabs.GetChild(currentTab);
             buildTab.ErrorsVisible = pressed;
             buildTab.UpdateIssuesList();
         }
@@ -145,7 +145,7 @@ namespace GodotTools
             string editorScriptsMetadataPath = Path.Combine(GodotSharpDirs.ResMetadataDir, "scripts_metadata.editor");
             string playerScriptsMetadataPath = Path.Combine(GodotSharpDirs.ResMetadataDir, "scripts_metadata.editor_player");
 
-            CSharpProject.GenerateScriptsMetadata(GodotSharpDirs.ProjectCsProjPath, editorScriptsMetadataPath);
+            CsProjOperations.GenerateScriptsMetadata(GodotSharpDirs.ProjectCsProjPath, editorScriptsMetadataPath);
 
             if (File.Exists(editorScriptsMetadataPath))
             {
@@ -166,7 +166,7 @@ namespace GodotTools
                 Internal.GodotIs32Bits() ? "32" : "64"
             };
 
-            bool buildSuccess = GodotSharpBuilds.BuildProjectBlocking("Tools", godotDefines);
+            bool buildSuccess = BuildManager.BuildProjectBlocking("Tools", godotDefines);
 
             if (!buildSuccess)
                 return;
@@ -193,9 +193,9 @@ namespace GodotTools
 
             int selectedItem = selectedItems[0];
 
-            var buildTab = (MonoBuildTab) buildTabs.GetTabControl(selectedItem);
+            var buildTab = (BuildTab) buildTabs.GetTabControl(selectedItem);
 
-            OS.ShellOpen(Path.Combine(buildTab.BuildInfo.LogsDirPath, GodotSharpBuilds.MsBuildLogFileName));
+            OS.ShellOpen(Path.Combine(buildTab.BuildInfo.LogsDirPath, BuildManager.MsBuildLogFileName));
         }
 
         public override void _Notification(int what)
@@ -211,13 +211,13 @@ namespace GodotTools
             }
         }
 
-        public void AddBuildTab(MonoBuildTab buildTab)
+        public void AddBuildTab(BuildTab buildTab)
         {
             buildTabs.AddChild(buildTab);
             RaiseBuildTab(buildTab);
         }
 
-        public void RaiseBuildTab(MonoBuildTab buildTab)
+        public void RaiseBuildTab(BuildTab buildTab)
         {
             if (buildTab.GetParent() != buildTabs)
                 throw new InvalidOperationException("Build tab is not in the tabs list");
diff --git a/modules/mono/editor/GodotTools/GodotTools/Build/BuildSystem.cs b/modules/mono/editor/GodotTools/GodotTools/Build/BuildSystem.cs
index f849356919..9a2b2e3a26 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Build/BuildSystem.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Build/BuildSystem.cs
@@ -46,8 +46,8 @@ namespace GodotTools.Build
             {
                 if (OS.IsWindows())
                 {
-                    return (GodotSharpBuilds.BuildTool) EditorSettings.GetSetting("mono/builds/build_tool")
-                           == GodotSharpBuilds.BuildTool.MsBuildMono;
+                    return (BuildManager.BuildTool) EditorSettings.GetSetting("mono/builds/build_tool")
+                           == BuildManager.BuildTool.MsBuildMono;
                 }
 
                 return false;
@@ -103,16 +103,16 @@ namespace GodotTools.Build
             return process;
         }
 
-        public static int Build(MonoBuildInfo monoBuildInfo)
+        public static int Build(BuildInfo buildInfo)
         {
-            return Build(monoBuildInfo.Solution, monoBuildInfo.Configuration,
-                monoBuildInfo.LogsDirPath, monoBuildInfo.CustomProperties);
+            return Build(buildInfo.Solution, buildInfo.Configuration,
+                buildInfo.LogsDirPath, buildInfo.CustomProperties);
         }
 
-        public static async Task<int> BuildAsync(MonoBuildInfo monoBuildInfo)
+        public static async Task<int> BuildAsync(BuildInfo buildInfo)
         {
-            return await BuildAsync(monoBuildInfo.Solution, monoBuildInfo.Configuration,
-                monoBuildInfo.LogsDirPath, monoBuildInfo.CustomProperties);
+            return await BuildAsync(buildInfo.Solution, buildInfo.Configuration,
+                buildInfo.LogsDirPath, buildInfo.CustomProperties);
         }
 
         public static int Build(string solution, string config, string loggerOutputDir, IEnumerable<string> customProperties = null)
@@ -137,7 +137,7 @@ namespace GodotTools.Build
 
         private static string BuildArguments(string solution, string config, string loggerOutputDir, List<string> customProperties)
         {
-            string arguments = $@"""{solution}"" /v:normal /t:Rebuild ""/p:{"Configuration=" + config}"" " +
+            string arguments = $@"""{solution}"" /v:normal /t:Build ""/p:{"Configuration=" + config}"" " +
                                $@"""/l:{typeof(GodotBuildLogger).FullName},{GodotBuildLogger.AssemblyPath};{loggerOutputDir}""";
 
             foreach (string customProperty in customProperties)
diff --git a/modules/mono/editor/GodotTools/GodotTools/Build/MsBuildFinder.cs b/modules/mono/editor/GodotTools/GodotTools/Build/MsBuildFinder.cs
index f0068385f4..4c1e47ecad 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Build/MsBuildFinder.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Build/MsBuildFinder.cs
@@ -15,18 +15,17 @@ namespace GodotTools.Build
     {
         private static string _msbuildToolsPath = string.Empty;
         private static string _msbuildUnixPath = string.Empty;
-        private static string _xbuildUnixPath = string.Empty;
 
         public static string FindMsBuild()
         {
             var editorSettings = GodotSharpEditor.Instance.GetEditorInterface().GetEditorSettings();
-            var buildTool = (GodotSharpBuilds.BuildTool) editorSettings.GetSetting("mono/builds/build_tool");
+            var buildTool = (BuildManager.BuildTool) editorSettings.GetSetting("mono/builds/build_tool");
 
             if (OS.IsWindows())
             {
                 switch (buildTool)
                 {
-                    case GodotSharpBuilds.BuildTool.MsBuildVs:
+                    case BuildManager.BuildTool.MsBuildVs:
                     {
                         if (_msbuildToolsPath.Empty() || !File.Exists(_msbuildToolsPath))
                         {
@@ -35,7 +34,7 @@ namespace GodotTools.Build
 
                             if (_msbuildToolsPath.Empty())
                             {
-                                throw new FileNotFoundException($"Cannot find executable for '{GodotSharpBuilds.PropNameMsbuildVs}'. Tried with path: {_msbuildToolsPath}");
+                                throw new FileNotFoundException($"Cannot find executable for '{BuildManager.PropNameMsbuildVs}'. Tried with path: {_msbuildToolsPath}");
                             }
                         }
 
@@ -44,31 +43,17 @@ namespace GodotTools.Build
 
                         return Path.Combine(_msbuildToolsPath, "MSBuild.exe");
                     }
-
-                    case GodotSharpBuilds.BuildTool.MsBuildMono:
+                    case BuildManager.BuildTool.MsBuildMono:
                     {
                         string msbuildPath = Path.Combine(Internal.MonoWindowsInstallRoot, "bin", "msbuild.bat");
 
                         if (!File.Exists(msbuildPath))
                         {
-                            throw new FileNotFoundException($"Cannot find executable for '{GodotSharpBuilds.PropNameMsbuildMono}'. Tried with path: {msbuildPath}");
+                            throw new FileNotFoundException($"Cannot find executable for '{BuildManager.PropNameMsbuildMono}'. Tried with path: {msbuildPath}");
                         }
 
                         return msbuildPath;
                     }
-
-                    case GodotSharpBuilds.BuildTool.XBuild:
-                    {
-                        string xbuildPath = Path.Combine(Internal.MonoWindowsInstallRoot, "bin", "xbuild.bat");
-
-                        if (!File.Exists(xbuildPath))
-                        {
-                            throw new FileNotFoundException($"Cannot find executable for '{GodotSharpBuilds.PropNameXbuild}'. Tried with path: {xbuildPath}");
-                        }
-
-                        return xbuildPath;
-                    }
-
                     default:
                         throw new IndexOutOfRangeException("Invalid build tool in editor settings");
                 }
@@ -76,20 +61,7 @@ namespace GodotTools.Build
 
             if (OS.IsUnix())
             {
-                if (buildTool == GodotSharpBuilds.BuildTool.XBuild)
-                {
-                    if (_xbuildUnixPath.Empty() || !File.Exists(_xbuildUnixPath))
-                    {
-                        // Try to search it again if it wasn't found last time or if it was removed from its location
-                        _xbuildUnixPath = FindBuildEngineOnUnix("msbuild");
-                    }
-
-                    if (_xbuildUnixPath.Empty())
-                    {
-                        throw new FileNotFoundException($"Cannot find binary for '{GodotSharpBuilds.PropNameXbuild}'");
-                    }
-                }
-                else
+                if (buildTool == BuildManager.BuildTool.MsBuildMono)
                 {
                     if (_msbuildUnixPath.Empty() || !File.Exists(_msbuildUnixPath))
                     {
@@ -99,11 +71,15 @@ namespace GodotTools.Build
 
                     if (_msbuildUnixPath.Empty())
                     {
-                        throw new FileNotFoundException($"Cannot find binary for '{GodotSharpBuilds.PropNameMsbuildMono}'");
+                        throw new FileNotFoundException($"Cannot find binary for '{BuildManager.PropNameMsbuildMono}'");
                     }
-                }
 
-                return buildTool != GodotSharpBuilds.BuildTool.XBuild ? _msbuildUnixPath : _xbuildUnixPath;
+                    return _msbuildUnixPath;
+                }
+                else
+                {
+                    throw new IndexOutOfRangeException("Invalid build tool in editor settings");
+                }
             }
 
             throw new PlatformNotSupportedException();
diff --git a/modules/mono/editor/GodotTools/GodotTools/MonoBuildInfo.cs b/modules/mono/editor/GodotTools/GodotTools/BuildInfo.cs
index 858e852392..70bd552f2f 100644
--- a/modules/mono/editor/GodotTools/GodotTools/MonoBuildInfo.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/BuildInfo.cs
@@ -7,7 +7,7 @@ using Path = System.IO.Path;
 namespace GodotTools
 {
     [Serializable]
-    public sealed class MonoBuildInfo : Reference // TODO Remove Reference once we have proper serialization
+    public sealed class BuildInfo : Reference // TODO Remove Reference once we have proper serialization
     {
         public string Solution { get; }
         public string Configuration { get; }
@@ -17,7 +17,7 @@ namespace GodotTools
 
         public override bool Equals(object obj)
         {
-            if (obj is MonoBuildInfo other)
+            if (obj is BuildInfo other)
                 return other.Solution == Solution && other.Configuration == Configuration;
 
             return false;
@@ -34,11 +34,11 @@ namespace GodotTools
             }
         }
 
-        private MonoBuildInfo()
+        private BuildInfo()
         {
         }
 
-        public MonoBuildInfo(string solution, string configuration)
+        public BuildInfo(string solution, string configuration)
         {
             Solution = solution;
             Configuration = configuration;
diff --git a/modules/mono/editor/GodotTools/GodotTools/GodotSharpBuilds.cs b/modules/mono/editor/GodotTools/GodotTools/BuildManager.cs
index a884b0ead0..417032da54 100644
--- a/modules/mono/editor/GodotTools/GodotTools/GodotSharpBuilds.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/BuildManager.cs
@@ -6,19 +6,16 @@ using GodotTools.Build;
 using GodotTools.Internals;
 using GodotTools.Utils;
 using static GodotTools.Internals.Globals;
-using Error = Godot.Error;
 using File = GodotTools.Utils.File;
-using Directory = GodotTools.Utils.Directory;
 
 namespace GodotTools
 {
-    public static class GodotSharpBuilds
+    public static class BuildManager
     {
-        private static readonly List<MonoBuildInfo> BuildsInProgress = new List<MonoBuildInfo>();
+        private static readonly List<BuildInfo> BuildsInProgress = new List<BuildInfo>();
 
         public const string PropNameMsbuildMono = "MSBuild (Mono)";
         public const string PropNameMsbuildVs = "MSBuild (VS Build Tools)";
-        public const string PropNameXbuild = "xbuild (Deprecated)";
 
         public const string MsBuildIssuesFileName = "msbuild_issues.csv";
         public const string MsBuildLogFileName = "msbuild_log.txt";
@@ -26,11 +23,10 @@ namespace GodotTools
         public enum BuildTool
         {
             MsBuildMono,
-            MsBuildVs,
-            XBuild // Deprecated
+            MsBuildVs
         }
 
-        private static void RemoveOldIssuesFile(MonoBuildInfo buildInfo)
+        private static void RemoveOldIssuesFile(BuildInfo buildInfo)
         {
             var issuesFile = GetIssuesFilePath(buildInfo);
 
@@ -40,31 +36,23 @@ namespace GodotTools
             File.Delete(issuesFile);
         }
 
-        private static string _ApiFolderName(ApiAssemblyType apiType)
-        {
-            ulong apiHash = apiType == ApiAssemblyType.Core ?
-                Internal.GetCoreApiHash() :
-                Internal.GetEditorApiHash();
-            return $"{apiHash}_{BindingsGenerator.Version}_{BindingsGenerator.CsGlueVersion}";
-        }
-
         private static void ShowBuildErrorDialog(string message)
         {
             GodotSharpEditor.Instance.ShowErrorDialog(message, "Build error");
-            GodotSharpEditor.Instance.MonoBottomPanel.ShowBuildTab();
+            GodotSharpEditor.Instance.BottomPanel.ShowBuildTab();
         }
 
-        public static void RestartBuild(MonoBuildTab buildTab) => throw new NotImplementedException();
-        public static void StopBuild(MonoBuildTab buildTab) => throw new NotImplementedException();
+        public static void RestartBuild(BuildTab buildTab) => throw new NotImplementedException();
+        public static void StopBuild(BuildTab buildTab) => throw new NotImplementedException();
 
-        private static string GetLogFilePath(MonoBuildInfo buildInfo)
+        private static string GetLogFilePath(BuildInfo buildInfo)
         {
             return Path.Combine(buildInfo.LogsDirPath, MsBuildLogFileName);
         }
 
-        private static string GetIssuesFilePath(MonoBuildInfo buildInfo)
+        private static string GetIssuesFilePath(BuildInfo buildInfo)
         {
-            return Path.Combine(Godot.ProjectSettings.LocalizePath(buildInfo.LogsDirPath), MsBuildIssuesFileName);
+            return Path.Combine(buildInfo.LogsDirPath, MsBuildIssuesFileName);
         }
 
         private static void PrintVerbose(string text)
@@ -73,7 +61,7 @@ namespace GodotTools
                 Godot.GD.Print(text);
         }
 
-        public static bool Build(MonoBuildInfo buildInfo)
+        public static bool Build(BuildInfo buildInfo)
         {
             if (BuildsInProgress.Contains(buildInfo))
                 throw new InvalidOperationException("A build is already in progress");
@@ -82,7 +70,7 @@ namespace GodotTools
 
             try
             {
-                MonoBuildTab buildTab = GodotSharpEditor.Instance.MonoBottomPanel.GetBuildTabFor(buildInfo);
+                BuildTab buildTab = GodotSharpEditor.Instance.BottomPanel.GetBuildTabFor(buildInfo);
                 buildTab.OnBuildStart();
 
                 // Required in order to update the build tasks list
@@ -105,7 +93,7 @@ namespace GodotTools
                     if (exitCode != 0)
                         PrintVerbose($"MSBuild exited with code: {exitCode}. Log file: {GetLogFilePath(buildInfo)}");
 
-                    buildTab.OnBuildExit(exitCode == 0 ? MonoBuildTab.BuildResults.Success : MonoBuildTab.BuildResults.Error);
+                    buildTab.OnBuildExit(exitCode == 0 ? BuildTab.BuildResults.Success : BuildTab.BuildResults.Error);
 
                     return exitCode == 0;
                 }
@@ -122,7 +110,7 @@ namespace GodotTools
             }
         }
 
-        public static async Task<bool> BuildAsync(MonoBuildInfo buildInfo)
+        public static async Task<bool> BuildAsync(BuildInfo buildInfo)
         {
             if (BuildsInProgress.Contains(buildInfo))
                 throw new InvalidOperationException("A build is already in progress");
@@ -131,7 +119,7 @@ namespace GodotTools
 
             try
             {
-                MonoBuildTab buildTab = GodotSharpEditor.Instance.MonoBottomPanel.GetBuildTabFor(buildInfo);
+                BuildTab buildTab = GodotSharpEditor.Instance.BottomPanel.GetBuildTabFor(buildInfo);
 
                 try
                 {
@@ -150,7 +138,7 @@ namespace GodotTools
                     if (exitCode != 0)
                         PrintVerbose($"MSBuild exited with code: {exitCode}. Log file: {GetLogFilePath(buildInfo)}");
 
-                    buildTab.OnBuildExit(exitCode == 0 ? MonoBuildTab.BuildResults.Success : MonoBuildTab.BuildResults.Error);
+                    buildTab.OnBuildExit(exitCode == 0 ? BuildTab.BuildResults.Success : BuildTab.BuildResults.Error);
 
                     return exitCode == 0;
                 }
@@ -167,32 +155,6 @@ namespace GodotTools
             }
         }
 
-        public static bool BuildApiSolution(string apiSlnDir, string config)
-        {
-            string apiSlnFile = Path.Combine(apiSlnDir, $"{ApiAssemblyNames.SolutionName}.sln");
-
-            string coreApiAssemblyDir = Path.Combine(apiSlnDir, ApiAssemblyNames.Core, "bin", config);
-            string coreApiAssemblyFile = Path.Combine(coreApiAssemblyDir, $"{ApiAssemblyNames.Core}.dll");
-
-            string editorApiAssemblyDir = Path.Combine(apiSlnDir, ApiAssemblyNames.Editor, "bin", config);
-            string editorApiAssemblyFile = Path.Combine(editorApiAssemblyDir, $"{ApiAssemblyNames.Editor}.dll");
-
-            if (File.Exists(coreApiAssemblyFile) && File.Exists(editorApiAssemblyFile))
-                return true; // The assemblies are in the output folder; assume the solution is already built
-
-            var apiBuildInfo = new MonoBuildInfo(apiSlnFile, config);
-
-            // TODO Replace this global NoWarn with '#pragma warning' directives on generated files,
-            // once we start to actively document manually maintained C# classes
-            apiBuildInfo.CustomProperties.Add("NoWarn=1591"); // Ignore missing documentation warnings
-
-            if (Build(apiBuildInfo))
-                return true;
-
-            ShowBuildErrorDialog($"Failed to build {ApiAssemblyNames.SolutionName} solution.");
-            return false;
-        }
-
         public static bool BuildProjectBlocking(string config, IEnumerable<string> godotDefines)
         {
             if (!File.Exists(GodotSharpDirs.ProjectSlnPath))
@@ -202,14 +164,17 @@ namespace GodotTools
             // case the user decided to delete them at some point after they were loaded.
             Internal.UpdateApiAssembliesFromPrebuilt();
 
+            var editorSettings = GodotSharpEditor.Instance.GetEditorInterface().GetEditorSettings();
+            var buildTool = (BuildTool) editorSettings.GetSetting("mono/builds/build_tool");
+
             using (var pr = new EditorProgress("mono_project_debug_build", "Building project solution...", 1))
             {
                 pr.Step("Building project solution", 0);
 
-                var buildInfo = new MonoBuildInfo(GodotSharpDirs.ProjectSlnPath, config);
+                var buildInfo = new BuildInfo(GodotSharpDirs.ProjectSlnPath, config);
 
                 // Add Godot defines
-                string constants = OS.IsWindows() ? "GodotDefineConstants=\"" : "GodotDefineConstants=\\\"";
+                string constants = buildTool == BuildTool.MsBuildVs ? "GodotDefineConstants=\"" : "GodotDefineConstants=\\\"";
 
                 foreach (var godotDefine in godotDefines)
                     constants += $"GODOT_{godotDefine.ToUpper().Replace("-", "_").Replace(" ", "_").Replace(";", "_")};";
@@ -217,7 +182,7 @@ namespace GodotTools
                 if (Internal.GodotIsRealTDouble())
                     constants += "GODOT_REAL_T_IS_DOUBLE;";
 
-                constants += OS.IsWindows() ? "\"" : "\\\"";
+                constants += buildTool == BuildTool.MsBuildVs ? "\"" : "\\\"";
 
                 buildInfo.CustomProperties.Add(constants);
 
@@ -239,11 +204,28 @@ namespace GodotTools
             string editorScriptsMetadataPath = Path.Combine(GodotSharpDirs.ResMetadataDir, "scripts_metadata.editor");
             string playerScriptsMetadataPath = Path.Combine(GodotSharpDirs.ResMetadataDir, "scripts_metadata.editor_player");
 
-            CSharpProject.GenerateScriptsMetadata(GodotSharpDirs.ProjectCsProjPath, editorScriptsMetadataPath);
+            CsProjOperations.GenerateScriptsMetadata(GodotSharpDirs.ProjectCsProjPath, editorScriptsMetadataPath);
 
             if (File.Exists(editorScriptsMetadataPath))
                 File.Copy(editorScriptsMetadataPath, playerScriptsMetadataPath);
 
+            var currentPlayRequest = GodotSharpEditor.Instance.GodotIdeManager.GodotIdeServer.CurrentPlayRequest;
+
+            if (currentPlayRequest != null)
+            {
+                if (currentPlayRequest.Value.HasDebugger)
+                {
+                    // Set the environment variable that will tell the player to connect to the IDE debugger
+                    // TODO: We should probably add a better way to do this
+                    Environment.SetEnvironmentVariable("GODOT_MONO_DEBUGGER_AGENT",
+                        "--debugger-agent=transport=dt_socket" +
+                        $",address={currentPlayRequest.Value.DebuggerHost}:{currentPlayRequest.Value.DebuggerPort}" +
+                        ",server=n");
+                }
+
+                return true; // Requested play from an external editor/IDE which already built the project
+            }
+
             var godotDefines = new[]
             {
                 Godot.OS.GetName(),
@@ -267,8 +249,8 @@ namespace GodotTools
                 ["name"] = "mono/builds/build_tool",
                 ["hint"] = Godot.PropertyHint.Enum,
                 ["hint_string"] = OS.IsWindows() ?
-                    $"{PropNameMsbuildMono},{PropNameMsbuildVs},{PropNameXbuild}" :
-                    $"{PropNameMsbuildMono},{PropNameXbuild}"
+                    $"{PropNameMsbuildMono},{PropNameMsbuildVs}" :
+                    $"{PropNameMsbuildMono}"
             });
 
             EditorDef("mono/builds/print_build_output", false);
diff --git a/modules/mono/editor/GodotTools/GodotTools/MonoBuildTab.cs b/modules/mono/editor/GodotTools/GodotTools/BuildTab.cs
index 75fdacc0da..807a20d9a1 100644
--- a/modules/mono/editor/GodotTools/GodotTools/MonoBuildTab.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/BuildTab.cs
@@ -7,7 +7,7 @@ using Path = System.IO.Path;
 
 namespace GodotTools
 {
-    public class MonoBuildTab : VBoxContainer
+    public class BuildTab : VBoxContainer
     {
         public enum BuildResults
         {
@@ -55,47 +55,54 @@ namespace GodotTools
             }
         }
 
