Godot MCP

Instructions

Implementation Reference

• src/index.ts:1054-1153 (handler)

  Implements the core logic for running a Godot project: validates input, spawns Godot process in debug mode with optional scene, captures stdout/stderr, stores in activeProcess for later retrieval.
  private async handleRunProject(args: any) { // Normalize parameters to camelCase args = this.normalizeParameters(args); if (!args.projectPath) { return this.createErrorResponse( 'Project path is required', ['Provide a valid path to a Godot project directory'] ); } if (!this.validatePath(args.projectPath)) { return this.createErrorResponse( 'Invalid project path', ['Provide a valid path without ".." or other potentially unsafe characters'] ); } try { // Check if the project directory exists and contains a project.godot file const projectFile = join(args.projectPath, 'project.godot'); if (!existsSync(projectFile)) { return this.createErrorResponse( `Not a valid Godot project: ${args.projectPath}`, [ 'Ensure the path points to a directory containing a project.godot file', 'Use list_projects to find valid Godot projects', ] ); } // Kill any existing process if (this.activeProcess) { this.logDebug('Killing existing Godot process before starting a new one'); this.activeProcess.process.kill(); } const cmdArgs = ['-d', '--path', args.projectPath]; if (args.scene && this.validatePath(args.scene)) { this.logDebug(`Adding scene parameter: ${args.scene}`); cmdArgs.push(args.scene); } this.logDebug(`Running Godot project: ${args.projectPath}`); const process = spawn(this.godotPath!, cmdArgs, { stdio: 'pipe' }); const output: string[] = []; const errors: string[] = []; process.stdout?.on('data', (data: Buffer) => { const lines = data.toString().split('\n'); output.push(...lines); lines.forEach((line: string) => { if (line.trim()) this.logDebug(`[Godot stdout] ${line}`); }); }); process.stderr?.on('data', (data: Buffer) => { const lines = data.toString().split('\n'); errors.push(...