-        public MonoBuildInfo BuildInfo { get; private set; }
+        public BuildInfo BuildInfo { get; private set; }
 
         private void _LoadIssuesFromFile(string csvFile)
         {
             using (var file = new Godot.File())
             {
-                Error openError = file.Open(csvFile, Godot.File.ModeFlags.Read);
-
-                if (openError != Error.Ok)
-                    return;
-
-                while (!file.EofReached())
+                try
                 {
-                    string[] csvColumns = file.GetCsvLine();
+                    Error openError = file.Open(csvFile, Godot.File.ModeFlags.Read);
 
-                    if (csvColumns.Length == 1 && csvColumns[0].Empty())
+                    if (openError != Error.Ok)
                         return;
 
-                    if (csvColumns.Length != 7)
+                    while (!file.EofReached())
                     {
-                        GD.PushError($"Expected 7 columns, got {csvColumns.Length}");
-                        continue;
+                        string[] csvColumns = file.GetCsvLine();
+
+                        if (csvColumns.Length == 1 && csvColumns[0].Empty())
+                            return;
+
+                        if (csvColumns.Length != 7)
+                        {
+                            GD.PushError($"Expected 7 columns, got {csvColumns.Length}");
+                            continue;
+                        }
+
+                        var issue = new BuildIssue
+                        {
+                            Warning = csvColumns[0] == "warning",
+                            File = csvColumns[1],
+                            Line = int.Parse(csvColumns[2]),
+                            Column = int.Parse(csvColumns[3]),
+                            Code = csvColumns[4],
+                            Message = csvColumns[5],
+                            ProjectFile = csvColumns[6]
+                        };
+
+                        if (issue.Warning)
+                            WarningCount += 1;
+                        else
+                            ErrorCount += 1;
+
+                        issues.Add(issue);
                     }
-
-                    var issue = new BuildIssue
-                    {
-                        Warning = csvColumns[0] == "warning",
-                        File = csvColumns[1],
-                        Line = int.Parse(csvColumns[2]),
-                        Column = int.Parse(csvColumns[3]),
-                        Code = csvColumns[4],
-                        Message = csvColumns[5],
-                        ProjectFile = csvColumns[6]
-                    };
-
-                    if (issue.Warning)
-                        WarningCount += 1;
-                    else
-                        ErrorCount += 1;
-
-                    issues.Add(issue);
+                }
+                finally
+                {
+                    file.Close(); // Disposing it is not enough. We need to call Close()
                 }
             }
         }
@@ -192,7 +199,7 @@ namespace GodotTools
             ErrorCount = 0;
             UpdateIssuesList();
 
-            GodotSharpEditor.Instance.MonoBottomPanel.RaiseBuildTab(this);
+            GodotSharpEditor.Instance.BottomPanel.RaiseBuildTab(this);
         }
 
         public void OnBuildExit(BuildResults result)
@@ -200,10 +207,10 @@ namespace GodotTools
             BuildExited = true;
             BuildResult = result;
 
-            _LoadIssuesFromFile(Path.Combine(BuildInfo.LogsDirPath, GodotSharpBuilds.MsBuildIssuesFileName));
+            _LoadIssuesFromFile(Path.Combine(BuildInfo.LogsDirPath, BuildManager.MsBuildIssuesFileName));
             UpdateIssuesList();
 
-            GodotSharpEditor.Instance.MonoBottomPanel.RaiseBuildTab(this);
+            GodotSharpEditor.Instance.BottomPanel.RaiseBuildTab(this);
         }
 
         public void OnBuildExecFailed(string cause)
@@ -220,7 +227,7 @@ namespace GodotTools
 
             UpdateIssuesList();
 
-            GodotSharpEditor.Instance.MonoBottomPanel.RaiseBuildTab(this);
+            GodotSharpEditor.Instance.BottomPanel.RaiseBuildTab(this);
         }
 
         public void RestartBuild()
@@ -228,7 +235,7 @@ namespace GodotTools
             if (!BuildExited)
                 throw new InvalidOperationException("Build already started");
 
-            GodotSharpBuilds.RestartBuild(this);
+            BuildManager.RestartBuild(this);
         }
 
         public void StopBuild()
@@ -236,7 +243,7 @@ namespace GodotTools
             if (!BuildExited)
                 throw new InvalidOperationException("Build is not in progress");
 
-            GodotSharpBuilds.StopBuild(this);
+            BuildManager.StopBuild(this);
         }
 
         public override void _Ready()
@@ -248,11 +255,11 @@ namespace GodotTools
             AddChild(issuesList);
         }
 
-        private MonoBuildTab()
+        private BuildTab()
         {
         }
 
-        public MonoBuildTab(MonoBuildInfo buildInfo)
+        public BuildTab(BuildInfo buildInfo)
         {
             BuildInfo = buildInfo;
         }
diff --git a/modules/mono/editor/GodotTools/GodotTools/CSharpProject.cs b/modules/mono/editor/GodotTools/GodotTools/CsProjOperations.cs
index 4535ed7247..c021a9051e 100644
--- a/modules/mono/editor/GodotTools/GodotTools/CSharpProject.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/CsProjOperations.cs
@@ -9,7 +9,7 @@ using Directory = GodotTools.Utils.Directory;
 
 namespace GodotTools
 {
-    public static class CSharpProject
+    public static class CsProjOperations
     {
         public static string GenerateGameProject(string dir, string name)
         {
diff --git a/modules/mono/editor/GodotTools/GodotTools/ExternalEditorId.cs b/modules/mono/editor/GodotTools/GodotTools/ExternalEditorId.cs
new file mode 100644
index 0000000000..4312ca0230
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools/ExternalEditorId.cs
@@ -0,0 +1,11 @@
+namespace GodotTools
+{
+    public enum ExternalEditorId
+    {
+        None,
+        VisualStudio, // TODO (Windows-only)
+        VisualStudioForMac, // Mac-only
+        MonoDevelop,
+        VsCode
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools/GodotSharpEditor.cs b/modules/mono/editor/GodotTools/GodotTools/GodotSharpEditor.cs
index 90dec43412..7da7cff933 100644
--- a/modules/mono/editor/GodotTools/GodotTools/GodotSharpEditor.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/GodotSharpEditor.cs
@@ -2,16 +2,18 @@ using Godot;
 using GodotTools.Utils;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
+using GodotTools.Ides;
 using GodotTools.Internals;
 using GodotTools.ProjectEditor;
 using static GodotTools.Internals.Globals;
 using File = GodotTools.Utils.File;
-using Path = System.IO.Path;
 using OS = GodotTools.Utils.OS;
 
 namespace GodotTools
 {
+    [SuppressMessage("ReSharper", "ClassNeverInstantiated.Global")]
     public class GodotSharpEditor : EditorPlugin, ISerializationListener
     {
         private EditorSettings editorSettings;
@@ -24,12 +26,11 @@ namespace GodotTools
 
         private ToolButton bottomPanelBtn;
 
-        private MonoDevelopInstance monoDevelopInstance;
-        private MonoDevelopInstance visualStudioForMacInstance;
+        public GodotIdeManager GodotIdeManager { get; private set; }
 
         private WeakRef exportPluginWeak; // TODO Use WeakReference once we have proper serialization
 
-        public MonoBottomPanel MonoBottomPanel { get; private set; }
+        public BottomPanel BottomPanel { get; private set; }
 
         private bool CreateProjectSolution()
         {
@@ -44,7 +45,7 @@ namespace GodotTools
                 if (name.Empty())
                     name = "UnnamedProject";
 
-                string guid = CSharpProject.GenerateGameProject(path, name);
+                string guid = CsProjOperations.GenerateGameProject(path, name);
 
                 if (guid.Length > 0)
                 {
@@ -133,7 +134,7 @@ namespace GodotTools
                     return; // Failed to create solution
             }
 
-            Instance.MonoBottomPanel.BuildProjectPressed();
+            Instance.BottomPanel.BuildProjectPressed();
         }
 
         public override void _Notification(int what)
@@ -153,21 +154,12 @@ namespace GodotTools
             }
         }
 
-        public enum MenuOptions
+        private enum MenuOptions
         {
             CreateSln,
             AboutCSharp,
         }
 
-        public enum ExternalEditor
-        {
-            None,
-            VisualStudio, // TODO (Windows-only)
-            VisualStudioForMac, // Mac-only
-            MonoDevelop,
-            VsCode
-        }
-
         public void ShowErrorDialog(string message, string title = "Error")
         {
             errorDialog.WindowTitle = title;
@@ -184,11 +176,30 @@ namespace GodotTools
 
         public Error OpenInExternalEditor(Script script, int line, int col)
         {
-            var editor = (ExternalEditor) editorSettings.GetSetting("mono/editor/external_editor");
+            var editor = (ExternalEditorId) editorSettings.GetSetting("mono/editor/external_editor");
 
             switch (editor)
             {
-                case ExternalEditor.VsCode:
+                case ExternalEditorId.None:
+                    // Tells the caller to fallback to the global external editor settings or the built-in editor
+                    return Error.Unavailable;
+                case ExternalEditorId.VisualStudio:
+                    throw new NotSupportedException();
+                case ExternalEditorId.VisualStudioForMac:
+                    goto case ExternalEditorId.MonoDevelop;
+                case ExternalEditorId.MonoDevelop:
+                {
+                    string scriptPath = ProjectSettings.GlobalizePath(script.ResourcePath);
+
+                    if (line >= 0)
+                        GodotIdeManager.SendOpenFile(scriptPath, line + 1, col);
+                    else
+                        GodotIdeManager.SendOpenFile(scriptPath);
+
+                    break;
+                }
+
+                case ExternalEditorId.VsCode:
                 {
                     if (_vsCodePath.Empty() || !File.Exists(_vsCodePath))
                     {
@@ -273,38 +284,6 @@ namespace GodotTools
                     break;
                 }
 
-                case ExternalEditor.VisualStudioForMac:
-                    goto case ExternalEditor.MonoDevelop;
-                case ExternalEditor.MonoDevelop:
-                {
-                    MonoDevelopInstance GetMonoDevelopInstance(string solutionPath)
-                    {
-                        if (OS.IsOSX() && editor == ExternalEditor.VisualStudioForMac)
-                        {
-                            if (visualStudioForMacInstance == null)
-                                visualStudioForMacInstance = new MonoDevelopInstance(solutionPath, MonoDevelopInstance.EditorId.VisualStudioForMac);
-
-                            return visualStudioForMacInstance;
-                        }
-
-                        if (monoDevelopInstance == null)
-                            monoDevelopInstance = new MonoDevelopInstance(solutionPath, MonoDevelopInstance.EditorId.MonoDevelop);
-
-                        return monoDevelopInstance;
-                    }
-
-                    string scriptPath = ProjectSettings.GlobalizePath(script.ResourcePath);
-
-                    if (line >= 0)
-                        scriptPath += $";{line + 1};{col}";
-
-                    GetMonoDevelopInstance(GodotSharpDirs.ProjectSlnPath).Execute(scriptPath);
-
-                    break;
-                }
-
-                case ExternalEditor.None:
-                    return Error.Unavailable;
                 default:
                     throw new ArgumentOutOfRangeException();
             }
@@ -314,12 +293,12 @@ namespace GodotTools
 
         public bool OverridesExternalEditor()
         {
-            return (ExternalEditor) editorSettings.GetSetting("mono/editor/external_editor") != ExternalEditor.None;
+            return (ExternalEditorId) editorSettings.GetSetting("mono/editor/external_editor") != ExternalEditorId.None;
         }
 
         public override bool Build()
         {
-            return GodotSharpBuilds.EditorBuildCallback();
+            return BuildManager.EditorBuildCallback();
         }
 
         public override void EnablePlugin()
@@ -338,9 +317,9 @@ namespace GodotTools
             errorDialog = new AcceptDialog();
             editorBaseControl.AddChild(errorDialog);
 
-            MonoBottomPanel = new MonoBottomPanel();
+            BottomPanel = new BottomPanel();
 
-            bottomPanelBtn = AddControlToBottomPanel(MonoBottomPanel, "Mono".TTR());
+            bottomPanelBtn = AddControlToBottomPanel(BottomPanel, "Mono".TTR());
 
             AddChild(new HotReloadAssemblyWatcher {Name = "HotReloadAssemblyWatcher"});
 
@@ -380,7 +359,7 @@ namespace GodotTools
                 aboutLabel.Text =
                     "C# support in Godot Engine is in late alpha stage and, while already usable, " +
                     "it is not meant for use in production.\n\n" +
-                    "Projects can be exported to Linux, macOS and Windows, but not yet to mobile or web platforms. " +
+                    "Projects can be exported to Linux, macOS, Windows and Android, but not yet to iOS, HTML5 or UWP. " +
                     "Bugs and usability issues will be addressed gradually over future releases, " +
                     "potentially including compatibility breaking changes as new features are implemented for a better overall C# experience.\n\n" +
                     "If you experience issues with this Mono build, please report them on Godot's issue tracker with details about your system, MSBuild version, IDE, etc.:\n\n" +
@@ -398,7 +377,7 @@ namespace GodotTools
             if (File.Exists(GodotSharpDirs.ProjectSlnPath) && File.Exists(GodotSharpDirs.ProjectCsProjPath))
             {
                 // Make sure the existing project has Api assembly references configured correctly
-                CSharpProject.FixApiHintPath(GodotSharpDirs.ProjectCsProjPath);
+                CsProjOperations.FixApiHintPath(GodotSharpDirs.ProjectCsProjPath);
             }
             else
             {
@@ -418,25 +397,25 @@ namespace GodotTools
             AddControlToContainer(CustomControlContainer.Toolbar, buildButton);
 
             // External editor settings
-            EditorDef("mono/editor/external_editor", ExternalEditor.None);
+            EditorDef("mono/editor/external_editor", ExternalEditorId.None);
 
             string settingsHintStr = "Disabled";
 
             if (OS.IsWindows())
             {
-                settingsHintStr += $",MonoDevelop:{(int) ExternalEditor.MonoDevelop}" +
-                                   $",Visual Studio Code:{(int) ExternalEditor.VsCode}";
+                settingsHintStr += $",MonoDevelop:{(int) ExternalEditorId.MonoDevelop}" +
+                                   $",Visual Studio Code:{(int) ExternalEditorId.VsCode}";
             }
             else if (OS.IsOSX())
             {
-                settingsHintStr += $",Visual Studio:{(int) ExternalEditor.VisualStudioForMac}" +
-                                   $",MonoDevelop:{(int) ExternalEditor.MonoDevelop}" +
-                                   $",Visual Studio Code:{(int) ExternalEditor.VsCode}";
+                settingsHintStr += $",Visual Studio:{(int) ExternalEditorId.VisualStudioForMac}" +
+                                   $",MonoDevelop:{(int) ExternalEditorId.MonoDevelop}" +
+                                   $",Visual Studio Code:{(int) ExternalEditorId.VsCode}";
             }
             else if (OS.IsUnix())
             {
-                settingsHintStr += $",MonoDevelop:{(int) ExternalEditor.MonoDevelop}" +
-                                   $",Visual Studio Code:{(int) ExternalEditor.VsCode}";
+                settingsHintStr += $",MonoDevelop:{(int) ExternalEditorId.MonoDevelop}" +
+                                   $",Visual Studio Code:{(int) ExternalEditorId.VsCode}";
             }
 
             editorSettings.AddPropertyInfo(new Godot.Collections.Dictionary
@@ -452,7 +431,10 @@ namespace GodotTools
             AddExportPlugin(exportPlugin);
             exportPluginWeak = WeakRef(exportPlugin);
 
-            GodotSharpBuilds.Initialize();
+            BuildManager.Initialize();
+
+            GodotIdeManager = new GodotIdeManager();
+            AddChild(GodotIdeManager);
         }
 
         protected override void Dispose(bool disposing)
@@ -469,6 +451,8 @@ namespace GodotTools
 
                 exportPluginWeak.Dispose();
             }
+
+            GodotIdeManager?.Dispose();
         }
 
         public void OnBeforeSerialize()
diff --git a/modules/mono/editor/GodotTools/GodotTools/GodotSharpExport.cs b/modules/mono/editor/GodotTools/GodotTools/GodotSharpExport.cs
index b80fe1fab7..4f93ef8530 100644
--- a/modules/mono/editor/GodotTools/GodotTools/GodotSharpExport.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/GodotSharpExport.cs
@@ -16,7 +16,7 @@ namespace GodotTools
     {
         private void AddFile(string srcPath, string dstPath, bool remap = false)
         {
-            AddFile(dstPath, File.ReadAllBytes(srcPath), remap);
+            AddFile(dstPath.Replace("\\", "/"), File.ReadAllBytes(srcPath), remap);
         }
 
         public override void _ExportFile(string path, string type, string[] features)
@@ -65,14 +65,14 @@ namespace GodotTools
                 string buildConfig = isDebug ? "Debug" : "Release";
 
                 string scriptsMetadataPath = Path.Combine(GodotSharpDirs.ResMetadataDir, $"scripts_metadata.{(isDebug ? "debug" : "release")}");
-                CSharpProject.GenerateScriptsMetadata(GodotSharpDirs.ProjectCsProjPath, scriptsMetadataPath);
+                CsProjOperations.GenerateScriptsMetadata(GodotSharpDirs.ProjectCsProjPath, scriptsMetadataPath);
 
                 AddFile(scriptsMetadataPath, scriptsMetadataPath);
 
                 // Turn export features into defines
                 var godotDefines = features;
 
-                if (!GodotSharpBuilds.BuildProjectBlocking(buildConfig, godotDefines))
+                if (!BuildManager.BuildProjectBlocking(buildConfig, godotDefines))
                 {
                     GD.PushError("Failed to build project");
                     return;
diff --git a/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj b/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
index 01e8c87d14..3c57900873 100644
--- a/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
+++ b/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
@@ -10,6 +10,7 @@
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <GodotSourceRootPath>$(SolutionDir)/../../../../</GodotSourceRootPath>
     <GodotApiConfiguration>Debug</GodotApiConfiguration>
+    <LangVersion>7</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -39,26 +40,31 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Build\MsBuildFinder.cs" />
+    <Compile Include="ExternalEditorId.cs" />
+    <Compile Include="Ides\GodotIdeManager.cs" />
+    <Compile Include="Ides\GodotIdeServer.cs" />
+    <Compile Include="Ides\MonoDevelop\EditorId.cs" />
+    <Compile Include="Ides\MonoDevelop\Instance.cs" />
     <Compile Include="Internals\BindingsGenerator.cs" />
     <Compile Include="Internals\EditorProgress.cs" />
     <Compile Include="Internals\GodotSharpDirs.cs" />
     <Compile Include="Internals\Internal.cs" />
     <Compile Include="Internals\ScriptClassParser.cs" />
     <Compile Include="Internals\Globals.cs" />
-    <Compile Include="MonoDevelopInstance.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Build\BuildSystem.cs" />
     <Compile Include="Utils\Directory.cs" />
     <Compile Include="Utils\File.cs" />
+    <Compile Include="Utils\NotifyAwaiter.cs" />
     <Compile Include="Utils\OS.cs" />
     <Compile Include="GodotSharpEditor.cs" />
-    <Compile Include="GodotSharpBuilds.cs" />
+    <Compile Include="BuildManager.cs" />
     <Compile Include="HotReloadAssemblyWatcher.cs" />
-    <Compile Include="MonoBuildInfo.cs" />
-    <Compile Include="MonoBuildTab.cs" />
-    <Compile Include="MonoBottomPanel.cs" />
+    <Compile Include="BuildInfo.cs" />
+    <Compile Include="BuildTab.cs" />
+    <Compile Include="BottomPanel.cs" />
     <Compile Include="GodotSharpExport.cs" />
-    <Compile Include="CSharpProject.cs" />
+    <Compile Include="CsProjOperations.cs" />
     <Compile Include="Utils\CollectionExtensions.cs" />
   </ItemGroup>
   <ItemGroup>
@@ -66,6 +72,10 @@
       <Project>{6ce9a984-37b1-4f8a-8fe9-609f05f071b3}</Project>
       <Name>GodotTools.BuildLogger</Name>
     </ProjectReference>
+    <ProjectReference Include="..\GodotTools.IdeConnection\GodotTools.IdeConnection.csproj">
+      <Project>{92600954-25f0-4291-8e11-1fee9fc4be20}</Project>
+      <Name>GodotTools.IdeConnection</Name>
+    </ProjectReference>
     <ProjectReference Include="..\GodotTools.ProjectEditor\GodotTools.ProjectEditor.csproj">
       <Project>{A8CDAD94-C6D4-4B19-A7E7-76C53CC92984}</Project>
       <Name>GodotTools.ProjectEditor</Name>
@@ -75,8 +85,5 @@
       <Name>GodotTools.Core</Name>
     </ProjectReference>
   </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Editor" />
-  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
 </Project>
\ No newline at end of file
diff --git a/modules/mono/editor/GodotTools/GodotTools/Ides/GodotIdeManager.cs b/modules/mono/editor/GodotTools/GodotTools/Ides/GodotIdeManager.cs
new file mode 100644
index 0000000000..9e24138143
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools/Ides/GodotIdeManager.cs
@@ -0,0 +1,166 @@
+using System;
+using System.IO;
+using Godot;
+using GodotTools.IdeConnection;
+using GodotTools.Internals;
+
+namespace GodotTools.Ides
+{
+    public class GodotIdeManager : Node, ISerializationListener
+    {
+        public GodotIdeServer GodotIdeServer { get; private set; }
+
+        private MonoDevelop.Instance monoDevelInstance;
+        private MonoDevelop.Instance vsForMacInstance;
+
+        private GodotIdeServer GetRunningServer()
+        {
+            if (GodotIdeServer != null && !GodotIdeServer.IsDisposed)
+                return GodotIdeServer;
+            StartServer();
+            return GodotIdeServer;
+        }
+
+        public override void _Ready()
+        {
+            StartServer();
+        }
+
+        public void OnBeforeSerialize()
+        {
+            GodotIdeServer?.Dispose();
+        }
+
+        public void OnAfterDeserialize()
+        {
+            StartServer();
+        }
+
+        private ILogger logger;
+
+        protected ILogger Logger
+        {
+            get => logger ?? (logger = new ConsoleLogger());
+            set => logger = value;
+        }
+
+        private void StartServer()
+        {
+            GodotIdeServer?.Dispose();
+            GodotIdeServer = new GodotIdeServer(LaunchIde,
+                OS.GetExecutablePath(),
+                ProjectSettings.GlobalizePath(GodotSharpDirs.ResMetadataDir));
+
+            GodotIdeServer.Logger = Logger;
+
+            GodotIdeServer.StartServer();
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            GodotIdeServer?.Dispose();
+        }
+
+        private void LaunchIde()
+        {
+            var editor = (ExternalEditorId) GodotSharpEditor.Instance.GetEditorInterface()
+                .GetEditorSettings().GetSetting("mono/editor/external_editor");
+
+            switch (editor)
+            {
+                case ExternalEditorId.None:
+                case ExternalEditorId.VisualStudio:
+                case ExternalEditorId.VsCode:
+                    throw new NotSupportedException();
+                case ExternalEditorId.VisualStudioForMac:
+                    goto case ExternalEditorId.MonoDevelop;
+                case ExternalEditorId.MonoDevelop:
+                {
+                    MonoDevelop.Instance GetMonoDevelopInstance(string solutionPath)
+                    {
+                        if (Utils.OS.IsOSX() && editor == ExternalEditorId.VisualStudioForMac)
+                        {
+                            vsForMacInstance = vsForMacInstance ??
+                                               new MonoDevelop.Instance(solutionPath, MonoDevelop.EditorId.VisualStudioForMac);
+                            return vsForMacInstance;
+                        }
+
+                        monoDevelInstance = monoDevelInstance ??
+                                            new MonoDevelop.Instance(solutionPath, MonoDevelop.EditorId.MonoDevelop);
+                        return monoDevelInstance;
+                    }
+
+                    try
+                    {
+                        var instance = GetMonoDevelopInstance(GodotSharpDirs.ProjectSlnPath);
+
+                        if (!instance.IsRunning)
+                            instance.Execute();
+                    }
+                    catch (FileNotFoundException)
+                    {
+                        string editorName = editor == ExternalEditorId.VisualStudioForMac ? "Visual Studio" : "MonoDevelop";
+                        GD.PushError($"Cannot find code editor: {editorName}");
+                    }
+
+                    break;
+                }
+
+                default:
+                    throw new ArgumentOutOfRangeException();
+            }
+        }
+
+        private void WriteMessage(string id, params string[] arguments)
+        {
+            GetRunningServer().WriteMessage(new Message(id, arguments));
+        }
+
+        public void SendOpenFile(string file)
+        {
+            WriteMessage("OpenFile", file);
+        }
+
+        public void SendOpenFile(string file, int line)
+        {
+            WriteMessage("OpenFile", file, line.ToString());
+        }
+
+        public void SendOpenFile(string file, int line, int column)
+        {
+            WriteMessage("OpenFile", file, line.ToString(), column.ToString());
+        }
+
+        private class GodotLogger : ILogger
+        {
+            public void LogDebug(string message)
+            {
+                if (OS.IsStdoutVerbose())
+                    Console.WriteLine(message);
+            }
+
+            public void LogInfo(string message)
+            {
+                if (OS.IsStdoutVerbose())
+                    Console.WriteLine(message);
+            }
+
+            public void LogWarning(string message)
+            {
+                GD.PushWarning(message);
+            }
+
+            public void LogError(string message)
+            {
+                GD.PushError(message);
+            }
+
+            public void LogError(string message, Exception e)
+            {
+                GD.PushError(message + "\n" + e);
+            }
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools/Ides/GodotIdeServer.cs b/modules/mono/editor/GodotTools/GodotTools/Ides/GodotIdeServer.cs
new file mode 100644
index 0000000000..309b917c71
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools/Ides/GodotIdeServer.cs
@@ -0,0 +1,212 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using GodotTools.IdeConnection;
+using GodotTools.Internals;
+using GodotTools.Utils;
+using Directory = System.IO.Directory;
+using File = System.IO.File;
+using Thread = System.Threading.Thread;
+
+namespace GodotTools.Ides
+{
+    public class GodotIdeServer : GodotIdeBase
+    {
+        private readonly TcpListener listener;
+        private readonly FileStream metaFile;
+        private readonly Action launchIdeAction;
+        private readonly NotifyAwaiter<bool> clientConnectedAwaiter = new NotifyAwaiter<bool>();
+
+        private async Task<bool> AwaitClientConnected()
+        {
+            return await clientConnectedAwaiter.Reset();
+        }
+
+        public GodotIdeServer(Action launchIdeAction, string editorExecutablePath, string projectMetadataDir)
+            : base(projectMetadataDir)
+        {
+            messageHandlers = InitializeMessageHandlers();
+
+            this.launchIdeAction = launchIdeAction;
+
+            // Make sure the directory exists
+            Directory.CreateDirectory(projectMetadataDir);
+
+            // The Godot editor's file system thread can keep the file open for writing, so we are forced to allow write sharing...
+            const FileShare metaFileShare = FileShare.ReadWrite;
+
+            metaFile = File.Open(MetaFilePath, FileMode.Create, FileAccess.Write, metaFileShare);
+
+            listener = new TcpListener(new IPEndPoint(IPAddress.Loopback, port: 0));
+            listener.Start();
+
+            int port = ((IPEndPoint) listener.Server.LocalEndPoint).Port;
+            using (var metaFileWriter = new StreamWriter(metaFile, Encoding.UTF8))
+            {
+                metaFileWriter.WriteLine(port);
+                metaFileWriter.WriteLine(editorExecutablePath);
+            }
+
+            StartServer();
+        }
+
+        public void StartServer()
+        {
+            var serverThread = new Thread(RunServerThread) {Name = "Godot Ide Connection Server"};
+            serverThread.Start();
+        }
+
+        private void RunServerThread()
+        {
+            SynchronizationContext.SetSynchronizationContext(Godot.Dispatcher.SynchronizationContext);
+
+            try
+            {
+                while (!IsDisposed)
+                {
+                    TcpClient tcpClient = listener.AcceptTcpClient();
+
+                    Logger.LogInfo("Connection open with Ide Client");
+
+                    lock (ConnectionLock)
+                    {
+                        Connection = new GodotIdeConnectionServer(tcpClient, HandleMessage);
+                        Connection.Logger = Logger;
+                    }
+
+                    Connected += () => clientConnectedAwaiter.SetResult(true);
+
+                    Connection.Start();
+                }
+            }
+            catch (Exception e)
+            {
+                if (!IsDisposed && !(e is SocketException se && se.SocketErrorCode == SocketError.Interrupted))
+                    throw;
+            }
+        }
+
+        public async void WriteMessage(Message message)
+        {
+            async Task LaunchIde()
+            {
+                if (IsConnected)
+                    return;
+
+                launchIdeAction();
+                await Task.WhenAny(Task.Delay(10000), AwaitClientConnected());
+            }
+
+            await LaunchIde();
+
+            if (!IsConnected)
+            {
+                Logger.LogError("Cannot write message: Godot Ide Server not connected");
+                return;
+            }
+
+            Connection.WriteMessage(message);
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            if (disposing)
+            {
+                listener?.Stop();
+
+                metaFile?.Dispose();
+
+                File.Delete(MetaFilePath);
+            }
+        }
+
+        protected virtual bool HandleMessage(Message message)
+        {
+            if (messageHandlers.TryGetValue(message.Id, out var action))
+            {
+                action(message.Arguments);
+                return true;
+            }
+
+            return false;
+        }
+
+        private readonly Dictionary<string, Action<string[]>> messageHandlers;
+
+        private Dictionary<string, Action<string[]>> InitializeMessageHandlers()
+        {
+            return new Dictionary<string, Action<string[]>>
+            {
+                ["Play"] = args =>
+                {
+                    switch (args.Length)
+                    {
+                        case 0:
+                            Play();
+                            return;
+                        case 2:
+                            Play(debuggerHost: args[0], debuggerPort: int.Parse(args[1]));
+                            return;
+                        default:
+                            throw new ArgumentException();
+                    }
+                },
+                ["ReloadScripts"] = args => ReloadScripts()
+            };
+        }
+
+        private void DispatchToMainThread(Action action)
+        {
+            var d = new SendOrPostCallback(state => action());
+            Godot.Dispatcher.SynchronizationContext.Post(d, null);
+        }
+
+        private void Play()
+        {
+            DispatchToMainThread(() =>
+            {
+                CurrentPlayRequest = new PlayRequest();
+                Internal.EditorRunPlay();
+                CurrentPlayRequest = null;
+            });
+        }
+
+        private void Play(string debuggerHost, int debuggerPort)
+        {
+            DispatchToMainThread(() =>
+            {
+                CurrentPlayRequest = new PlayRequest(debuggerHost, debuggerPort);
+                Internal.EditorRunPlay();
+                CurrentPlayRequest = null;
+            });
+        }
+
+        private void ReloadScripts()
+        {
+            DispatchToMainThread(Internal.ScriptEditorDebugger_ReloadScripts);
+        }
+
+        public PlayRequest? CurrentPlayRequest { get; private set; }
+
+        public struct PlayRequest
+        {
+            public bool HasDebugger { get; }
+            public string DebuggerHost { get; }
+            public int DebuggerPort { get; }
+
+            public PlayRequest(string debuggerHost, int debuggerPort)
+            {
+                HasDebugger = true;
+                DebuggerHost = debuggerHost;
+                DebuggerPort = debuggerPort;
+            }
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools/Ides/MonoDevelop/EditorId.cs b/modules/mono/editor/GodotTools/GodotTools/Ides/MonoDevelop/EditorId.cs
new file mode 100644
index 0000000000..1dfc91d6d1
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools/Ides/MonoDevelop/EditorId.cs
@@ -0,0 +1,8 @@
+namespace GodotTools.Ides.MonoDevelop
+{
+    public enum EditorId
+    {
+        MonoDevelop = 0,
+        VisualStudioForMac = 1
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools/MonoDevelopInstance.cs b/modules/mono/editor/GodotTools/GodotTools/Ides/MonoDevelop/Instance.cs
index 0c8d86e799..1fdccf5bbd 100644
--- a/modules/mono/editor/GodotTools/GodotTools/MonoDevelopInstance.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Ides/MonoDevelop/Instance.cs
@@ -1,26 +1,22 @@
-using GodotTools.Core;
 using System;
 using System.IO;
 using System.Collections.Generic;
 using System.Diagnostics;
 using GodotTools.Internals;
+using GodotTools.Utils;
 
-namespace GodotTools
+namespace GodotTools.Ides.MonoDevelop
 {
-    public class MonoDevelopInstance
+    public class Instance
     {
-        public enum EditorId
-        {
-            MonoDevelop = 0,
-            VisualStudioForMac = 1
-        }
-
         private readonly string solutionFile;
         private readonly EditorId editorId;
 
         private Process process;
 
-        public void Execute(params string[] files)
+        public bool IsRunning => process != null && !process.HasExited;
+
+        public void Execute()
         {
             bool newWindow = process == null || process.HasExited;
 
@@ -28,9 +24,9 @@ namespace GodotTools
 
             string command;
 
-            if (Utils.OS.IsOSX())
+            if (OS.IsOSX())
             {
-                string bundleId = CodeEditorBundleIds[editorId];
+                string bundleId = BundleIds[editorId];
 
                 if (Internal.IsOsxAppBundleInstalled(bundleId))
                 {
@@ -47,12 +43,12 @@ namespace GodotTools
                 }
                 else
                 {
-                    command = CodeEditorPaths[editorId];
+                    command = OS.PathWhich(ExecutableNames[editorId]);
                 }
             }
             else
             {
-                command = CodeEditorPaths[editorId];
+                command = OS.PathWhich(ExecutableNames[editorId]);
             }
 
             args.Add("--ipc-tcp");
@@ -60,15 +56,8 @@ namespace GodotTools
             if (newWindow)
                 args.Add("\"" + Path.GetFullPath(solutionFile) + "\"");
 
-            foreach (var file in files)
-            {
-                int semicolonIndex = file.IndexOf(';');
-
-                string filePath = semicolonIndex < 0 ? file : file.Substring(0, semicolonIndex);
-                string cursor = semicolonIndex < 0 ? string.Empty : file.Substring(semicolonIndex);
-
-                args.Add("\"" + Path.GetFullPath(filePath.NormalizePath()) + cursor + "\"");
-            }
+            if (command == null)
+                throw new FileNotFoundException();
 
             if (newWindow)
             {
@@ -76,7 +65,7 @@ namespace GodotTools
                 {
                     FileName = command,
                     Arguments = string.Join(" ", args),
-                    UseShellExecute = false
+                    UseShellExecute = true
                 });
             }
             else
@@ -85,42 +74,42 @@ namespace GodotTools
                 {
                     FileName = command,
                     Arguments = string.Join(" ", args),
-                    UseShellExecute = false
+                    UseShellExecute = true
                 })?.Dispose();
             }
         }
 
-        public MonoDevelopInstance(string solutionFile, EditorId editorId)
+        public Instance(string solutionFile, EditorId editorId)
         {
-            if (editorId == EditorId.VisualStudioForMac && !Utils.OS.IsOSX())
+            if (editorId == EditorId.VisualStudioForMac && !OS.IsOSX())
                 throw new InvalidOperationException($"{nameof(EditorId.VisualStudioForMac)} not supported on this platform");
 
             this.solutionFile = solutionFile;
             this.editorId = editorId;
         }
 
-        private static readonly IReadOnlyDictionary<EditorId, string> CodeEditorPaths;
-        private static readonly IReadOnlyDictionary<EditorId, string> CodeEditorBundleIds;
+        private static readonly IReadOnlyDictionary<EditorId, string> ExecutableNames;
+        private static readonly IReadOnlyDictionary<EditorId, string> BundleIds;
 
-        static MonoDevelopInstance()
+        static Instance()
         {
-            if (Utils.OS.IsOSX())
+            if (OS.IsOSX())
             {
-                CodeEditorPaths = new Dictionary<EditorId, string>
+                ExecutableNames = new Dictionary<EditorId, string>
                 {
                     // Rely on PATH
                     {EditorId.MonoDevelop, "monodevelop"},
                     {EditorId.VisualStudioForMac, "VisualStudio"}
                 };
-                CodeEditorBundleIds = new Dictionary<EditorId, string>
+                BundleIds = new Dictionary<EditorId, string>
                 {
                     // TODO EditorId.MonoDevelop
                     {EditorId.VisualStudioForMac, "com.microsoft.visual-studio"}
                 };
             }
-            else if (Utils.OS.IsWindows())
+            else if (OS.IsWindows())
             {
-                CodeEditorPaths = new Dictionary<EditorId, string>
+                ExecutableNames = new Dictionary<EditorId, string>
                 {
                     // XamarinStudio is no longer a thing, and the latest version is quite old
                     // MonoDevelop is available from source only on Windows. The recommendation
@@ -129,9 +118,9 @@ namespace GodotTools
                     {EditorId.MonoDevelop, "MonoDevelop.exe"}
                 };
             }
-            else if (Utils.OS.IsUnix())
+            else if (OS.IsUnix())
             {
-                CodeEditorPaths = new Dictionary<EditorId, string>
+                ExecutableNames = new Dictionary<EditorId, string>
                 {
                     // Rely on PATH
                     {EditorId.MonoDevelop, "monodevelop"}
diff --git a/modules/mono/editor/GodotTools/GodotTools/Internals/Internal.cs b/modules/mono/editor/GodotTools/GodotTools/Internals/Internal.cs
index 9526dd3c6f..7783576910 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Internals/Internal.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Internals/Internal.cs
@@ -46,6 +46,12 @@ namespace GodotTools.Internals
 
         public static string MonoWindowsInstallRoot => internal_MonoWindowsInstallRoot();
 
+        public static void EditorRunPlay() => internal_EditorRunPlay();
+
+        public static void EditorRunStop() => internal_EditorRunStop();
+
+        public static void ScriptEditorDebugger_ReloadScripts() => internal_ScriptEditorDebugger_ReloadScripts();
+
         // Internal Calls
 
         [MethodImpl(MethodImplOptions.InternalCall)]
@@ -95,5 +101,14 @@ namespace GodotTools.Internals
 
         [MethodImpl(MethodImplOptions.InternalCall)]
         private static extern string internal_MonoWindowsInstallRoot();
+
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        private static extern void internal_EditorRunPlay();
+
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        private static extern void internal_EditorRunStop();
+
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        private static extern void internal_ScriptEditorDebugger_ReloadScripts();
     }
 }
diff --git a/modules/mono/editor/GodotTools/GodotTools/Utils/CollectionExtensions.cs b/modules/mono/editor/GodotTools/GodotTools/Utils/CollectionExtensions.cs
index 3ae6c10bbf..e3c2c822a5 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Utils/CollectionExtensions.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Utils/CollectionExtensions.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 
 namespace GodotTools.Utils
 {
@@ -10,11 +11,19 @@ namespace GodotTools.Utils
         {
             foreach (T elem in enumerable)
             {
-                if (predicate(elem) != null)
-                    return elem;
+                T result = predicate(elem);
+                if (result != null)
+                    return result;
             }
 
             return orElse;
         }
+
+        public static IEnumerable<string> EnumerateLines(this TextReader textReader)
+        {
+            string line;
+            while ((line = textReader.ReadLine()) != null)
+                yield return line;
+        }
     }
 }
diff --git a/modules/mono/editor/GodotTools/GodotTools/Utils/NotifyAwaiter.cs b/modules/mono/editor/GodotTools/GodotTools/Utils/NotifyAwaiter.cs
new file mode 100644
index 0000000000..700b786752
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools/Utils/NotifyAwaiter.cs
@@ -0,0 +1,64 @@
+using System;
+using System.Runtime.CompilerServices;
+
+namespace GodotTools.Utils
+{
+    public sealed class NotifyAwaiter<T> : INotifyCompletion
+    {
+        private Action continuation;
+        private Exception exception;
+        private T result;
+
+        public bool IsCompleted { get; private set; }
+
+        public T GetResult()
+        {
+            if (exception != null)
+                throw exception;
+            return result;
+        }
+
+        public void OnCompleted(Action continuation)
+        {
+            if (this.continuation != null)
+                throw new InvalidOperationException("This awaiter has already been listened");
+            this.continuation = continuation;
+        }
+
+        public void SetResult(T result)
+        {
+            if (IsCompleted)
+                throw new InvalidOperationException("This awaiter is already completed");
+
+            IsCompleted = true;
+            this.result = result;
+
+            continuation?.Invoke();
+        }
+
+        public void SetException(Exception exception)
+        {
+            if (IsCompleted)
+                throw new InvalidOperationException("This awaiter is already completed");
+
+            IsCompleted = true;
+            this.exception = exception;
+
+            continuation?.Invoke();
+        }
+
+        public NotifyAwaiter<T> Reset()
+        {
+            continuation = null;
+            exception = null;
+            result = default(T);
+            IsCompleted = false;
+            return this;
+        }
+
+        public NotifyAwaiter<T> GetAwaiter()
+        {
+            return this;
+        }
+    }
+}
diff --git a/modules/mono/editor/bindings_generator.cpp b/modules/mono/editor/bindings_generator.cpp
index 45037bf637..1888bb3cb9 100644
--- a/modules/mono/editor/bindings_generator.cpp
+++ b/modules/mono/editor/bindings_generator.cpp
@@ -279,7 +279,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 			Vector<String> link_target_parts = link_target.split(".");
 
 			if (link_target_parts.size() <= 0 || link_target_parts.size() > 2) {
-				ERR_PRINTS("Invalid reference format: " + tag);
+				ERR_PRINTS("Invalid reference format: '" + tag + "'.");
 
 				xml_output.append("<c>");
 				xml_output.append(tag);
@@ -375,7 +375,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 					xml_output.append(target_enum_itype.proxy_name); // Includes nesting class if any
 					xml_output.append("\"/>");
 				} else {
-					ERR_PRINTS("Cannot resolve enum reference in documentation: " + link_target);
+					ERR_PRINTS("Cannot resolve enum reference in documentation: '" + link_target + "'.");
 
 					xml_output.append("<c>");
 					xml_output.append(link_target);
@@ -424,7 +424,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 							xml_output.append(target_iconst->proxy_name);
 							xml_output.append("\"/>");
 						} else {
-							ERR_PRINTS("Cannot resolve global constant reference in documentation: " + link_target);
+							ERR_PRINTS("Cannot resolve global constant reference in documentation: '" + link_target + "'.");
 
 							xml_output.append("<c>");
 							xml_output.append(link_target);
@@ -464,7 +464,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 							xml_output.append(target_iconst->proxy_name);
 							xml_output.append("\"/>");
 						} else {
-							ERR_PRINTS("Cannot resolve constant reference in documentation: " + link_target);
+							ERR_PRINTS("Cannot resolve constant reference in documentation: '" + link_target + "'.");
 
 							xml_output.append("<c>");
 							xml_output.append(link_target);
@@ -534,7 +534,7 @@ String BindingsGenerator::bbcode_to_xml(const String &p_bbcode, const TypeInterf
 					xml_output.append(target_itype->proxy_name);
 					xml_output.append("\"/>");
 				} else {
-					ERR_PRINTS("Cannot resolve type reference in documentation: " + tag);
+					ERR_PRINTS("Cannot resolve type reference in documentation: '" + tag + "'.");
 
 					xml_output.append("<c>");
 					xml_output.append(tag);
@@ -812,7 +812,7 @@ void BindingsGenerator::_generate_global_constants(StringBuilder &p_output) {
 
 			CRASH_COND(enum_class_name != "Variant"); // Hard-coded...
 
-			_log("Declaring global enum `%s` inside static class `%s`\n", enum_proxy_name.utf8().get_data(), enum_class_name.utf8().get_data());
+			_log("Declaring global enum '%s' inside static class '%s'\n", enum_proxy_name.utf8().get_data(), enum_class_name.utf8().get_data());
 
 			p_output.append("\n" INDENT1 "public static partial class ");
 			p_output.append(enum_class_name);
@@ -1083,7 +1083,7 @@ Error BindingsGenerator::generate_cs_api(const String &p_output_dir) {
 
 	proj_err = generate_cs_core_project(core_proj_dir, core_compile_items);
 	if (proj_err != OK) {
-		ERR_PRINT("Generation of the Core API C# project failed");
+		ERR_PRINT("Generation of the Core API C# project failed.");
 		return proj_err;
 	}
 
@@ -1094,7 +1094,7 @@ Error BindingsGenerator::generate_cs_api(const String &p_output_dir) {
 
 	proj_err = generate_cs_editor_project(editor_proj_dir, editor_compile_items);
 	if (proj_err != OK) {
-		ERR_PRINT("Generation of the Editor API C# project failed");
+		ERR_PRINT("Generation of the Editor API C# project failed.");
 		return proj_err;
 	}
 
@@ -1112,7 +1112,7 @@ Error BindingsGenerator::generate_cs_api(const String &p_output_dir) {
 
 // FIXME: There are some members that hide other inherited members.
 // - In the case of both members being the same kind, the new one must be declared
-// explicitly as `new` to avoid the warning (and we must print a message about it).
+// explicitly as 'new' to avoid the warning (and we must print a message about it).
 // - In the case of both members being of a different kind, then the new one must
 // be renamed to avoid the name collision (and we must print a warning about it).
 // - Csc warning e.g.:
@@ -1186,7 +1186,7 @@ Error BindingsGenerator::_generate_cs_type(const TypeInterface &itype, const Str
 			output.append(obj_types[itype.base_name].proxy_name);
 			output.append("\n");
 		} else {
-			ERR_PRINTS("Base type '" + itype.base_name.operator String() + "' does not exist, for class " + itype.name);
+			ERR_PRINTS("Base type '" + itype.base_name.operator String() + "' does not exist, for class '" + itype.name + "'.");
 			return ERR_INVALID_DATA;
 		}
 	}
@@ -1273,11 +1273,9 @@ Error BindingsGenerator::_generate_cs_type(const TypeInterface &itype, const Str
 		for (const List<PropertyInterface>::Element *E = itype.properties.front(); E; E = E->next()) {
 			const PropertyInterface &iprop = E->get();
 			Error prop_err = _generate_cs_property(itype, iprop, output);
-			if (prop_err != OK) {
-				ERR_EXPLAIN("Failed to generate property '" + iprop.cname.operator String() +
-							"' for class '" + itype.name + "'");
-				ERR_FAIL_V(prop_err);
-			}
+			ERR_FAIL_COND_V_MSG(prop_err != OK, prop_err,
+					"Failed to generate property '" + iprop.cname.operator String() +
+							"' for class '" + itype.name + "'.");
 		}
 	}
 
@@ -1340,10 +1338,8 @@ Error BindingsGenerator::_generate_cs_type(const TypeInterface &itype, const Str
 	for (const List<MethodInterface>::Element *E = itype.methods.front(); E; E = E->next()) {
 		const MethodInterface &imethod = E->get();
 		Error method_err = _generate_cs_method(itype, imethod, method_bind_count, output);
-		if (method_err != OK) {
-			ERR_EXPLAIN("Failed to generate method '" + imethod.name + "' for class '" + itype.name + "'");
-			ERR_FAIL_V(method_err);
-		}
+		ERR_FAIL_COND_V_MSG(method_err != OK, method_err,
+				"Failed to generate method '" + imethod.name + "' for class '" + itype.name + "'.");
 	}
 
 	if (itype.is_singleton) {
@@ -1626,7 +1622,7 @@ Error BindingsGenerator::_generate_cs_method(const BindingsGenerator::TypeInterf
 
 		if (p_imethod.is_deprecated) {
 			if (p_imethod.deprecation_message.empty())
-				WARN_PRINTS("An empty deprecation message is discouraged. Method: " + p_imethod.proxy_name);
+				WARN_PRINTS("An empty deprecation message is discouraged. Method: '" + p_imethod.proxy_name + "'.");
 
 			p_output.append(MEMBER_BEGIN "[Obsolete(\"");
 			p_output.append(p_imethod.deprecation_message);
@@ -1708,8 +1704,7 @@ Error BindingsGenerator::_generate_cs_method(const BindingsGenerator::TypeInterf
 Error BindingsGenerator::generate_glue(const String &p_output_dir) {
 
 	bool dir_exists = DirAccess::exists(p_output_dir);
-	ERR_EXPLAIN("The output directory does not exist.");
-	ERR_FAIL_COND_V(!dir_exists, ERR_FILE_BAD_PATH);
+	ERR_FAIL_COND_V_MSG(!dir_exists, ERR_FILE_BAD_PATH, "The output directory does not exist.");
 
 	StringBuilder output;
 
@@ -1742,10 +1737,8 @@ Error BindingsGenerator::generate_glue(const String &p_output_dir) {
 		for (const List<MethodInterface>::Element *E = itype.methods.front(); E; E = E->next()) {
 			const MethodInterface &imethod = E->get();
 			Error method_err = _generate_glue_method(itype, imethod, output);
-			if (method_err != OK) {
-				ERR_EXPLAIN("Failed to generate method '" + imethod.name + "' for class '" + itype.name + "'");
-				ERR_FAIL_V(method_err);
-			}
+			ERR_FAIL_COND_V_MSG(method_err != OK, method_err,
+					"Failed to generate method '" + imethod.name + "' for class '" + itype.name + "'.");
 		}
 
 		if (itype.is_singleton) {
@@ -1879,8 +1872,7 @@ Error BindingsGenerator::_save_file(const String &p_path, const StringBuilder &p
 
 	FileAccessRef file = FileAccess::open(p_path, FileAccess::WRITE);
 
-	ERR_EXPLAIN("Cannot open file: " + p_path);
-	ERR_FAIL_COND_V(!file, ERR_FILE_CANT_WRITE);
+	ERR_FAIL_COND_V_MSG(!file, ERR_FILE_CANT_WRITE, "Cannot open file: '" + p_path + "'.");
 
 	file->store_string(p_content.as_string());
 	file->close();
@@ -2091,7 +2083,7 @@ const BindingsGenerator::TypeInterface *BindingsGenerator::_get_type_or_placehol
 	if (found)
 		return found;
 
-	ERR_PRINTS(String() + "Type not found. Creating placeholder: " + p_typeref.cname.operator String());
+	ERR_PRINTS(String() + "Type not found. Creating placeholder: '" + p_typeref.cname.operator String() + "'.");
 
 	const Map<StringName, TypeInterface>::Element *match = placeholder_types.find(p_typeref.cname);
 
@@ -2175,13 +2167,13 @@ void BindingsGenerator::_populate_object_type_interfaces() {
 		}
 
 		if (!ClassDB::is_class_exposed(type_cname)) {
-			_log("Ignoring type `%s` because it's not exposed\n", String(type_cname).utf8().get_data());
+			_log("Ignoring type '%s' because it's not exposed\n", String(type_cname).utf8().get_data());
 			class_list.pop_front();
 			continue;
 		}
 
 		if (!ClassDB::is_class_enabled(type_cname)) {
-			_log("Ignoring type `%s` because it's not enabled\n", String(type_cname).utf8().get_data());
+			_log("Ignoring type '%s' because it's not enabled\n", String(type_cname).utf8().get_data());
 			class_list.pop_front();
 			continue;
 		}
@@ -2240,7 +2232,7 @@ void BindingsGenerator::_populate_object_type_interfaces() {
 
 			// Prevent the property and its enclosing type from sharing the same name
 			if (iprop.proxy_name == itype.proxy_name) {
-				_log("Name of property `%s` is ambiguous with the name of its enclosing class `%s`. Renaming property to `%s_`\n",
+				_log("Name of property '%s' is ambiguous with the name of its enclosing class '%s'. Renaming property to '%s_'\n",
 						iprop.proxy_name.utf8().get_data(), itype.proxy_name.utf8().get_data(), iprop.proxy_name.utf8().get_data());
 
 				iprop.proxy_name += "_";
@@ -2298,28 +2290,26 @@ void BindingsGenerator::_populate_object_type_interfaces() {
 			imethod.is_vararg = m && m->is_vararg();
 
 			if (!m && !imethod.is_virtual) {
-				if (virtual_method_list.find(method_info)) {
-					// A virtual method without the virtual flag. This is a special case.
-
-					// There is no method bind, so let's fallback to Godot's object.Call(string, params)
-					imethod.requires_object_call = true;
-
-					// The method Object.free is registered as a virtual method, but without the virtual flag.
-					// This is because this method is not supposed to be overridden, but called.
-					// We assume the return type is void.
-					imethod.return_type.cname = name_cache.type_void;
-
-					// Actually, more methods like this may be added in the future,
-					// which could actually will return something different.
-					// Let's put this to notify us if that ever happens.
-					if (itype.cname != name_cache.type_Object || imethod.name != "free") {
-						ERR_PRINTS("Notification: New unexpected virtual non-overridable method found.\n"
-								   "We only expected Object.free, but found " +
-								   itype.name + "." + imethod.name);
-					}
-				} else {
-					ERR_EXPLAIN("Missing MethodBind for non-virtual method: " + itype.name + "." + imethod.name);
-					ERR_FAIL();
+				ERR_FAIL_COND_MSG(!virtual_method_list.find(method_info),
+						"Missing MethodBind for non-virtual method: '" + itype.name + "." + imethod.name + "'.");
+
+				// A virtual method without the virtual flag. This is a special case.
+
+				// There is no method bind, so let's fallback to Godot's object.Call(string, params)
+				imethod.requires_object_call = true;
+
+				// The method Object.free is registered as a virtual method, but without the virtual flag.
+				// This is because this method is not supposed to be overridden, but called.
+				// We assume the return type is void.
+				imethod.return_type.cname = name_cache.type_void;
+
+				// Actually, more methods like this may be added in the future,
+				// which could actually will return something different.
+				// Let's put this to notify us if that ever happens.
+				if (itype.cname != name_cache.type_Object || imethod.name != "free") {
+					ERR_PRINTS("Notification: New unexpected virtual non-overridable method found."
+							   " We only expected Object.free, but found '" +
+							   itype.name + "." + imethod.name + "'.");
 				}
 			} else if (return_info.type == Variant::INT && return_info.usage & PROPERTY_USAGE_CLASS_IS_ENUM) {
 				imethod.return_type.cname = return_info.class_name;
@@ -2328,8 +2318,8 @@ void BindingsGenerator::_populate_object_type_interfaces() {
 				imethod.return_type.cname = return_info.class_name;
 				if (!imethod.is_virtual && ClassDB::is_parent_class(return_info.class_name, name_cache.type_Reference) && return_info.hint != PROPERTY_HINT_RESOURCE_TYPE) {
 					/* clang-format off */
-					ERR_PRINTS("Return type is reference but hint is not " _STR(PROPERTY_HINT_RESOURCE_TYPE) "."
-							" Are you returning a reference type by pointer? Method: " + itype.name + "." + imethod.name);
+					ERR_PRINTS("Return type is reference but hint is not '" _STR(PROPERTY_HINT_RESOURCE_TYPE) "'."
+							" Are you returning a reference type by pointer? Method: '" + itype.name + "." + imethod.name + "'.");
 					/* clang-format on */
 					ERR_FAIL();
 				}
@@ -2394,7 +2384,7 @@ void BindingsGenerator::_populate_object_type_interfaces() {
 
 			// Prevent the method and its enclosing type from sharing the same name
 			if (imethod.proxy_name == itype.proxy_name) {
-				_log("Name of method `%s` is ambiguous with the name of its enclosing class `%s`. Renaming method to `%s_`\n",
+				_log("Name of method '%s' is ambiguous with the name of its enclosing class '%s'. Renaming method to '%s_'\n",
 						imethod.proxy_name.utf8().get_data(), itype.proxy_name.utf8().get_data(), imethod.proxy_name.utf8().get_data());
 
 				imethod.proxy_name += "_";
@@ -2880,8 +2870,7 @@ void BindingsGenerator::_populate_global_constants() {
 	if (global_constants_count > 0) {
 		Map<String, DocData::ClassDoc>::Element *match = EditorHelp::get_doc_data()->class_list.find("@GlobalScope");
 
-		ERR_EXPLAIN("Could not find `@GlobalScope` in DocData");
-		CRASH_COND(!match);
+		CRASH_COND_MSG(!match, "Could not find '@GlobalScope' in DocData.");
 
 		const DocData::ClassDoc &global_scope_doc = match->value();
 
@@ -2935,7 +2924,7 @@ void BindingsGenerator::_populate_global_constants() {
 			// HARDCODED: The Error enum have the prefix 'ERR_' for everything except 'OK' and 'FAILED'.
 			if (ienum.cname == name_cache.enum_Error) {
 				if (prefix_length > 0) { // Just in case it ever changes
-					ERR_PRINTS("Prefix for enum 'Error' is not empty");
+					ERR_PRINTS("Prefix for enum '" _STR(Error) "' is not empty.");
 				}
 
 				prefix_length = 1; // 'ERR_'
@@ -3024,7 +3013,7 @@ void BindingsGenerator::handle_cmdline_args(const List<String> &p_cmdline_args)
 				glue_dir_path = path_elem->get();
 				elem = elem->next();
 			} else {
-				ERR_PRINTS(generate_all_glue_option + ": No output directory specified (expected path to {GODOT_ROOT}/modules/mono/glue)");
+				ERR_PRINTS(generate_all_glue_option + ": No output directory specified (expected path to '{GODOT_ROOT}/modules/mono/glue').");
 			}
 
 			--options_left;
@@ -3035,7 +3024,7 @@ void BindingsGenerator::handle_cmdline_args(const List<String> &p_cmdline_args)
 				cs_dir_path = path_elem->get();
 				elem = elem->next();
 			} else {
-				ERR_PRINTS(generate_cs_glue_option + ": No output directory specified");
+				ERR_PRINTS(generate_cs_glue_option + ": No output directory specified.");
 			}
 
 			--options_left;
@@ -3046,7 +3035,7 @@ void BindingsGenerator::handle_cmdline_args(const List<String> &p_cmdline_args)
 				cpp_dir_path = path_elem->get();
 				elem = elem->next();
 			} else {
-				ERR_PRINTS(generate_cpp_glue_option + ": No output directory specified");
+				ERR_PRINTS(generate_cpp_glue_option + ": No output directory specified.");
 			}
 
 			--options_left;
@@ -3061,20 +3050,20 @@ void BindingsGenerator::handle_cmdline_args(const List<String> &p_cmdline_args)
 
 		if (glue_dir_path.length()) {
 			if (bindings_generator.generate_glue(glue_dir_path) != OK)
-				ERR_PRINTS(generate_all_glue_option + ": Failed to generate the C++ glue");
+				ERR_PRINTS(generate_all_glue_option + ": Failed to generate the C++ glue.");
 
 			if (bindings_generator.generate_cs_api(glue_dir_path.plus_file("Managed/Generated")) != OK)
-				ERR_PRINTS(generate_all_glue_option + ": Failed to generate the C# API");
+				ERR_PRINTS(generate_all_glue_option + ": Failed to generate the C# API.");
 		}
 
 		if (cs_dir_path.length()) {
 			if (bindings_generator.generate_cs_api(cs_dir_path) != OK)
-				ERR_PRINTS(generate_cs_glue_option + ": Failed to generate the C# API");
+				ERR_PRINTS(generate_cs_glue_option + ": Failed to generate the C# API.");
 		}
 
 		if (cpp_dir_path.length()) {
 			if (bindings_generator.generate_glue(cpp_dir_path) != OK)
-				ERR_PRINTS(generate_cpp_glue_option + ": Failed to generate the C++ glue");
+				ERR_PRINTS(generate_cpp_glue_option + ": Failed to generate the C++ glue.");
 		}
 
 		// Exit once done
diff --git a/modules/mono/editor/bindings_generator.h b/modules/mono/editor/bindings_generator.h
index 8be51a6c55..6f0c297575 100644
--- a/modules/mono/editor/bindings_generator.h
+++ b/modules/mono/editor/bindings_generator.h
@@ -147,7 +147,7 @@ class BindingsGenerator {
 		bool requires_object_call;
 
 		/**
-		 * Determines if the method visibility is `internal` (visible only to files in the same assembly).
+		 * Determines if the method visibility is 'internal' (visible only to files in the same assembly).
 		 * Currently, we only use this for methods that are not meant to be exposed,
 		 * but are required by properties as getters or setters.
 		 * Methods that are not meant to be exposed are those that begin with underscore and are not virtual.
diff --git a/modules/mono/editor/csharp_project.cpp b/modules/mono/editor/csharp_project.cpp
index d88b08c646..0e6c58c9d7 100644
--- a/modules/mono/editor/csharp_project.cpp
+++ b/modules/mono/editor/csharp_project.cpp
@@ -81,16 +81,14 @@ bool generate_api_solution(const String &p_solution_dir, const String &p_core_pr
 
 		_GDMONO_SCOPE_DOMAIN_(temp_domain);
 
-		GDMonoAssembly *tools_project_editor_assembly = NULL;
+		GDMonoAssembly *tools_project_editor_asm = NULL;
 
-		if (!GDMono::get_singleton()->load_assembly("GodotTools.ProjectEditor", &tools_project_editor_assembly)) {
-			ERR_EXPLAIN("Failed to load assembly: 'GodotTools.ProjectEditor'");
-			ERR_FAIL_V(false);
-		}
+		bool assembly_loaded = GDMono::get_singleton()->load_assembly(TOOLS_PROJECT_EDITOR_ASM_NAME, &tools_project_editor_asm);
+		ERR_FAIL_COND_V_MSG(!assembly_loaded, false, "Failed to load assembly: '" TOOLS_PROJECT_EDITOR_ASM_NAME "'.");
 
 		return generate_api_solution_impl(p_solution_dir, p_core_proj_dir, p_core_compile_items,
 				p_editor_proj_dir, p_editor_compile_items,
-				tools_project_editor_assembly);
+				tools_project_editor_asm);
 	}
 }
 
diff --git a/modules/mono/editor/editor_internal_calls.cpp b/modules/mono/editor/editor_internal_calls.cpp
index 0014aaca70..5a84d9e3b8 100644
--- a/modules/mono/editor/editor_internal_calls.cpp
+++ b/modules/mono/editor/editor_internal_calls.cpp
@@ -271,7 +271,7 @@ MonoString *godot_icall_Internal_SimplifyGodotPath(MonoString *p_path) {
 MonoBoolean godot_icall_Internal_IsOsxAppBundleInstalled(MonoString *p_bundle_id) {
 #ifdef OSX_ENABLED
 	String bundle_id = GDMonoMarshal::mono_string_to_godot(p_bundle_id);
-	return (MonoBoolean)osx_is_app_bundle_installed;
+	return (MonoBoolean)osx_is_app_bundle_installed(bundle_id);
 #else
 	(void)p_bundle_id; // UNUSED
 	return (MonoBoolean) false;
@@ -350,6 +350,21 @@ MonoString *godot_icall_Internal_MonoWindowsInstallRoot() {
 #endif
 }
 
+void godot_icall_Internal_EditorRunPlay() {
+	EditorNode::get_singleton()->run_play();
+}
+
+void godot_icall_Internal_EditorRunStop() {
+	EditorNode::get_singleton()->run_stop();
+}
+
+void godot_icall_Internal_ScriptEditorDebugger_ReloadScripts() {
+	ScriptEditorDebugger *sed = ScriptEditor::get_singleton()->get_debugger();
+	if (sed) {
+		sed->reload_scripts();
+	}
+}
+
 MonoString *godot_icall_Utils_OS_GetPlatformName() {
 	String os_name = OS::get_singleton()->get_name();
 	return GDMonoMarshal::mono_string_from_godot(os_name);
@@ -415,6 +430,9 @@ void register_editor_internal_calls() {
 	mono_add_internal_call("GodotTools.Internals.Internal::internal_EditorNodeShowScriptScreen", (void *)godot_icall_Internal_EditorNodeShowScriptScreen);
 	mono_add_internal_call("GodotTools.Internals.Internal::internal_GetScriptsMetadataOrNothing", (void *)godot_icall_Internal_GetScriptsMetadataOrNothing);
 	mono_add_internal_call("GodotTools.Internals.Internal::internal_MonoWindowsInstallRoot", (void *)godot_icall_Internal_MonoWindowsInstallRoot);
+	mono_add_internal_call("GodotTools.Internals.Internal::internal_EditorRunPlay", (void *)godot_icall_Internal_EditorRunPlay);
+	mono_add_internal_call("GodotTools.Internals.Internal::internal_EditorRunStop", (void *)godot_icall_Internal_EditorRunStop);
+	mono_add_internal_call("GodotTools.Internals.Internal::internal_ScriptEditorDebugger_ReloadScripts", (void *)godot_icall_Internal_ScriptEditorDebugger_ReloadScripts);
 
 	// Globals
 	mono_add_internal_call("GodotTools.Internals.Globals::internal_EditorScale", (void *)godot_icall_Globals_EditorScale);
diff --git a/modules/mono/editor/godotsharp_export.cpp b/modules/mono/editor/godotsharp_export.cpp
index 020bb70a08..80a7335b1d 100644
--- a/modules/mono/editor/godotsharp_export.cpp
+++ b/modules/mono/editor/godotsharp_export.cpp
@@ -85,18 +85,12 @@ Error GodotSharpExport::get_assembly_dependencies(GDMonoAssembly *p_assembly, co
 			}
 		}
 
-		if (!ref_assembly) {
-			ERR_EXPLAIN("Cannot load assembly (refonly): " + ref_name);
-			ERR_FAIL_V(ERR_CANT_RESOLVE);
-		}
+		ERR_FAIL_COND_V_MSG(!ref_assembly, ERR_CANT_RESOLVE, "Cannot load assembly (refonly): '" + ref_name + "'.");
 
 		r_dependencies[ref_name] = ref_assembly->get_path();
 
 		Error err = get_assembly_dependencies(ref_assembly, p_search_dirs, r_dependencies);
-		if (err != OK) {
-			ERR_EXPLAIN("Cannot load one of the dependencies for the assembly: " + ref_name);
-			ERR_FAIL_V(err);
-		}
+		ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot load one of the dependencies for the assembly: '" + ref_name + "'.");
 	}
 
 	return OK;
@@ -113,8 +107,7 @@ Error GodotSharpExport::get_exported_assembly_dependencies(const String &p_proje
 	bool load_success = GDMono::get_singleton()->load_assembly_from(p_project_dll_name,
 			p_project_dll_src_path, &scripts_assembly, /* refonly: */ true);
 
-	ERR_EXPLAIN("Cannot load assembly (refonly): " + p_project_dll_name);
-	ERR_FAIL_COND_V(!load_success, ERR_CANT_RESOLVE);
+	ERR_FAIL_COND_V_MSG(!load_success, ERR_CANT_RESOLVE, "Cannot load assembly (refonly): '" + p_project_dll_name + "'.");
 
 	Vector<String> search_dirs;
 	GDMonoAssembly::fill_search_dirs(search_dirs, p_build_config, p_custom_lib_dir);
diff --git a/modules/mono/editor/script_class_parser.cpp b/modules/mono/editor/script_class_parser.cpp
index dfb652a7aa..dcb0ca5a80 100644
--- a/modules/mono/editor/script_class_parser.cpp
+++ b/modules/mono/editor/script_class_parser.cpp
@@ -162,8 +162,8 @@ ScriptClassParser::Token ScriptClassParser::get_token() {
 						error = true;
 						return TK_ERROR;
 					} else if (code[idx] == begin_str) {
-						if (verbatim && code[idx + 1] == '"') { // `""` is verbatim string's `\"`
-							idx += 2; // skip next `"` as well
+						if (verbatim && code[idx + 1] == '"') { // '""' is verbatim string's '\"'
+							idx += 2; // skip next '"' as well
 							continue;
 						}
 
@@ -590,7 +590,7 @@ Error ScriptClassParser::parse(const String &p_code) {
 					name = String(value);
 				} else if (tk == TK_CURLY_BRACKET_OPEN) {
 					if (name.empty()) {
-						error_str = "Expected " + get_token_name(TK_IDENTIFIER) + " after keyword `struct`, found " + get_token_name(TK_CURLY_BRACKET_OPEN);
+						error_str = "Expected " + get_token_name(TK_IDENTIFIER) + " after keyword 'struct', found " + get_token_name(TK_CURLY_BRACKET_OPEN);
 						error = true;
 						return ERR_PARSE_ERROR;
 					}
@@ -657,12 +657,12 @@ Error ScriptClassParser::parse_file(const String &p_filepath) {
 	String source;
 
 	Error ferr = read_all_file_utf8(p_filepath, source);
-	if (ferr != OK) {
-		if (ferr == ERR_INVALID_DATA) {
-			ERR_EXPLAIN("File '" + p_filepath + "' contains invalid unicode (utf-8), so it was not loaded. Please ensure that scripts are saved in valid utf-8 unicode.");
-		}
-		ERR_FAIL_V(ferr);
-	}
+
+	ERR_FAIL_COND_V_MSG(ferr != OK, ferr,
+			ferr == ERR_INVALID_DATA ?
+					"File '" + p_filepath + "' contains invalid unicode (UTF-8), so it was not loaded."
+											" Please ensure that scripts are saved in valid UTF-8 unicode." :
+					"Failed to read file: '" + p_filepath + "'.");
 
 	return parse(source);
 }
diff --git a/modules/mono/glue/Managed/Files/AABB.cs b/modules/mono/glue/Managed/Files/AABB.cs
index a2ebbc0736..98a73382f4 100644
--- a/modules/mono/glue/Managed/Files/AABB.cs
+++ b/modules/mono/glue/Managed/Files/AABB.cs
@@ -5,6 +5,7 @@
 // file: core/variant_call.cpp
 // commit: 5ad9be4c24e9d7dc5672fdc42cea896622fe5685
 using System;
+using System.Runtime.InteropServices;
 #if REAL_T_IS_DOUBLE
 using real_t = System.Double;
 #else
@@ -13,6 +14,8 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct AABB : IEquatable<AABB>
     {
         private Vector3 _position;
diff --git a/modules/mono/glue/Managed/Files/Basis.cs b/modules/mono/glue/Managed/Files/Basis.cs
index 9cc31a0557..0eb76e9c63 100644
--- a/modules/mono/glue/Managed/Files/Basis.cs
+++ b/modules/mono/glue/Managed/Files/Basis.cs
@@ -8,43 +8,10 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Basis : IEquatable<Basis>
     {
-        private static readonly Basis identity = new Basis
-        (
-            1f, 0f, 0f,
-            0f, 1f, 0f,
-            0f, 0f, 1f
-        );
-
-        private static readonly Basis[] orthoBases = {
-            new Basis(1f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 1f),
-            new Basis(0f, -1f, 0f, 1f, 0f, 0f, 0f, 0f, 1f),
-            new Basis(-1f, 0f, 0f, 0f, -1f, 0f, 0f, 0f, 1f),
-            new Basis(0f, 1f, 0f, -1f, 0f, 0f, 0f, 0f, 1f),
-            new Basis(1f, 0f, 0f, 0f, 0f, -1f, 0f, 1f, 0f),
-            new Basis(0f, 0f, 1f, 1f, 0f, 0f, 0f, 1f, 0f),
-            new Basis(-1f, 0f, 0f, 0f, 0f, 1f, 0f, 1f, 0f),
-            new Basis(0f, 0f, -1f, -1f, 0f, 0f, 0f, 1f, 0f),
-            new Basis(1f, 0f, 0f, 0f, -1f, 0f, 0f, 0f, -1f),
-            new Basis(0f, 1f, 0f, 1f, 0f, 0f, 0f, 0f, -1f),
-            new Basis(-1f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, -1f),
-            new Basis(0f, -1f, 0f, -1f, 0f, 0f, 0f, 0f, -1f),
-            new Basis(1f, 0f, 0f, 0f, 0f, 1f, 0f, -1f, 0f),
-            new Basis(0f, 0f, -1f, 1f, 0f, 0f, 0f, -1f, 0f),
-            new Basis(-1f, 0f, 0f, 0f, 0f, -1f, 0f, -1f, 0f),
-            new Basis(0f, 0f, 1f, -1f, 0f, 0f, 0f, -1f, 0f),
-            new Basis(0f, 0f, 1f, 0f, 1f, 0f, -1f, 0f, 0f),
-            new Basis(0f, -1f, 0f, 0f, 0f, 1f, -1f, 0f, 0f),
-            new Basis(0f, 0f, -1f, 0f, -1f, 0f, -1f, 0f, 0f),
-            new Basis(0f, 1f, 0f, 0f, 0f, -1f, -1f, 0f, 0f),
-            new Basis(0f, 0f, 1f, 0f, -1f, 0f, 1f, 0f, 0f),
-            new Basis(0f, 1f, 0f, 0f, 0f, 1f, 1f, 0f, 0f),
-            new Basis(0f, 0f, -1f, 0f, 1f, 0f, 1f, 0f, 0f),
-            new Basis(0f, -1f, 0f, 0f, 0f, -1f, 1f, 0f, 0f)
-        };
-
         // NOTE: x, y and z are public-only. Use Column0, Column1 and Column2 internally.
 
         /// <summary>
@@ -63,7 +30,6 @@ namespace Godot
         /// </summary>
         public Vector3 y
         {
-
             get => Column1;
             set => Column1 = value;
         }
@@ -74,7 +40,6 @@ namespace Godot
         /// </summary>
         public Vector3 z
         {
-
             get => Column2;
             set => Column2 = value;
         }
@@ -114,8 +79,6 @@ namespace Godot
             }
         }
 
-        public static Basis Identity => identity;
-
         public Vector3 Scale
         {
             get
@@ -225,7 +188,7 @@ namespace Godot
             return orthonormalizedBasis.Quat();
         }
 
-        internal void SetQuantScale(Quat quat, Vector3 scale)
+        internal void SetQuatScale(Quat quat, Vector3 scale)
         {
             SetDiagonal(scale);
             Rotate(quat);
@@ -241,7 +204,6 @@ namespace Godot
             Row0 = new Vector3(diagonal.x, 0, 0);
             Row1 = new Vector3(0, diagonal.y, 0);
             Row2 = new Vector3(0, 0, diagonal.z);
-
         }
 
         public real_t Determinant()
@@ -361,7 +323,7 @@ namespace Godot
 
             for (int i = 0; i < 24; i++)
             {
-                if (orthoBases[i] == orth)
+                if (orth == _orthoBases[i])
                     return i;
             }
 
@@ -531,6 +493,43 @@ namespace Godot
             }
         }
 
+        private static readonly Basis[] _orthoBases = {
+            new Basis(1f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 1f),
+            new Basis(0f, -1f, 0f, 1f, 0f, 0f, 0f, 0f, 1f),
+            new Basis(-1f, 0f, 0f, 0f, -1f, 0f, 0f, 0f, 1f),
+            new Basis(0f, 1f, 0f, -1f, 0f, 0f, 0f, 0f, 1f),
+            new Basis(1f, 0f, 0f, 0f, 0f, -1f, 0f, 1f, 0f),
+            new Basis(0f, 0f, 1f, 1f, 0f, 0f, 0f, 1f, 0f),
+            new Basis(-1f, 0f, 0f, 0f, 0f, 1f, 0f, 1f, 0f),
+            new Basis(0f, 0f, -1f, -1f, 0f, 0f, 0f, 1f, 0f),
+            new Basis(1f, 0f, 0f, 0f, -1f, 0f, 0f, 0f, -1f),
+            new Basis(0f, 1f, 0f, 1f, 0f, 0f, 0f, 0f, -1f),
+            new Basis(-1f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, -1f),
+            new Basis(0f, -1f, 0f, -1f, 0f, 0f, 0f, 0f, -1f),
+            new Basis(1f, 0f, 0f, 0f, 0f, 1f, 0f, -1f, 0f),
+            new Basis(0f, 0f, -1f, 1f, 0f, 0f, 0f, -1f, 0f),
+            new Basis(-1f, 0f, 0f, 0f, 0f, -1f, 0f, -1f, 0f),
+            new Basis(0f, 0f, 1f, -1f, 0f, 0f, 0f, -1f, 0f),
+            new Basis(0f, 0f, 1f, 0f, 1f, 0f, -1f, 0f, 0f),
+            new Basis(0f, -1f, 0f, 0f, 0f, 1f, -1f, 0f, 0f),
+            new Basis(0f, 0f, -1f, 0f, -1f, 0f, -1f, 0f, 0f),
+            new Basis(0f, 1f, 0f, 0f, 0f, -1f, -1f, 0f, 0f),
+            new Basis(0f, 0f, 1f, 0f, -1f, 0f, 1f, 0f, 0f),
+            new Basis(0f, 1f, 0f, 0f, 0f, 1f, 1f, 0f, 0f),
+            new Basis(0f, 0f, -1f, 0f, 1f, 0f, 1f, 0f, 0f),
+            new Basis(0f, -1f, 0f, 0f, 0f, -1f, 1f, 0f, 0f)
+        };
+
+        private static readonly Basis _identity = new Basis(1, 0, 0, 0, 1, 0, 0, 0, 1);
+        private static readonly Basis _flipX = new Basis(-1, 0, 0, 0, 1, 0, 0, 0, 1);
+        private static readonly Basis _flipY = new Basis(1, 0, 0, 0, -1, 0, 0, 0, 1);
+        private static readonly Basis _flipZ = new Basis(1, 0, 0, 0, 1, 0, 0, 0, -1);
+
+        public static Basis Identity { get { return _identity; } }
+        public static Basis FlipX { get { return _flipX; } }
+        public static Basis FlipY { get { return _flipY; } }
+        public static Basis FlipZ { get { return _flipZ; } }
+
         public Basis(Quat quat)
         {
             real_t s = 2.0f / quat.LengthSquared;
diff --git a/modules/mono/glue/Managed/Files/Color.cs b/modules/mono/glue/Managed/Files/Color.cs
index 84ff19fc54..3a52a1a13b 100644
--- a/modules/mono/glue/Managed/Files/Color.cs
+++ b/modules/mono/glue/Managed/Files/Color.cs
@@ -1,7 +1,10 @@
 using System;
+using System.Runtime.InteropServices;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct Color : IEquatable<Color>
     {
         public float r;
@@ -13,7 +16,11 @@ namespace Godot
         {
             get
             {
-                return (int)(r * 255.0f);
+                return (int)Math.Round(r * 255.0f);
+            }
+            set
+            {
+                r = value / 255.0f;
             }
         }
 
@@ -21,7 +28,11 @@ namespace Godot
         {
             get
             {
-                return (int)(g * 255.0f);
+                return (int)Math.Round(g * 255.0f);
+            }
+            set
+            {
+                g = value / 255.0f;
             }
         }
 
@@ -29,7 +40,11 @@ namespace Godot
         {
             get
             {
-                return (int)(b * 255.0f);
+                return (int)Math.Round(b * 255.0f);
+            }
+            set
+            {
+                b = value / 255.0f;
             }
         }
 
@@ -37,7 +52,11 @@ namespace Godot
         {
             get
             {
-                return (int)(a * 255.0f);
+                return (int)Math.Round(a * 255.0f);
+            }
+            set
+            {
+                a = value / 255.0f;
             }
         }
 
@@ -71,7 +90,7 @@ namespace Godot
             }
             set
             {
-                this = FromHsv(value, s, v);
+                this = FromHsv(value, s, v, a);
             }
         }
 
@@ -88,7 +107,7 @@ namespace Godot
             }
             set
             {
-                this = FromHsv(h, value, v);
+                this = FromHsv(h, value, v, a);
             }
         }
 
@@ -100,7 +119,7 @@ namespace Godot
             }
             set
             {
-                this = FromHsv(h, s, value);
+                this = FromHsv(h, s, value, a);
             }
         }
 
@@ -163,12 +182,12 @@ namespace Godot
             }
         }
 
-        public static void ToHsv(Color color, out float hue, out float saturation, out float value)
+        public void ToHsv(out float hue, out float saturation, out float value)
         {
-            int max = Mathf.Max(color.r8, Mathf.Max(color.g8, color.b8));
-            int min = Mathf.Min(color.r8, Mathf.Min(color.g8, color.b8));
+            float max = (float)Mathf.Max(r, Mathf.Max(g, b));
+            float min = (float)Mathf.Min(r, Mathf.Min(g, b));
 
-            int delta = max - min;
+            float delta = max - min;
 
             if (delta == 0)
             {
@@ -176,12 +195,12 @@ namespace Godot
             }
             else
             {
-                if (color.r == max)
-                    hue = (color.g - color.b) / delta; // Between yellow & magenta
-                else if (color.g == max)
-                    hue = 2 + (color.b - color.r) / delta; // Between cyan & yellow
+                if (r == max)
+                    hue = (g - b) / delta; // Between yellow & magenta
+                else if (g == max)
+                    hue = 2 + (b - r) / delta; // Between cyan & yellow
                 else
-                    hue = 4 + (color.r - color.g) / delta; // Between magenta & cyan
+                    hue = 4 + (r - g) / delta; // Between magenta & cyan
 
                 hue /= 6.0f;
 
@@ -190,7 +209,7 @@ namespace Godot
             }
 
             saturation = max == 0 ? 0 : 1f - 1f * min / max;
-            value = max / 255f;
+            value = max;
         }
 
         public static Color FromHsv(float hue, float saturation, float value, float alpha = 1.0f)
@@ -254,7 +273,8 @@ namespace Godot
             return new Color(
                 (r + 0.5f) % 1.0f,
                 (g + 0.5f) % 1.0f,
-                (b + 0.5f) % 1.0f
+                (b + 0.5f) % 1.0f,
+                a
             );
         }
 
@@ -272,7 +292,8 @@ namespace Godot
             return new Color(
                 1.0f - r,
                 1.0f - g,
-                1.0f - b
+                1.0f - b,
+                a
             );
         }
 
@@ -375,7 +396,7 @@ namespace Godot
             return c;
         }
 
-        public string ToHtml(bool include_alpha = true)
+        public string ToHtml(bool includeAlpha = true)
         {
             var txt = string.Empty;
 
@@ -383,7 +404,7 @@ namespace Godot
             txt += ToHex32(g);
             txt += ToHex32(b);
 
-            if (include_alpha)
+            if (includeAlpha)
                 txt = ToHex32(a) + txt;
 
             return txt;
@@ -465,13 +486,13 @@ namespace Godot
 
             for (int i = 0; i < 2; i++)
             {
-                char[] c = { (char)0, (char)0 };
+                char c;
                 int lv = v & 0xF;
 
                 if (lv < 10)
-                    c[0] = (char)('0' + lv);
+                    c = (char)('0' + lv);
                 else
-                    c[0] = (char)('a' + lv - 10);
+                    c = (char)('a' + lv - 10);
 
                 v >>= 4;
                 ret = c + ret;
@@ -490,12 +511,17 @@ namespace Godot
 
             bool alpha;
 
-            if (color.Length == 8)
-                alpha = true;
-            else if (color.Length == 6)
-                alpha = false;
-            else
-                return false;
+            switch (color.Length)
+            {
+                case 8:
+                    alpha = true;
+                    break;
+                case 6:
+                    alpha = false;
+                    break;
+                default:
+                    return false;
+            }
 
             if (alpha)
             {
diff --git a/modules/mono/glue/Managed/Files/Colors.cs b/modules/mono/glue/Managed/Files/Colors.cs
index bc2a1a3bd7..f41f5e9fc8 100644
--- a/modules/mono/glue/Managed/Files/Colors.cs
+++ b/modules/mono/glue/Managed/Files/Colors.cs
@@ -141,6 +141,7 @@ namespace Godot
             {"teal", new Color(0.00f, 0.50f, 0.50f)},
             {"thistle", new Color(0.85f, 0.75f, 0.85f)},
             {"tomato", new Color(1.00f, 0.39f, 0.28f)},
+            {"transparent", new Color(1.00f, 1.00f, 1.00f, 0.00f)},
             {"turquoise", new Color(0.25f, 0.88f, 0.82f)},
             {"violet", new Color(0.93f, 0.51f, 0.93f)},
             {"webgreen", new Color(0.00f, 0.50f, 0.00f)},
@@ -187,7 +188,7 @@ namespace Godot
         public static Color DarkOrchid { get { return namedColors["darkorchid"]; } }
         public static Color DarkRed { get { return namedColors["darkred"]; } }
         public static Color DarkSalmon { get { return namedColors["darksalmon"]; } }
-        public static Color DarkSeagreen { get { return namedColors["darkseagreen"]; } }
+        public static Color DarkSeaGreen { get { return namedColors["darkseagreen"]; } }
         public static Color DarkSlateBlue { get { return namedColors["darkslateblue"]; } }
         public static Color DarkSlateGray { get { return namedColors["darkslategray"]; } }
         public static Color DarkTurquoise { get { return namedColors["darkturquoise"]; } }
@@ -288,6 +289,7 @@ namespace Godot
         public static Color Teal { get { return namedColors["teal"]; } }
         public static Color Thistle { get { return namedColors["thistle"]; } }
         public static Color Tomato { get { return namedColors["tomato"]; } }
+        public static Color Transparent { get { return namedColors["transparent"]; } }
         public static Color Turquoise { get { return namedColors["turquoise"]; } }
         public static Color Violet { get { return namedColors["violet"]; } }
         public static Color WebGreen { get { return namedColors["webgreen"]; } }
diff --git a/modules/mono/glue/Managed/Files/Dispatcher.cs b/modules/mono/glue/Managed/Files/Dispatcher.cs
new file mode 100644
index 0000000000..072e0f20ff
--- /dev/null
+++ b/modules/mono/glue/Managed/Files/Dispatcher.cs
@@ -0,0 +1,13 @@
+using System.Runtime.CompilerServices;
+
+namespace Godot
+{
+    public static class Dispatcher
+    {
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        private static extern GodotTaskScheduler godot_icall_DefaultGodotTaskScheduler();
+
+        public static GodotSynchronizationContext SynchronizationContext =>
+            godot_icall_DefaultGodotTaskScheduler().Context;
+    }
+}
diff --git a/modules/mono/glue/Managed/Files/GodotSynchronizationContext.cs b/modules/mono/glue/Managed/Files/GodotSynchronizationContext.cs
index e727781d63..4b5e3f8761 100644
--- a/modules/mono/glue/Managed/Files/GodotSynchronizationContext.cs
+++ b/modules/mono/glue/Managed/Files/GodotSynchronizationContext.cs
@@ -6,17 +6,16 @@ namespace Godot
 {
     public class GodotSynchronizationContext : SynchronizationContext
     {
-        private readonly BlockingCollection<KeyValuePair<SendOrPostCallback, object>> queue = new BlockingCollection<KeyValuePair<SendOrPostCallback, object>>();
+        private readonly BlockingCollection<KeyValuePair<SendOrPostCallback, object>> _queue = new BlockingCollection<KeyValuePair<SendOrPostCallback, object>>();
 
         public override void Post(SendOrPostCallback d, object state)
         {
-            queue.Add(new KeyValuePair<SendOrPostCallback, object>(d, state));
+            _queue.Add(new KeyValuePair<SendOrPostCallback, object>(d, state));
         }
 
         public void ExecutePendingContinuations()
         {
-            KeyValuePair<SendOrPostCallback, object> workItem;
-            while (queue.TryTake(out workItem))
+            while (_queue.TryTake(out var workItem))
             {
                 workItem.Key(workItem.Value);
             }
diff --git a/modules/mono/glue/Managed/Files/GodotTaskScheduler.cs b/modules/mono/glue/Managed/Files/GodotTaskScheduler.cs
index 9a40fef5a9..8eaeea50dc 100644
--- a/modules/mono/glue/Managed/Files/GodotTaskScheduler.cs
+++ b/modules/mono/glue/Managed/Files/GodotTaskScheduler.cs
@@ -8,7 +8,7 @@ namespace Godot
 {
     public class GodotTaskScheduler : TaskScheduler
     {
-        private GodotSynchronizationContext Context { get; set; }
+        internal GodotSynchronizationContext Context { get; }
         private readonly LinkedList<Task> _tasks = new LinkedList<Task>();
 
         public GodotTaskScheduler()
@@ -28,14 +28,10 @@ namespace Godot
         protected sealed override bool TryExecuteTaskInline(Task task, bool taskWasPreviouslyQueued)
         {
             if (SynchronizationContext.Current != Context)
-            {
                 return false;
-            }
 
             if (taskWasPreviouslyQueued)
-            {
                 TryDequeue(task);
-            }
 
             return TryExecuteTask(task);
         }
@@ -52,7 +48,8 @@ namespace Godot
         {
             lock (_tasks)
             {
-                return _tasks.ToArray();
+                foreach (Task task in _tasks)
+                    yield return task;
             }
         }
 
diff --git a/modules/mono/glue/Managed/Files/Mathf.cs b/modules/mono/glue/Managed/Files/Mathf.cs
index 6c1a51fcf9..ce34cd6a99 100644
--- a/modules/mono/glue/Managed/Files/Mathf.cs
+++ b/modules/mono/glue/Managed/Files/Mathf.cs
@@ -158,6 +158,11 @@ namespace Godot
 
         public static bool IsEqualApprox(real_t a, real_t b)
         {
+            // Check for exact equality first, required to handle "infinity" values.
+            if (a == b) {
+                return true;
+            }
+            // Then check for approximate equality.
             real_t tolerance = Epsilon * Abs(a);
             if (tolerance < Epsilon) {
                 tolerance = Epsilon;
@@ -336,14 +341,14 @@ namespace Godot
 
         public static int Wrap(int value, int min, int max)
         {
-            int rng = max - min;
-            return rng != 0 ? min + ((value - min) % rng + rng) % rng : min;
+            int range = max - min;
+            return range == 0 ? min : min + ((value - min) % range + range) % range;
         }
 
         public static real_t Wrap(real_t value, real_t min, real_t max)
         {
-            real_t rng = max - min;
-            return !IsEqualApprox(rng, default(real_t)) ? min + ((value - min) % rng + rng) % rng : min;
+            real_t range = max - min;
+            return IsZeroApprox(range) ? min : min + ((value - min) % range + range) % range;
         }
     }
 }
diff --git a/modules/mono/glue/Managed/Files/MathfEx.cs b/modules/mono/glue/Managed/Files/MathfEx.cs
index b96f01bc2e..6cffc7f01d 100644
--- a/modules/mono/glue/Managed/Files/MathfEx.cs
+++ b/modules/mono/glue/Managed/Files/MathfEx.cs
@@ -48,7 +48,12 @@ namespace Godot
 
         public static bool IsEqualApprox(real_t a, real_t b, real_t tolerance)
         {
+            // Check for exact equality first, required to handle "infinity" values.
+            if (a == b) {
+                return true;
+            }
+            // Then check for approximate equality.
             return Abs(a - b) < tolerance;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/modules/mono/glue/Managed/Files/NodePath.cs b/modules/mono/glue/Managed/Files/NodePath.cs
index 94a4ed1de9..4de4e1e6a9 100644
--- a/modules/mono/glue/Managed/Files/NodePath.cs
+++ b/modules/mono/glue/Managed/Files/NodePath.cs
@@ -55,7 +55,7 @@ namespace Godot
             get { return ptr; }
         }
 
-        public NodePath() : this(string.Empty) { }
+        public NodePath() : this(string.Empty) {}
 
         public NodePath(string path)
         {
diff --git a/modules/mono/glue/Managed/Files/Plane.cs b/modules/mono/glue/Managed/Files/Plane.cs
index e16d4315be..a13161d2e6 100644
--- a/modules/mono/glue/Managed/Files/Plane.cs
+++ b/modules/mono/glue/Managed/Files/Plane.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Runtime.InteropServices;
 #if REAL_T_IS_DOUBLE
 using real_t = System.Double;
 #else
@@ -7,6 +8,8 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct Plane : IEquatable<Plane>
     {
         private Vector3 _normal;
diff --git a/modules/mono/glue/Managed/Files/Quat.cs b/modules/mono/glue/Managed/Files/Quat.cs
index 0d4349084a..845c7c730e 100644
--- a/modules/mono/glue/Managed/Files/Quat.cs
+++ b/modules/mono/glue/Managed/Files/Quat.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Quat : IEquatable<Quat>
     {
@@ -95,6 +96,7 @@ namespace Godot
             return this / Length;
         }
 
+        [Obsolete("Set is deprecated. Use the Quat(" + nameof(real_t) + ", " + nameof(real_t) + ", " + nameof(real_t) + ", " + nameof(real_t) + ") constructor instead.", error: true)]
         public void Set(real_t x, real_t y, real_t z, real_t w)
         {
             this.x = x;
@@ -103,16 +105,19 @@ namespace Godot
             this.w = w;
         }
 
+        [Obsolete("Set is deprecated. Use the Quat(" + nameof(Quat) + ") constructor instead.", error: true)]
         public void Set(Quat q)
         {
             this = q;
         }
 
+        [Obsolete("SetAxisAngle is deprecated. Use the Quat(" + nameof(Vector3) + ", " + nameof(real_t) + ") constructor instead.", error: true)]
         public void SetAxisAngle(Vector3 axis, real_t angle)
         {
             this = new Quat(axis, angle);
         }
 
+        [Obsolete("SetEuler is deprecated. Use the Quat(" + nameof(Vector3) + ") constructor instead.", error: true)]
         public void SetEuler(Vector3 eulerYXZ)
         {
             this = new Quat(eulerYXZ);
@@ -229,9 +234,9 @@ namespace Godot
 
         public Quat(Vector3 eulerYXZ)
         {
-            real_t half_a1 = eulerYXZ.y * (real_t)0.5;
-            real_t half_a2 = eulerYXZ.x * (real_t)0.5;
-            real_t half_a3 = eulerYXZ.z * (real_t)0.5;
+            real_t half_a1 = eulerYXZ.y * 0.5f;
+            real_t half_a2 = eulerYXZ.x * 0.5f;
+            real_t half_a3 = eulerYXZ.z * 0.5f;
 
             // R = Y(a1).X(a2).Z(a3) convention for Euler angles.
             // Conversion to quaternion as listed in https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19770024290.pdf (page A-6)
@@ -246,7 +251,7 @@ namespace Godot
 
             x = sin_a1 * cos_a2 * sin_a3 + cos_a1 * sin_a2 * cos_a3;
             y = sin_a1 * cos_a2 * cos_a3 - cos_a1 * sin_a2 * sin_a3;
-            z = -sin_a1 * sin_a2 * cos_a3 + cos_a1 * cos_a2 * sin_a3;
+            z = cos_a1 * cos_a2 * sin_a3 - sin_a1 * sin_a2 * cos_a3;
             w = sin_a1 * sin_a2 * sin_a3 + cos_a1 * cos_a2 * cos_a3;
         }
 
diff --git a/modules/mono/glue/Managed/Files/Rect2.cs b/modules/mono/glue/Managed/Files/Rect2.cs
index 888f300347..f3dc9d8490 100644
--- a/modules/mono/glue/Managed/Files/Rect2.cs
+++ b/modules/mono/glue/Managed/Files/Rect2.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Rect2 : IEquatable<Rect2>
     {
diff --git a/modules/mono/glue/Managed/Files/StringExtensions.cs b/modules/mono/glue/Managed/Files/StringExtensions.cs
index b43034fbb5..6045c83e95 100644
--- a/modules/mono/glue/Managed/Files/StringExtensions.cs
+++ b/modules/mono/glue/Managed/Files/StringExtensions.cs
@@ -98,6 +98,66 @@ namespace Godot
         }
 
         // <summary>
+        // Return the amount of substrings in string.
+        // </summary>
+        public static int Count(this string instance, string what, bool caseSensitive = true, int from = 0, int to = 0)
+        {
+            if (what.Length == 0)
+            {
+                return 0;
+            }
+
+            int len = instance.Length;
+            int slen = what.Length;
+
+            if (len < slen)
+            {
+                return 0;
+            }
+
+            string str;
+
+            if (from >= 0 && to >= 0)
+            {
+                if (to == 0)
+                {
+                    to = len;
+                }
+                else if (from >= to)
+                {
+                    return 0;
+                }
+                if (from == 0 && to == len)
+                {
+                    str = instance;
+                }
+                else
+                {
+                    str = instance.Substring(from, to - from);
+                }
+            }
+            else
+            {
+                return 0;
+            }
+
+            int c = 0;
+            int idx;
+
+            do
+            {
+                idx = str.IndexOf(what, caseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase);
+                if (idx != -1)
+                {
+                    str = str.Substring(idx + slen);
+                    ++c;
+                }
+            } while (idx != -1);
+
+            return c;
+        }
+
+        // <summary>
         // Return a copy of the string with special characters escaped using the C language standard.
         // </summary>
         public static string CEscape(this string instance)
diff --git a/modules/mono/glue/Managed/Files/Transform.cs b/modules/mono/glue/Managed/Files/Transform.cs
index bd79144873..cc4d26158d 100644
--- a/modules/mono/glue/Managed/Files/Transform.cs
+++ b/modules/mono/glue/Managed/Files/Transform.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Transform : IEquatable<Transform>
     {
@@ -33,7 +34,7 @@ namespace Godot
             Vector3 destinationLocation = transform.origin;
 
             var interpolated = new Transform();
-            interpolated.basis.SetQuantScale(sourceRotation.Slerp(destinationRotation, c).Normalized(), sourceScale.LinearInterpolate(destinationScale, c));
+            interpolated.basis.SetQuatScale(sourceRotation.Slerp(destinationRotation, c).Normalized(), sourceScale.LinearInterpolate(destinationScale, c));
             interpolated.origin = sourceLocation.LinearInterpolate(destinationLocation, c);
 
             return interpolated;
diff --git a/modules/mono/glue/Managed/Files/Transform2D.cs b/modules/mono/glue/Managed/Files/Transform2D.cs
index 33ff286769..814332dc07 100644
--- a/modules/mono/glue/Managed/Files/Transform2D.cs
+++ b/modules/mono/glue/Managed/Files/Transform2D.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Transform2D : IEquatable<Transform2D>
     {
@@ -98,6 +99,8 @@ namespace Godot
                         return x[columnIndex];
                     case 1:
                         return y[columnIndex];
+                    case 2:
+                        return origin[columnIndex];
                     default:
                         throw new IndexOutOfRangeException();
                 }
@@ -112,6 +115,9 @@ namespace Godot
                     case 1:
                         y[columnIndex] = value;
                         return;
+                    case 2:
+                        origin[columnIndex] = value;
+                        return;
                     default:
                         throw new IndexOutOfRangeException();
                 }
@@ -136,7 +142,7 @@ namespace Godot
             inv[0] *= new Vector2(detInv, -detInv);
             inv[1] *= new Vector2(-detInv, detInv);
 
-            inv[2] = BasisXform(-inv[2]);
+            inv[2] = inv.BasisXform(-inv[2]);
 
             return inv;
         }
diff --git a/modules/mono/glue/Managed/Files/Vector2.cs b/modules/mono/glue/Managed/Files/Vector2.cs
index a7f26283a7..0daa94057e 100644
--- a/modules/mono/glue/Managed/Files/Vector2.cs
+++ b/modules/mono/glue/Managed/Files/Vector2.cs
@@ -14,9 +14,19 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    /// <summary>
+    /// 2-element structure that can be used to represent positions in 2D space or any other pair of numeric values.
+    /// </summary>
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector2 : IEquatable<Vector2>
     {
+        public enum Axis
+        {
+            X = 0,
+            Y
+        }
+
         public real_t x;
         public real_t y;
 
@@ -201,6 +211,22 @@ namespace Godot
             return v;
         }
 
+        public Vector2 PosMod(real_t mod)
+        {
+            Vector2 v;
+            v.x = Mathf.PosMod(x, mod);
+            v.y = Mathf.PosMod(y, mod);
+            return v;
+        }
+
+        public Vector2 PosMod(Vector2 modv)
+        {
+            Vector2 v;
+            v.x = Mathf.PosMod(x, modv.x);
+            v.y = Mathf.PosMod(y, modv.y);
+            return v;
+        }
+
         public Vector2 Project(Vector2 onNormal)
         {
             return onNormal * (Dot(onNormal) / onNormal.LengthSquared());
@@ -222,17 +248,27 @@ namespace Godot
             return new Vector2(Mathf.Round(x), Mathf.Round(y));
         }
 
+        [Obsolete("Set is deprecated. Use the Vector2(" + nameof(real_t) + ", " + nameof(real_t) + ") constructor instead.", error: true)]
         public void Set(real_t x, real_t y)
         {
             this.x = x;
             this.y = y;
         }
+        [Obsolete("Set is deprecated. Use the Vector2(" + nameof(Vector2) + ") constructor instead.", error: true)]
         public void Set(Vector2 v)
         {
             x = v.x;
             y = v.y;
         }
 
+        public Vector2 Sign()
+        {
+            Vector2 v;
+            v.x = Mathf.Sign(x);
+            v.y = Mathf.Sign(y);
+            return v;
+        }
+
         public Vector2 Slerp(Vector2 b, real_t t)
         {
             real_t theta = AngleTo(b);
@@ -262,7 +298,7 @@ namespace Godot
 
         private static readonly Vector2 _up = new Vector2(0, -1);
         private static readonly Vector2 _down = new Vector2(0, 1);
-        private static readonly Vector2 _right  = new Vector2(1, 0);
+        private static readonly Vector2 _right = new Vector2(1, 0);
         private static readonly Vector2 _left = new Vector2(-1, 0);
 
         public static Vector2 Zero { get { return _zero; } }
@@ -343,6 +379,20 @@ namespace Godot
             return left;
         }
 
+        public static Vector2 operator %(Vector2 vec, real_t divisor)
+        {
+            vec.x %= divisor;
+            vec.y %= divisor;
+            return vec;
+        }
+
+        public static Vector2 operator %(Vector2 vec, Vector2 divisorv)
+        {
+            vec.x %= divisorv.x;
+            vec.y %= divisorv.y;
+            return vec;
+        }
+
         public static bool operator ==(Vector2 left, Vector2 right)
         {
             return left.Equals(right);
diff --git a/modules/mono/glue/Managed/Files/Vector3.cs b/modules/mono/glue/Managed/Files/Vector3.cs
index 16803ae55c..9076dbd3b0 100644
--- a/modules/mono/glue/Managed/Files/Vector3.cs
+++ b/modules/mono/glue/Managed/Files/Vector3.cs
@@ -14,6 +14,10 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    /// <summary>
+    /// 3-element structure that can be used to represent positions in 3D space or any other pair of numeric values.
+    /// </summary>
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector3 : IEquatable<Vector3>
     {
@@ -224,6 +228,24 @@ namespace Godot
             );
         }
 
+        public Vector3 PosMod(real_t mod)
+        {
+            Vector3 v;
+            v.x = Mathf.PosMod(x, mod);
+            v.y = Mathf.PosMod(y, mod);
+            v.z = Mathf.PosMod(z, mod);
+            return v;
+        }
+
+        public Vector3 PosMod(Vector3 modv)
+        {
+            Vector3 v;
+            v.x = Mathf.PosMod(x, modv.x);
+            v.y = Mathf.PosMod(y, modv.y);
+            v.z = Mathf.PosMod(z, modv.z);
+            return v;
+        }
+
         public Vector3 Project(Vector3 onNormal)
         {
             return onNormal * (Dot(onNormal) / onNormal.LengthSquared());
@@ -248,12 +270,14 @@ namespace Godot
             return new Basis(axis, phi).Xform(this);
         }
 
+        [Obsolete("Set is deprecated. Use the Vector3(" + nameof(real_t) + ", " + nameof(real_t) + ", " + nameof(real_t) + ") constructor instead.", error: true)]
         public void Set(real_t x, real_t y, real_t z)
         {
             this.x = x;
             this.y = y;
             this.z = z;
         }
+        [Obsolete("Set is deprecated. Use the Vector3(" + nameof(Vector3) + ") constructor instead.", error: true)]
         public void Set(Vector3 v)
         {
             x = v.x;
@@ -261,6 +285,15 @@ namespace Godot
             z = v.z;
         }
 
+        public Vector3 Sign()
+        {
+            Vector3 v;
+            v.x = Mathf.Sign(x);
+            v.y = Mathf.Sign(y);
+            v.z = Mathf.Sign(z);
+            return v;
+        }
+
         public Vector3 Slerp(Vector3 b, real_t t)
         {
             real_t theta = AngleTo(b);
@@ -394,6 +427,22 @@ namespace Godot
             return left;
         }
 
+        public static Vector3 operator %(Vector3 vec, real_t divisor)
+        {
+            vec.x %= divisor;
+            vec.y %= divisor;
+            vec.z %= divisor;
+            return vec;
+        }
+
+        public static Vector3 operator %(Vector3 vec, Vector3 divisorv)
+        {
+            vec.x %= divisorv.x;
+            vec.y %= divisorv.y;
+            vec.z %= divisorv.z;
+            return vec;
+        }
+
         public static bool operator ==(Vector3 left, Vector3 right)
         {
             return left.Equals(right);
diff --git a/modules/mono/glue/Managed/Managed.csproj b/modules/mono/glue/Managed/Managed.csproj
index 61f738922b..c8eca71199 100644
--- a/modules/mono/glue/Managed/Managed.csproj
+++ b/modules/mono/glue/Managed/Managed.csproj
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -8,6 +8,7 @@
     <RootNamespace>Managed</RootNamespace>
     <AssemblyName>Managed</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <LangVersion>7</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
@@ -37,4 +38,4 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
-</Project>
+</Project>
\ No newline at end of file
diff --git a/modules/mono/glue/gd_glue.cpp b/modules/mono/glue/gd_glue.cpp
index 7c30092855..8b9a1380d8 100644
--- a/modules/mono/glue/gd_glue.cpp
+++ b/modules/mono/glue/gd_glue.cpp
@@ -167,7 +167,7 @@ MonoObject *godot_icall_GD_str2var(MonoString *p_str) {
 	int line;
 	Error err = VariantParser::parse(&ss, ret, errs, line);
 	if (err != OK) {
-		String err_str = "Parse error at line " + itos(line) + ": " + errs;
+		String err_str = "Parse error at line " + itos(line) + ": " + errs + ".";
 		ERR_PRINTS(err_str);
 		ret = err_str;
 	}
@@ -193,8 +193,7 @@ MonoArray *godot_icall_GD_var2bytes(MonoObject *p_var, MonoBoolean p_full_object
 	PoolByteArray barr;
 	int len;
 	Error err = encode_variant(var, NULL, len, p_full_objects);
-	ERR_EXPLAIN("Unexpected error encoding variable to bytes, likely unserializable type found (Object or RID).");
-	ERR_FAIL_COND_V(err != OK, NULL);
+	ERR_FAIL_COND_V_MSG(err != OK, NULL, "Unexpected error encoding variable to bytes, likely unserializable type found (Object or RID).");
 
 	barr.resize(len);
 	{
@@ -211,6 +210,10 @@ MonoString *godot_icall_GD_var2str(MonoObject *p_var) {
 	return GDMonoMarshal::mono_string_from_godot(vars);
 }
 
+MonoObject *godot_icall_DefaultGodotTaskScheduler() {
+	return GDMonoUtils::mono_cache.task_scheduler_handle->get_target();
+}
+
 void godot_register_gd_icalls() {
 	mono_add_internal_call("Godot.GD::godot_icall_GD_bytes2var", (void *)godot_icall_GD_bytes2var);
 	mono_add_internal_call("Godot.GD::godot_icall_GD_convert", (void *)godot_icall_GD_convert);
@@ -234,6 +237,9 @@ void godot_register_gd_icalls() {
 	mono_add_internal_call("Godot.GD::godot_icall_GD_type_exists", (void *)godot_icall_GD_type_exists);
 	mono_add_internal_call("Godot.GD::godot_icall_GD_var2bytes", (void *)godot_icall_GD_var2bytes);
 	mono_add_internal_call("Godot.GD::godot_icall_GD_var2str", (void *)godot_icall_GD_var2str);
+
+	// Dispatcher
+	mono_add_internal_call("Godot.Dispatcher::godot_icall_DefaultGodotTaskScheduler", (void *)godot_icall_DefaultGodotTaskScheduler);
 }
 
 #endif // MONO_GLUE_ENABLED
diff --git a/modules/mono/glue/gd_glue.h b/modules/mono/glue/gd_glue.h
index d4e20e2887..a34c0bc50f 100644
--- a/modules/mono/glue/gd_glue.h
+++ b/modules/mono/glue/gd_glue.h
@@ -75,6 +75,8 @@ MonoArray *godot_icall_GD_var2bytes(MonoObject *p_var, MonoBoolean p_full_object
 
 MonoString *godot_icall_GD_var2str(MonoObject *p_var);
 
+MonoObject *godot_icall_DefaultGodotTaskScheduler();
+
 // Register internal calls
 
 void godot_register_gd_icalls();
diff --git a/modules/mono/godotsharp_defs.h b/modules/mono/godotsharp_defs.h
index 4ad4088514..4c17a6ec9d 100644
--- a/modules/mono/godotsharp_defs.h
+++ b/modules/mono/godotsharp_defs.h
@@ -39,8 +39,8 @@
 #define API_SOLUTION_NAME "GodotSharp"
 #define CORE_API_ASSEMBLY_NAME "GodotSharp"
 #define EDITOR_API_ASSEMBLY_NAME "GodotSharpEditor"
-#define TOOLS_ASSEMBLY_NAME "GodotTools"
-#define TOOLS_PROJECT_EDITOR_ASSEMBLY_NAME "GodotTools.ProjectEditor"
+#define TOOLS_ASM_NAME "GodotTools"
+#define TOOLS_PROJECT_EDITOR_ASM_NAME "GodotTools.ProjectEditor"
 
 #define BINDINGS_CLASS_NATIVECALLS "NativeCalls"
 #define BINDINGS_CLASS_NATIVECALLS_EDITOR "EditorNativeCalls"
diff --git a/modules/mono/icons/icon_c_#.svg b/modules/mono/icons/icon_c_#.svg
new file mode 100644
index 0000000000..69664ca553
--- /dev/null
+++ b/modules/mono/icons/icon_c_#.svg
@@ -0,0 +1,5 @@
+<svg width="16" height="16" version="1.1" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg">
+<g transform="translate(0 -1036.4)">
+<path d="m6 1046.4c-1.6569 0-3 1.3431-3 3s1.3431 3 3 3h1v-2h-1c-0.55228 0-1-0.4478-1-1 0-0.5523 0.44772-1 1-1h1v-2zm1-9-0.56445 2.2578c-0.23643 0.076-0.46689 0.1692-0.68945 0.2793l-1.9883-1.1933-1.4141 1.414 1.1953 1.9942c-0.11191 0.2211-0.20723 0.4502-0.28516 0.6855l-2.2539 0.5625v2h5.2715c-0.17677-0.3037-0.27041-0.6486-0.27148-1 9.6e-6 -1.1046 0.89543-2 2-2s2 0.8954 2 2c-4.817e-4 0.3512-0.093442 0.6961-0.26953 1h5.2695v-2l-2.2578-0.5645c-0.07594-0.2357-0.1693-0.4655-0.2793-0.6875l1.1934-1.9902-1.4141-1.414-1.9941 1.1953c-0.22113-0.1119-0.45028-0.2073-0.68555-0.2852l-0.5625-2.2539zm4 9c-0.71466-1e-4 -1.3751 0.3811-1.7324 1-0.35727 0.6188-0.35727 1.3812 0 2 0.35733 0.6189 1.0178 1.0001 1.7324 1h-2v2h2c0.71466 1e-4 1.3751-0.3811 1.7324-1 0.35727-0.6188 0.35727-1.3812 0-2-0.35733-0.6189-1.0178-1.0001-1.7324-1h2v-2z" fill="#e0e0e0"/>
+</g>
+</svg>
diff --git a/modules/mono/mono_gd/android_mono_config.h b/modules/mono/mono_gd/android_mono_config.h
new file mode 100644
index 0000000000..c5cc244aec
--- /dev/null
+++ b/modules/mono/mono_gd/android_mono_config.h
@@ -0,0 +1,43 @@
+/*************************************************************************/
+/*  android_mono_config.h                                                */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef ANDROID_MONO_CONFIG_H
+#define ANDROID_MONO_CONFIG_H
+
+#ifdef ANDROID_ENABLED
+
+#include "core/ustring.h"
+
+// This function is defined in an auto-generated source file
+String get_godot_android_mono_config();
+
+#endif // ANDROID_ENABLED
+
+#endif // ANDROID_MONO_CONFIG_H
diff --git a/modules/mono/mono_gd/gd_mono.cpp b/modules/mono/mono_gd/gd_mono.cpp
index 2497f083b5..cd111abd4d 100644
--- a/modules/mono/mono_gd/gd_mono.cpp
+++ b/modules/mono/mono_gd/gd_mono.cpp
@@ -56,7 +56,7 @@
 #endif
 
 #ifdef ANDROID_ENABLED
-#include "android_mono_config.gen.h"
+#include "android_mono_config.h"
 #endif
 
 GDMono *GDMono::singleton = NULL;
@@ -265,7 +265,7 @@ void GDMono::initialize() {
 
 #ifdef WINDOWS_ENABLED
 	if (assembly_rootdir.empty() || config_dir.empty()) {
-		ERR_PRINT("Cannot find Mono in the registry");
+		ERR_PRINT("Cannot find Mono in the registry.");
 		// Assertion: if they are not set, then they weren't found in the registry
 		CRASH_COND(mono_reg_info.assembly_dir.length() > 0 || mono_reg_info.config_dir.length() > 0);
 	}
@@ -283,6 +283,18 @@ void GDMono::initialize() {
 
 	add_mono_shared_libs_dir_to_path();
 
+	{
+		PropertyInfo exc_policy_prop = PropertyInfo(Variant::INT, "mono/unhandled_exception_policy", PROPERTY_HINT_ENUM,
+				vformat("Terminate Application:%s,Log Error:%s", (int)POLICY_TERMINATE_APP, (int)POLICY_LOG_ERROR));
+		unhandled_exception_policy = (UnhandledExceptionPolicy)(int)GLOBAL_DEF(exc_policy_prop.name, (int)POLICY_TERMINATE_APP);
+		ProjectSettings::get_singleton()->set_custom_property_info(exc_policy_prop.name, exc_policy_prop);
+
+		if (Engine::get_singleton()->is_editor_hint()) {
+			// Unhandled exceptions should not terminate the editor
+			unhandled_exception_policy = POLICY_LOG_ERROR;
+		}
+	}
+
 	GDMonoAssembly::initialize();
 
 	gdmono_profiler_init();
@@ -305,10 +317,15 @@ void GDMono::initialize() {
 		return;
 #endif
 
-	root_domain = mono_jit_init_version("GodotEngine.RootDomain", "v4.0.30319");
+#if !defined(WINDOWS_ENABLED) && !defined(NO_MONO_THREADS_SUSPEND_WORKAROUND)
+	// FIXME: Temporary workaround. See: https://github.com/godotengine/godot/issues/29812
+	if (!OS::get_singleton()->has_environment("MONO_THREADS_SUSPEND")) {
+		OS::get_singleton()->set_environment("MONO_THREADS_SUSPEND", "preemptive");
+	}
+#endif
 
-	ERR_EXPLAIN("Mono: Failed to initialize runtime");
-	ERR_FAIL_NULL(root_domain);
+	root_domain = mono_jit_init_version("GodotEngine.RootDomain", "v4.0.30319");
+	ERR_FAIL_NULL_MSG(root_domain, "Mono: Failed to initialize runtime.");
 
 	GDMonoUtils::set_main_thread(GDMonoUtils::get_current_thread());
 
@@ -319,11 +336,11 @@ void GDMono::initialize() {
 	print_verbose("Mono: Runtime initialized");
 
 	// mscorlib assembly MUST be present at initialization
-	ERR_EXPLAIN("Mono: Failed to load mscorlib assembly");
-	ERR_FAIL_COND(!_load_corlib_assembly());
+	bool corlib_loaded = _load_corlib_assembly();
+	ERR_FAIL_COND_MSG(!corlib_loaded, "Mono: Failed to load mscorlib assembly.");
 
-	ERR_EXPLAIN("Mono: Failed to load scripts domain");
-	ERR_FAIL_COND(_load_scripts_domain() != OK);
+	Error domain_load_err = _load_scripts_domain();
+	ERR_FAIL_COND_MSG(domain_load_err != OK, "Mono: Failed to load scripts domain.");
 
 #ifdef DEBUG_ENABLED
 	bool debugger_attached = _wait_for_debugger_msecs(500);
@@ -339,8 +356,7 @@ void GDMono::initialize() {
 void GDMono::initialize_load_assemblies() {
 
 #ifndef MONO_GLUE_ENABLED
-	ERR_EXPLAIN("Mono: This binary was built with `mono_glue=no`; cannot load assemblies");
-	CRASH_NOW();
+	CRASH_NOW_MSG("Mono: This binary was built with 'mono_glue=no'; cannot load assemblies.");
 #endif
 
 	// Load assemblies. The API and tools assemblies are required,
@@ -349,10 +365,8 @@ void GDMono::initialize_load_assemblies() {
 	_load_api_assemblies();
 
 #if defined(TOOLS_ENABLED)
-	if (!_load_tools_assemblies()) {
-		ERR_EXPLAIN("Mono: Failed to load GodotTools assemblies");
-		CRASH_NOW();
-	}
+	bool tool_assemblies_loaded = _load_tools_assemblies();
+	CRASH_COND_MSG(!tool_assemblies_loaded, "Mono: Failed to load '" TOOLS_ASM_NAME "' assemblies.");
 #endif
 
 	// Load the project's main assembly. This doesn't necessarily need to succeed.
@@ -416,12 +430,12 @@ void GDMono::_initialize_and_check_api_hashes() {
 
 #ifdef MONO_GLUE_ENABLED
 	if (get_api_core_hash() != GodotSharpBindings::get_core_api_hash()) {
-		ERR_PRINT("Mono: Core API hash mismatch!");
+		ERR_PRINT("Mono: Core API hash mismatch.");
 	}
 
 #ifdef TOOLS_ENABLED
 	if (get_api_editor_hash() != GodotSharpBindings::get_editor_api_hash()) {
-		ERR_PRINT("Mono: Editor API hash mismatch!");
+		ERR_PRINT("Mono: Editor API hash mismatch.");
 	}
 #endif // TOOLS_ENABLED
 #endif // MONO_GLUE_ENABLED
@@ -549,14 +563,14 @@ bool GDMono::_load_corlib_assembly() {
 }
 
 #ifdef TOOLS_ENABLED
-bool GDMono::copy_prebuilt_api_assembly(APIAssembly::Type p_api_type) {
+bool GDMono::copy_prebuilt_api_assembly(APIAssembly::Type p_api_type, const String &p_config) {
 
 	bool &api_assembly_out_of_sync = (p_api_type == APIAssembly::API_CORE) ?
 											 GDMono::get_singleton()->core_api_assembly_out_of_sync :
 											 GDMono::get_singleton()->editor_api_assembly_out_of_sync;
 
-	String src_dir = GodotSharpDirs::get_data_editor_prebuilt_api_dir().plus_file("Debug");
-	String dst_dir = GodotSharpDirs::get_res_assemblies_dir();
+	String src_dir = GodotSharpDirs::get_data_editor_prebuilt_api_dir().plus_file(p_config);
+	String dst_dir = GodotSharpDirs::get_res_assemblies_base_dir().plus_file(p_config);
 
 	String assembly_name = p_api_type == APIAssembly::API_CORE ? CORE_API_ASSEMBLY_NAME : EDITOR_API_ASSEMBLY_NAME;
 
@@ -567,7 +581,7 @@ bool GDMono::copy_prebuilt_api_assembly(APIAssembly::Type p_api_type) {
 		memdelete(da);
 
 		if (err != OK) {
-			ERR_PRINTS("Failed to create destination directory for the API assemblies. Error: " + itos(err));
+			ERR_PRINTS("Failed to create destination directory for the API assemblies. Error: " + itos(err) + ".");
 			return false;
 		}
 	}
@@ -581,16 +595,16 @@ bool GDMono::copy_prebuilt_api_assembly(APIAssembly::Type p_api_type) {
 
 		String xml_file = assembly_name + ".xml";
 		if (da->copy(src_dir.plus_file(xml_file), dst_dir.plus_file(xml_file)) != OK)
-			WARN_PRINTS("Failed to copy " + xml_file);
+			WARN_PRINTS("Failed to copy '" + xml_file + "'.");
 
 		String pdb_file = assembly_name + ".pdb";
 		if (da->copy(src_dir.plus_file(pdb_file), dst_dir.plus_file(pdb_file)) != OK)
-			WARN_PRINTS("Failed to copy " + pdb_file);
+			WARN_PRINTS("Failed to copy '" + pdb_file + "'.");
 
 		Error err = da->copy(assembly_src, assembly_dst);
 
 		if (err != OK) {
-			ERR_PRINTS("Failed to copy " + assembly_file);
+			ERR_PRINTS("Failed to copy '" + assembly_file + "'.");
 			return false;
 		}
 
@@ -602,14 +616,14 @@ bool GDMono::copy_prebuilt_api_assembly(APIAssembly::Type p_api_type) {
 
 String GDMono::update_api_assemblies_from_prebuilt() {
 
-#define FAIL_REASON(m_out_of_sync, m_prebuilt_exist)                             \
+#define FAIL_REASON(m_out_of_sync, m_prebuilt_exists)                            \
 	(                                                                            \
 			(m_out_of_sync ?                                                     \
-							String("The assembly is invalidated") :              \
-							String("The assembly was not found")) +              \
-			(m_prebuilt_exist ?                                                  \
-							String(" and the prebuilt assemblies are missing") : \
-							String(" and we failed to copy the prebuilt assemblies")))
+							String("The assembly is invalidated ") :             \
+							String("The assembly was not found ")) +             \
+			(m_prebuilt_exists ?                                                 \
+							String("and the prebuilt assemblies are missing.") : \
+							String("and we failed to copy the prebuilt assemblies.")))
 
 	bool api_assembly_out_of_sync = core_api_assembly_out_of_sync || editor_api_assembly_out_of_sync;
 
@@ -619,16 +633,28 @@ String GDMono::update_api_assemblies_from_prebuilt() {
 	if (!api_assembly_out_of_sync && FileAccess::exists(core_assembly_path) && FileAccess::exists(editor_assembly_path))
 		return String(); // No update needed
 
-	String prebuilt_api_dir = GodotSharpDirs::get_data_editor_prebuilt_api_dir().plus_file("Debug");
-	String prebuilt_core_dll_path = prebuilt_api_dir.plus_file(CORE_API_ASSEMBLY_NAME ".dll");
-	String prebuilt_editor_dll_path = prebuilt_api_dir.plus_file(EDITOR_API_ASSEMBLY_NAME ".dll");
+	const int CONFIGS_LEN = 2;
+	String configs[CONFIGS_LEN] = { String("Debug"), String("Release") };
 
-	if (!FileAccess::exists(prebuilt_core_dll_path) || !FileAccess::exists(prebuilt_editor_dll_path))
-		return FAIL_REASON(api_assembly_out_of_sync, /* prebuilt_exist: */ false);
+	for (int i = 0; i < CONFIGS_LEN; i++) {
+		String config = configs[i];
 
-	// Copy the prebuilt Api
-	if (!copy_prebuilt_api_assembly(APIAssembly::API_CORE) || !copy_prebuilt_api_assembly(APIAssembly::API_EDITOR))
-		return FAIL_REASON(api_assembly_out_of_sync, /* prebuilt_exist: */ true);
+		print_verbose("Updating '" + config + "' API assemblies");
+
+		String prebuilt_api_dir = GodotSharpDirs::get_data_editor_prebuilt_api_dir().plus_file(config);
+		String prebuilt_core_dll_path = prebuilt_api_dir.plus_file(CORE_API_ASSEMBLY_NAME ".dll");
+		String prebuilt_editor_dll_path = prebuilt_api_dir.plus_file(EDITOR_API_ASSEMBLY_NAME ".dll");
+
+		if (!FileAccess::exists(prebuilt_core_dll_path) || !FileAccess::exists(prebuilt_editor_dll_path)) {
+			return FAIL_REASON(api_assembly_out_of_sync, /* prebuilt_exists: */ false);
+		}
+
+		// Copy the prebuilt Api
+		if (!copy_prebuilt_api_assembly(APIAssembly::API_CORE, config) ||
+				!copy_prebuilt_api_assembly(APIAssembly::API_EDITOR, config)) {
+			return FAIL_REASON(api_assembly_out_of_sync, /* prebuilt_exists: */ true);
+		}
+	}
 
 	return String(); // Updated successfully
 
@@ -643,7 +669,14 @@ bool GDMono::_load_core_api_assembly() {
 
 #ifdef TOOLS_ENABLED
 	// For the editor and the editor player we want to load it from a specific path to make sure we can keep it up to date
-	String assembly_path = GodotSharpDirs::get_res_assemblies_dir().plus_file(CORE_API_ASSEMBLY_NAME ".dll");
+
+	// If running the project manager, load it from the prebuilt API directory
+	String assembly_dir = !Main::is_project_manager() ?
+								  GodotSharpDirs::get_res_assemblies_dir() :
+								  GodotSharpDirs::get_data_editor_prebuilt_api_dir().plus_file("Debug");
+
+	String assembly_path = assembly_dir.plus_file(CORE_API_ASSEMBLY_NAME ".dll");
+
 	bool success = FileAccess::exists(assembly_path) &&
 				   load_assembly_from(CORE_API_ASSEMBLY_NAME, assembly_path, &core_api_assembly);
 #else
@@ -674,7 +707,14 @@ bool GDMono::_load_editor_api_assembly() {
 		return true;
 
 	// For the editor and the editor player we want to load it from a specific path to make sure we can keep it up to date
-	String assembly_path = GodotSharpDirs::get_res_assemblies_dir().plus_file(EDITOR_API_ASSEMBLY_NAME ".dll");
+
+	// If running the project manager, load it from the prebuilt API directory
+	String assembly_dir = !Main::is_project_manager() ?
+								  GodotSharpDirs::get_res_assemblies_dir() :
+								  GodotSharpDirs::get_data_editor_prebuilt_api_dir().plus_file("Debug");
+
+	String assembly_path = assembly_dir.plus_file(EDITOR_API_ASSEMBLY_NAME ".dll");
+
 	bool success = FileAccess::exists(assembly_path) &&
 				   load_assembly_from(EDITOR_API_ASSEMBLY_NAME, assembly_path, &editor_api_assembly);
 
@@ -699,9 +739,6 @@ bool GDMono::_try_load_api_assemblies() {
 		return false;
 	}
 
-	if (core_api_assembly_out_of_sync || !GDMonoUtils::mono_cache.godot_api_cache_updated)
-		return false;
-
 #ifdef TOOLS_ENABLED
 	if (!_load_editor_api_assembly()) {
 		if (OS::get_singleton()->is_stdout_verbose())
@@ -713,6 +750,12 @@ bool GDMono::_try_load_api_assemblies() {
 		return false;
 #endif
 
+	// Check if the core API assembly is out of sync only after trying to load the
+	// editor API assembly. Otherwise, if both assemblies are out of sync, we would
+	// only update the former as we won't know the latter also needs to be updated.
+	if (core_api_assembly_out_of_sync || !GDMonoUtils::mono_cache.godot_api_cache_updated)
+		return false;
+
 	return true;
 }
 
@@ -723,24 +766,20 @@ void GDMono::_load_api_assemblies() {
 		// The API assemblies are out of sync. Fine, try one more time, but this time
 		// update them from the prebuilt assemblies directory before trying to load them.
 
+		// Shouldn't happen. The project manager loads the prebuilt API assemblies
+		CRASH_COND_MSG(Main::is_project_manager(), "Failed to load one of the prebuilt API assemblies.");
+
 		// 1. Unload the scripts domain
-		if (_unload_scripts_domain() != OK) {
-			ERR_EXPLAIN("Mono: Failed to unload scripts domain");
-			CRASH_NOW();
-		}
+		Error domain_unload_err = _unload_scripts_domain();
+		CRASH_COND_MSG(domain_unload_err != OK, "Mono: Failed to unload scripts domain.");
 
 		// 2. Update the API assemblies
 		String update_error = update_api_assemblies_from_prebuilt();
-		if (!update_error.empty()) {
-			ERR_EXPLAIN(update_error);
-			CRASH_NOW();
-		}
+		CRASH_COND_MSG(!update_error.empty(), update_error);
 
 		// 3. Load the scripts domain again
-		if (_load_scripts_domain() != OK) {
-			ERR_EXPLAIN("Mono: Failed to load scripts domain");
-			CRASH_NOW();
-		}
+		Error domain_load_err = _load_scripts_domain();
+		CRASH_COND_MSG(domain_load_err != OK, "Mono: Failed to load scripts domain.");
 
 		// 4. Try loading the updated assemblies
 		if (!_try_load_api_assemblies()) {
@@ -748,24 +787,22 @@ void GDMono::_load_api_assemblies() {
 
 			if (_are_api_assemblies_out_of_sync()) {
 				if (core_api_assembly_out_of_sync) {
-					ERR_PRINT("The assembly '" CORE_API_ASSEMBLY_NAME "' is out of sync");
+					ERR_PRINT("The assembly '" CORE_API_ASSEMBLY_NAME "' is out of sync.");
 				} else if (!GDMonoUtils::mono_cache.godot_api_cache_updated) {
-					ERR_PRINT("The loaded assembly '" CORE_API_ASSEMBLY_NAME "' is in sync, but the cache update failed");
+					ERR_PRINT("The loaded assembly '" CORE_API_ASSEMBLY_NAME "' is in sync, but the cache update failed.");
 				}
 
 				if (editor_api_assembly_out_of_sync) {
-					ERR_PRINT("The assembly '" EDITOR_API_ASSEMBLY_NAME "' is out of sync");
+					ERR_PRINT("The assembly '" EDITOR_API_ASSEMBLY_NAME "' is out of sync.");
 				}
 
 				CRASH_NOW();
 			} else {
-				ERR_EXPLAIN("Failed to load one of the API assemblies");
-				CRASH_NOW();
+				CRASH_NOW_MSG("Failed to load one of the API assemblies.");
 			}
 		}
 #else
-		ERR_EXPLAIN("Failed to load one of the API assemblies");
-		CRASH_NOW();
+		CRASH_NOW_MSG("Failed to load one of the API assemblies.");
 #endif
 	}
 }
@@ -776,8 +813,8 @@ bool GDMono::_load_tools_assemblies() {
 	if (tools_assembly && tools_project_editor_assembly)
 		return true;
 
-	bool success = load_assembly(TOOLS_ASSEMBLY_NAME, &tools_assembly) &&
-				   load_assembly(TOOLS_PROJECT_EDITOR_ASSEMBLY_NAME, &tools_project_editor_assembly);
+	bool success = load_assembly(TOOLS_ASM_NAME, &tools_assembly) &&
+				   load_assembly(TOOLS_PROJECT_EDITOR_ASM_NAME, &tools_project_editor_assembly);
 
 	return success;
 }
@@ -814,7 +851,7 @@ void GDMono::_install_trace_listener() {
 			(DebuggingUtils_InstallTraceListener)debug_utils->get_method_thunk("InstallTraceListener");
 	install_func((MonoObject **)&exc);
 	if (exc) {
-		ERR_PRINT("Failed to install System.Diagnostics.Trace listener");
+		ERR_PRINT("Failed to install 'System.Diagnostics.Trace' listener.");
 		GDMonoUtils::debug_print_unhandled_exception(exc);
 	}
 #endif
@@ -828,8 +865,7 @@ Error GDMono::_load_scripts_domain() {
 
 	scripts_domain = GDMonoUtils::create_domain("GodotEngine.ScriptsDomain");
 
-	ERR_EXPLAIN("Mono: Could not create scripts app domain");
-	ERR_FAIL_NULL_V(scripts_domain, ERR_CANT_CREATE);
+	ERR_FAIL_NULL_V_MSG(scripts_domain, ERR_CANT_CREATE, "Mono: Could not create scripts app domain.");
 
 	mono_domain_set(scripts_domain, true);
 
@@ -848,7 +884,7 @@ Error GDMono::_unload_scripts_domain() {
 	finalizing_scripts_domain = true;
 
 	if (!mono_domain_finalize(scripts_domain, 2000)) {
-		ERR_PRINT("Mono: Domain finalization timeout");
+		ERR_PRINT("Mono: Domain finalization timeout.");
 	}
 
 	finalizing_scripts_domain = false;
@@ -874,7 +910,7 @@ Error GDMono::_unload_scripts_domain() {
 	mono_domain_try_unload(domain, (MonoObject **)&exc);
 
 	if (exc) {
-		ERR_PRINT("Exception thrown when unloading scripts domain");
+		ERR_PRINT("Exception thrown when unloading scripts domain.");
 		GDMonoUtils::debug_unhandled_exception(exc);
 		return FAILED;
 	}
@@ -888,20 +924,14 @@ Error GDMono::reload_scripts_domain() {
 	ERR_FAIL_COND_V(!runtime_initialized, ERR_BUG);
 
 	if (scripts_domain) {
-		Error err = _unload_scripts_domain();
-		if (err != OK) {
-			ERR_PRINT("Mono: Failed to unload scripts domain");
-			return err;
-		}
+		Error domain_unload_err = _unload_scripts_domain();
+		ERR_FAIL_COND_V_MSG(domain_unload_err != OK, domain_unload_err, "Mono: Failed to unload scripts domain.");
 	}
 
 	CSharpLanguage::get_singleton()->_on_scripts_domain_unloaded();
 
-	Error err = _load_scripts_domain();
-	if (err != OK) {
-		ERR_PRINT("Mono: Failed to load scripts domain");
-		return err;
-	}
+	Error domain_load_err = _load_scripts_domain();
+	ERR_FAIL_COND_V_MSG(domain_load_err != OK, domain_load_err, "Mono: Failed to load scripts domain.");
 
 	// Load assemblies. The API and tools assemblies are required,
 	// the application is aborted if these assemblies cannot be loaded.
@@ -909,10 +939,8 @@ Error GDMono::reload_scripts_domain() {
 	_load_api_assemblies();
 
 #if defined(TOOLS_ENABLED)
-	if (!_load_tools_assemblies()) {
-		ERR_EXPLAIN("Mono: Failed to load GodotTools assemblies");
-		CRASH_NOW();
-	}
+	bool tools_assemblies_loaded = _load_tools_assemblies();
+	CRASH_COND_MSG(!tools_assemblies_loaded, "Mono: Failed to load '" TOOLS_ASM_NAME "' assemblies.");
 #endif
 
 	// Load the project's main assembly. Here, during hot-reloading, we do
@@ -934,13 +962,13 @@ Error GDMono::finalize_and_unload_domain(MonoDomain *p_domain) {
 
 	String domain_name = mono_domain_get_friendly_name(p_domain);
 
-	print_verbose("Mono: Unloading domain `" + domain_name + "`...");
+	print_verbose("Mono: Unloading domain '" + domain_name + "'...");
 
 	if (mono_domain_get() == p_domain)
 		mono_domain_set(root_domain, true);
 
 	if (!mono_domain_finalize(p_domain, 2000)) {
-		ERR_PRINT("Mono: Domain finalization timeout");
+		ERR_PRINT("Mono: Domain finalization timeout.");
 	}
 
 	mono_gc_collect(mono_gc_max_generation());
@@ -951,7 +979,7 @@ Error GDMono::finalize_and_unload_domain(MonoDomain *p_domain) {
 	mono_domain_try_unload(p_domain, (MonoObject **)&exc);
 
 	if (exc) {
-		ERR_PRINTS("Exception thrown when unloading domain `" + domain_name + "`");
+		ERR_PRINTS("Exception thrown when unloading domain '" + domain_name + "'.");
 		GDMonoUtils::debug_print_unhandled_exception(exc);
 		return FAILED;
 	}
@@ -1058,6 +1086,8 @@ GDMono::GDMono() {
 #ifdef TOOLS_ENABLED
 	api_editor_hash = 0;
 #endif
+
+	unhandled_exception_policy = POLICY_TERMINATE_APP;
 }
 
 GDMono::~GDMono() {
@@ -1066,7 +1096,7 @@ GDMono::~GDMono() {
 		if (scripts_domain) {
 			Error err = _unload_scripts_domain();
 			if (err != OK) {
-				ERR_PRINT("Mono: Failed to unload scripts domain");
+				ERR_PRINT("Mono: Failed to unload scripts domain.");
 			}
 		}
 
diff --git a/modules/mono/mono_gd/gd_mono.h b/modules/mono/mono_gd/gd_mono.h
index deebe5fd50..4f7d3791f7 100644
--- a/modules/mono/mono_gd/gd_mono.h
+++ b/modules/mono/mono_gd/gd_mono.h
@@ -80,6 +80,13 @@ String to_string(Type p_type);
 
 class GDMono {
 
+public:
+	enum UnhandledExceptionPolicy {
+		POLICY_TERMINATE_APP,
+		POLICY_LOG_ERROR
+	};
+
+private:
 	bool runtime_initialized;
 	bool finalizing_scripts_domain;
 
@@ -102,6 +109,8 @@ class GDMono {
 
 	HashMap<uint32_t, HashMap<String, GDMonoAssembly *> > assemblies;
 
+	UnhandledExceptionPolicy unhandled_exception_policy;
+
 	void _domain_assemblies_cleanup(uint32_t p_domain_id);
 
 	bool _are_api_assemblies_out_of_sync();
@@ -156,13 +165,15 @@ public:
 #endif
 
 #ifdef TOOLS_ENABLED
-	bool copy_prebuilt_api_assembly(APIAssembly::Type p_api_type);
+	bool copy_prebuilt_api_assembly(APIAssembly::Type p_api_type, const String &p_config);
 	String update_api_assemblies_from_prebuilt();
 #endif
 
 	static GDMono *get_singleton() { return singleton; }
 
-	static void unhandled_exception_hook(MonoObject *p_exc, void *p_user_data);
+	GD_NORETURN static void unhandled_exception_hook(MonoObject *p_exc, void *p_user_data);
+
+	UnhandledExceptionPolicy get_unhandled_exception_policy() const { return unhandled_exception_policy; }
 
 	// Do not use these, unless you know what you're doing
 	void add_assembly(uint32_t p_domain_id, GDMonoAssembly *p_assembly);
diff --git a/modules/mono/mono_gd/gd_mono_assembly.cpp b/modules/mono/mono_gd/gd_mono_assembly.cpp
index 761c7f6fcb..a82bb42731 100644
--- a/modules/mono/mono_gd/gd_mono_assembly.cpp
+++ b/modules/mono/mono_gd/gd_mono_assembly.cpp
@@ -151,14 +151,14 @@ MonoAssembly *GDMonoAssembly::_preload_hook(MonoAssemblyName *aname, char **, vo
 	}
 
 	{
-		// If we find the assembly here, we load it with `mono_assembly_load_from_full`,
+		// If we find the assembly here, we load it with 'mono_assembly_load_from_full',
 		// which in turn invokes load hooks before returning the MonoAssembly to us.
-		// One of the load hooks is `load_aot_module`. This hook can end up calling preload hooks
-		// again for the same assembly in certain in certain circumstances (the `do_load_image` part).
+		// One of the load hooks is 'load_aot_module'. This hook can end up calling preload hooks
+		// again for the same assembly in certain in certain circumstances (the 'do_load_image' part).
 		// If this is the case and we return NULL due to the no_search condition below,
 		// it will result in an internal crash later on. Therefore we need to return the assembly we didn't
-		// get yet from `mono_assembly_load_from_full`. Luckily we have the image, which already got it.
-		// This must be done here. If done in search hooks, it would cause `mono_assembly_load_from_full`
+		// get yet from 'mono_assembly_load_from_full'. Luckily we have the image, which already got it.
+		// This must be done here. If done in search hooks, it would cause 'mono_assembly_load_from_full'
 		// to think another MonoAssembly for this assembly was already loaded, making it delete its own,
 		// when in fact both pointers were the same... This hooks thing is confusing.
 		if (image_corlib_loading) {
diff --git a/modules/mono/mono_gd/gd_mono_class.cpp b/modules/mono/mono_gd/gd_mono_class.cpp
index 1c10d3c8eb..89a88fcfb2 100644
--- a/modules/mono/mono_gd/gd_mono_class.cpp
+++ b/modules/mono/mono_gd/gd_mono_class.cpp
@@ -165,8 +165,8 @@ void GDMonoClass::fetch_methods_with_godot_api_checks(GDMonoClass *p_native_base
 
 #ifdef DEBUG_ENABLED
 			String fullname = method->get_ret_type_full_name() + " " + name + "(" + method->get_signature_desc(true) + ")";
-			WARN_PRINTS("Method `" + fullname + "` is hidden by Godot API method. Should be `" +
-						method->get_full_name_no_class() + "`. In class `" + namespace_name + "." + class_name + "`.");
+			WARN_PRINTS("Method '" + fullname + "' is hidden by Godot API method. Should be '" +
+						method->get_full_name_no_class() + "'. In class '" + namespace_name + "." + class_name + "'.");
 #endif
 			continue;
 		}
@@ -184,8 +184,8 @@ void GDMonoClass::fetch_methods_with_godot_api_checks(GDMonoClass *p_native_base
 				if (m && m->get_name() != name) {
 					// found
 					String fullname = m->get_ret_type_full_name() + " " + name + "(" + m->get_signature_desc(true) + ")";
-					WARN_PRINTS("Method `" + fullname + "` should be `" + m->get_full_name_no_class() +
-								"`. In class `" + namespace_name + "." + class_name + "`.");
+					WARN_PRINTS("Method '" + fullname + "' should be '" + m->get_full_name_no_class() +
+								"'. In class '" + namespace_name + "." + class_name + "'.");
 					break;
 				}
 
diff --git a/modules/mono/mono_gd/gd_mono_field.cpp b/modules/mono/mono_gd/gd_mono_field.cpp
index 3999658f93..7b8e6f89e9 100644
--- a/modules/mono/mono_gd/gd_mono_field.cpp
+++ b/modules/mono/mono_gd/gd_mono_field.cpp
@@ -219,16 +219,14 @@ void GDMonoField::set_value_from_variant(MonoObject *p_object, const Variant &p_
 						break;
 					}
 					default: {
-						ERR_EXPLAIN(String() + "Attempted to convert Variant to a managed enum value of unmarshallable base type.");
-						ERR_FAIL();
+						ERR_FAIL_MSG("Attempted to convert Variant to a managed enum value of unmarshallable base type.");
 					}
 				}
 
 				break;
 			}
 
-			ERR_EXPLAIN(String() + "Attempted to set the value of a field of unmarshallable type: " + tclass->get_name());
-			ERR_FAIL();
+			ERR_FAIL_MSG("Attempted to set the value of a field of unmarshallable type: '" + tclass->get_name() + "'.");
 		} break;
 
 		case MONO_TYPE_ARRAY:
@@ -275,8 +273,7 @@ void GDMonoField::set_value_from_variant(MonoObject *p_object, const Variant &p_
 				break;
 			}
 
-			ERR_EXPLAIN(String() + "Attempted to convert Variant to a managed array of unmarshallable element type.");
-			ERR_FAIL();
+			ERR_FAIL_MSG("Attempted to convert Variant to a managed array of unmarshallable element type.");
 		} break;
 
 		case MONO_TYPE_CLASS: {
@@ -351,8 +348,7 @@ void GDMonoField::set_value_from_variant(MonoObject *p_object, const Variant &p_
 				}
 			}
 
-			ERR_EXPLAIN(String() + "Attempted to set the value of a field of unmarshallable type: " + type_class->get_name());
-			ERR_FAIL();
+			ERR_FAIL_MSG("Attempted to set the value of a field of unmarshallable type: '" + type_class->get_name() + "'.");
 		} break;
 
 		case MONO_TYPE_OBJECT: {
@@ -508,7 +504,7 @@ void GDMonoField::set_value_from_variant(MonoObject *p_object, const Variant &p_
 		} break;
 
 		default: {
-			ERR_PRINTS(String() + "Attempted to set the value of a field of unexpected type encoding: " + itos(type.type_encoding));
+			ERR_PRINTS("Attempted to set the value of a field of unexpected type encoding: " + itos(type.type_encoding) + ".");
 		} break;
 	}
 
diff --git a/modules/mono/mono_gd/gd_mono_internals.cpp b/modules/mono/mono_gd/gd_mono_internals.cpp
index a84332d4cd..3324ecb3a8 100644
--- a/modules/mono/mono_gd/gd_mono_internals.cpp
+++ b/modules/mono/mono_gd/gd_mono_internals.cpp
@@ -48,7 +48,7 @@ void tie_managed_to_unmanaged(MonoObject *managed, Object *unmanaged) {
 
 	CRASH_COND(!unmanaged);
 
-	// All mono objects created from the managed world (e.g.: `new Player()`)
+	// All mono objects created from the managed world (e.g.: 'new Player()')
 	// need to have a CSharpScript in order for their methods to be callable from the unmanaged side
 
 	Reference *ref = Object::cast_to<Reference>(unmanaged);
@@ -108,9 +108,18 @@ void tie_managed_to_unmanaged(MonoObject *managed, Object *unmanaged) {
 
 void unhandled_exception(MonoException *p_exc) {
 	mono_unhandled_exception((MonoObject *)p_exc); // prints the exception as well
-	// Too bad 'mono_invoke_unhandled_exception_hook' is not exposed to embedders
-	GDMono::unhandled_exception_hook((MonoObject *)p_exc, NULL);
-	GD_UNREACHABLE();
+
+	if (GDMono::get_singleton()->get_unhandled_exception_policy() == GDMono::POLICY_TERMINATE_APP) {
+		// Too bad 'mono_invoke_unhandled_exception_hook' is not exposed to embedders
+		GDMono::unhandled_exception_hook((MonoObject *)p_exc, NULL);
+		GD_UNREACHABLE();
+	} else {
+#ifdef DEBUG_ENABLED
+		GDMonoUtils::debug_send_unhandled_exception_error((MonoException *)p_exc);
+		if (ScriptDebugger::get_singleton())
+			ScriptDebugger::get_singleton()->idle_poll();
+#endif
+	}
 }
 
 } // namespace GDMonoInternals
diff --git a/modules/mono/mono_gd/gd_mono_internals.h b/modules/mono/mono_gd/gd_mono_internals.h
index 2d77bde27c..0d82723913 100644
--- a/modules/mono/mono_gd/gd_mono_internals.h
+++ b/modules/mono/mono_gd/gd_mono_internals.h
@@ -45,7 +45,7 @@ void tie_managed_to_unmanaged(MonoObject *managed, Object *unmanaged);
  * Do not call this function directly.
  * Use GDMonoUtils::debug_unhandled_exception(MonoException *) instead.
  */
-GD_NORETURN void unhandled_exception(MonoException *p_exc);
+void unhandled_exception(MonoException *p_exc);
 
 } // namespace GDMonoInternals
 
diff --git a/modules/mono/mono_gd/gd_mono_log.cpp b/modules/mono/mono_gd/gd_mono_log.cpp
index a6e04e561d..6d91075ce3 100644
--- a/modules/mono/mono_gd/gd_mono_log.cpp
+++ b/modules/mono/mono_gd/gd_mono_log.cpp
@@ -72,7 +72,7 @@ static void mono_log_callback(const char *log_domain, const char *log_level, con
 	}
 
 	if (fatal) {
-		ERR_PRINTS("Mono: FATAL ERROR, ABORTING! Logfile: " + GDMonoLog::get_singleton()->get_log_file_path() + "\n");
+		ERR_PRINTS("Mono: FATAL ERROR, ABORTING! Logfile: '" + GDMonoLog::get_singleton()->get_log_file_path() + "'.");
 		// Make sure to flush before aborting
 		f->flush();
 		f->close();
@@ -90,8 +90,7 @@ bool GDMonoLog::_try_create_logs_dir(const String &p_logs_dir) {
 		DirAccessRef diraccess = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
 		ERR_FAIL_COND_V(!diraccess, false);
 		Error logs_mkdir_err = diraccess->make_dir_recursive(p_logs_dir);
-		ERR_EXPLAIN("Failed to create mono logs directory");
-		ERR_FAIL_COND_V(logs_mkdir_err != OK, false);
+		ERR_FAIL_COND_V_MSG(logs_mkdir_err != OK, false, "Failed to create mono logs directory.");
 	}
 
 	return true;
@@ -131,7 +130,7 @@ void GDMonoLog::initialize() {
 	CharString log_level = OS::get_singleton()->get_environment("GODOT_MONO_LOG_LEVEL").utf8();
 
 	if (log_level.length() != 0 && log_level_get_id(log_level.get_data()) == -1) {
-		ERR_PRINTS(String() + "Mono: Ignoring invalid log level (GODOT_MONO_LOG_LEVEL): " + log_level.get_data());
+		ERR_PRINTS(String() + "Mono: Ignoring invalid log level (GODOT_MONO_LOG_LEVEL): '" + log_level.get_data() + "'.");
 		log_level = CharString();
 	}
 
@@ -160,7 +159,7 @@ void GDMonoLog::initialize() {
 
 		log_file = FileAccess::open(log_file_path, FileAccess::WRITE);
 		if (!log_file) {
-			ERR_PRINT("Mono: Cannot create log file");
+			ERR_PRINTS("Mono: Cannot create log file at: " + log_file_path);
 		}
 	}
 
diff --git a/modules/mono/mono_gd/gd_mono_marshal.cpp b/modules/mono/mono_gd/gd_mono_marshal.cpp
index 42102ed835..7aac691102 100644
--- a/modules/mono/mono_gd/gd_mono_marshal.cpp
+++ b/modules/mono/mono_gd/gd_mono_marshal.cpp
@@ -276,7 +276,7 @@ String mono_to_utf8_string(MonoString *p_mono_string) {
 	char *utf8 = mono_string_to_utf8_checked(p_mono_string, &error);
 
 	if (!mono_error_ok(&error)) {
-		ERR_PRINTS(String("Failed to convert MonoString* to UTF-8: ") + mono_error_get_message(&error));
+		ERR_PRINTS(String() + "Failed to convert MonoString* to UTF-8: '" + mono_error_get_message(&error) + "'.");
 		mono_error_cleanup(&error);
 		return String();
 	}
@@ -474,8 +474,7 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 						return BOX_ENUM(enum_baseclass, val);
 					}
 					default: {
-						ERR_EXPLAIN(String() + "Attempted to convert Variant to a managed enum value of unmarshallable base type.");
-						ERR_FAIL_V(NULL);
+						ERR_FAIL_V_MSG(NULL, "Attempted to convert Variant to a managed enum value of unmarshallable base type.");
 					}
 				}
 			}
@@ -509,8 +508,7 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 			if (array_type->eklass == CACHED_CLASS_RAW(Color))
 				return (MonoObject *)PoolColorArray_to_mono_array(p_var->operator PoolColorArray());
 
-			ERR_EXPLAIN(String() + "Attempted to convert Variant to a managed array of unmarshallable element type.");
-			ERR_FAIL_V(NULL);
+			ERR_FAIL_V_MSG(NULL, "Attempted to convert Variant to a managed array of unmarshallable element type.");
 		} break;
 
 		case MONO_TYPE_CLASS: {
@@ -695,9 +693,8 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 		} break;
 	}
 
-	ERR_EXPLAIN(String() + "Attempted to convert Variant to an unmarshallable managed type. Name: \'" +
-				p_type.type_class->get_name() + "\' Encoding: " + itos(p_type.type_encoding));
-	ERR_FAIL_V(NULL);
+	ERR_FAIL_V_MSG(NULL, "Attempted to convert Variant to an unmarshallable managed type. Name: '" +
+								 p_type.type_class->get_name() + "' Encoding: " + itos(p_type.type_encoding) + ".");
 }
 
 Variant mono_object_to_variant(MonoObject *p_obj) {
@@ -809,8 +806,7 @@ Variant mono_object_to_variant(MonoObject *p_obj) {
 			if (array_type->eklass == CACHED_CLASS_RAW(Color))
 				return mono_array_to_PoolColorArray((MonoArray *)p_obj);
 
-			ERR_EXPLAIN(String() + "Attempted to convert a managed array of unmarshallable element type to Variant.");
-			ERR_FAIL_V(Variant());
+			ERR_FAIL_V_MSG(Variant(), "Attempted to convert a managed array of unmarshallable element type to Variant.");
 		} break;
 
 		case MONO_TYPE_CLASS: {
@@ -908,9 +904,8 @@ Variant mono_object_to_variant(MonoObject *p_obj) {
 		} break;
 	}
 
-	ERR_EXPLAIN(String() + "Attempted to convert an unmarshallable managed type to Variant. Name: \'" +
-				type.type_class->get_name() + "\' Encoding: " + itos(type.type_encoding));
-	ERR_FAIL_V(Variant());
+	ERR_FAIL_V_MSG(Variant(), "Attempted to convert an unmarshallable managed type to Variant. Name: '" +
+									  type.type_class->get_name() + "' Encoding: " + itos(type.type_encoding) + ".");
 }
 
 MonoArray *Array_to_mono_array(const Array &p_array) {
diff --git a/modules/mono/mono_gd/gd_mono_utils.cpp b/modules/mono/mono_gd/gd_mono_utils.cpp
index 5987fa8ebb..e385f4c601 100644
--- a/modules/mono/mono_gd/gd_mono_utils.cpp
+++ b/modules/mono/mono_gd/gd_mono_utils.cpp
@@ -37,6 +37,10 @@
 #include "core/project_settings.h"
 #include "core/reference.h"
 
+#ifdef TOOLS_ENABLED
+#include "editor/script_editor_debugger.h"
+#endif
+
 #include "../csharp_script.h"
 #include "../utils/macros.h"
 #include "../utils/mutex_utils.h"
@@ -48,14 +52,11 @@ namespace GDMonoUtils {
 
 MonoCache mono_cache;
 
-#define CACHE_AND_CHECK(m_var, m_val)                             \
-	{                                                             \
-		CRASH_COND(m_var != NULL);                                \
-		m_var = m_val;                                            \
-		if (!m_var) {                                             \
-			ERR_EXPLAIN("Mono Cache: Member " #m_var " is null"); \
-			ERR_FAIL();                                           \
-		}                                                         \
+#define CACHE_AND_CHECK(m_var, m_val)                                        \
+	{                                                                        \
+		CRASH_COND(m_var != NULL);                                           \
+		m_var = m_val;                                                       \
+		ERR_FAIL_COND_MSG(!m_var, "Mono Cache: Member " #m_var " is null."); \
 	}
 
 #define CACHE_CLASS_AND_CHECK(m_class, m_val) CACHE_AND_CHECK(GDMonoUtils::mono_cache.class_##m_class, m_val)
@@ -449,10 +450,9 @@ GDMonoClass *get_class_native_base(GDMonoClass *p_class) {
 }
 
 MonoObject *create_managed_for_godot_object(GDMonoClass *p_class, const StringName &p_native, Object *p_object) {
-	if (!ClassDB::is_parent_class(p_object->get_class_name(), p_native)) {
-		ERR_EXPLAIN("Type inherits from native type '" + p_native + "', so it can't be instanced in object of type: '" + p_object->get_class() + "'");
-		ERR_FAIL_V(NULL);
-	}
+	bool parent_is_object_class = ClassDB::is_parent_class(p_object->get_class_name(), p_native);
+	ERR_FAIL_COND_V_MSG(!parent_is_object_class, NULL,
+			"Type inherits from native type '" + p_native + "', so it can't be instanced in object of type: '" + p_object->get_class() + "'.");
 
 	MonoObject *mono_object = mono_object_new(mono_domain_get(), p_class->get_mono_ptr());
 	ERR_FAIL_NULL_V(mono_object, NULL);
@@ -596,8 +596,14 @@ void debug_print_unhandled_exception(MonoException *p_exc) {
 
 void debug_send_unhandled_exception_error(MonoException *p_exc) {
 #ifdef DEBUG_ENABLED
-	if (!ScriptDebugger::get_singleton())
+	if (!ScriptDebugger::get_singleton()) {
+#ifdef TOOLS_ENABLED
+		if (Engine::get_singleton()->is_editor_hint()) {
+			ERR_PRINTS(GDMonoUtils::get_exception_name_and_message(p_exc));
+		}
+#endif
 		return;
+	}
 
 	_TLS_RECURSION_GUARD_;
 
@@ -621,7 +627,7 @@ void debug_send_unhandled_exception_error(MonoException *p_exc) {
 
 		if (unexpected_exc) {
 			GDMonoInternals::unhandled_exception(unexpected_exc);
-			GD_UNREACHABLE();
+			return;
 		}
 
 		Vector<ScriptLanguage::StackInfo> _si;
@@ -655,7 +661,6 @@ void debug_send_unhandled_exception_error(MonoException *p_exc) {
 
 void debug_unhandled_exception(MonoException *p_exc) {
 	GDMonoInternals::unhandled_exception(p_exc); // prints the exception as well
-	GD_UNREACHABLE();
 }
 
 void print_unhandled_exception(MonoException *p_exc) {
@@ -665,11 +670,9 @@ void print_unhandled_exception(MonoException *p_exc) {
 void set_pending_exception(MonoException *p_exc) {
 #ifdef NO_PENDING_EXCEPTIONS
 	debug_unhandled_exception(p_exc);
-	GD_UNREACHABLE();
 #else
 	if (get_runtime_invoke_count() == 0) {
 		debug_unhandled_exception(p_exc);
-		GD_UNREACHABLE();
 	}
 
 	if (!mono_runtime_set_pending_exception(p_exc, false)) {
diff --git a/modules/mono/mono_gd/gd_mono_utils.h b/modules/mono/mono_gd/gd_mono_utils.h
index f535fbb6d0..d73743bf0b 100644
--- a/modules/mono/mono_gd/gd_mono_utils.h
+++ b/modules/mono/mono_gd/gd_mono_utils.h
@@ -289,7 +289,7 @@ void set_exception_message(MonoException *p_exc, String message);
 
 void debug_print_unhandled_exception(MonoException *p_exc);
 void debug_send_unhandled_exception_error(MonoException *p_exc);
-GD_NORETURN void debug_unhandled_exception(MonoException *p_exc);
+void debug_unhandled_exception(MonoException *p_exc);
 void print_unhandled_exception(MonoException *p_exc);
 
 /**
diff --git a/modules/mono/signal_awaiter_utils.cpp b/modules/mono/signal_awaiter_utils.cpp
index 54d73c971f..189ceaab1b 100644
--- a/modules/mono/signal_awaiter_utils.cpp
+++ b/modules/mono/signal_awaiter_utils.cpp
@@ -67,10 +67,8 @@ Error connect_signal_awaiter(Object *p_source, const String &p_signal, Object *p
 Variant SignalAwaiterHandle::_signal_callback(const Variant **p_args, int p_argcount, Variant::CallError &r_error) {
 
 #ifdef DEBUG_ENABLED
-	if (conn_target_id && !ObjectDB::get_instance(conn_target_id)) {
-		ERR_EXPLAIN("Resumed after await, but class instance is gone");
-		ERR_FAIL_V(Variant());
-	}
+	ERR_FAIL_COND_V_MSG(conn_target_id && !ObjectDB::get_instance(conn_target_id), Variant(),
+			"Resumed after await, but class instance is gone.");
 #endif
 
 	if (p_argcount < 1) {
diff --git a/modules/mono/utils/string_utils.cpp b/modules/mono/utils/string_utils.cpp
index 2b014c2a45..716c712ccc 100644
--- a/modules/mono/utils/string_utils.cpp
+++ b/modules/mono/utils/string_utils.cpp
@@ -55,10 +55,7 @@ int sfind(const String &p_text, int p_from) {
 		for (int j = 0; j < src_len; j++) {
 			int read_pos = i + j;
 
-			if (read_pos >= len) {
-				ERR_PRINT("read_pos >= len");
-				return -1;
-			};
+			ERR_FAIL_COND_V(read_pos >= len, -1);
 
 			switch (j) {
 				case 0:
@@ -211,14 +208,18 @@ String str_format(const char *p_format, ...) {
 #endif
 
 #if defined(MINGW_ENABLED) || defined(_MSC_VER) && _MSC_VER < 1900
-#define vsnprintf(m_buffer, m_count, m_format, m_argptr) vsnprintf_s(m_buffer, m_count, _TRUNCATE, m_format, m_argptr)
+#define gd_vsnprintf(m_buffer, m_count, m_format, m_args_copy) vsnprintf_s(m_buffer, m_count, _TRUNCATE, m_format, m_args_copy)
+#define gd_vscprintf(m_format, m_args_copy) _vscprintf(m_format, m_args_copy)
+#else
+#define gd_vsnprintf(m_buffer, m_count, m_format, m_args_copy) vsnprintf(m_buffer, m_count, m_format, m_args_copy)
+#define gd_vscprintf(m_format, m_args_copy) vsnprintf(NULL, 0, p_format, m_args_copy)
 #endif
 
 String str_format(const char *p_format, va_list p_list) {
 	va_list list;
 
 	va_copy(list, p_list);
-	int len = vsnprintf(NULL, 0, p_format, list);
+	int len = gd_vscprintf(p_format, list);
 	va_end(list);
 
 	len += 1; // for the trailing '/0'
@@ -226,7 +227,7 @@ String str_format(const char *p_format, va_list p_list) {
 	char *buffer(memnew_arr(char, len));
 
 	va_copy(list, p_list);
-	vsnprintf(buffer, len, p_format, list);
+	gd_vsnprintf(buffer, len, p_format, list);
 	va_end(list);
 
 	String res(buffer);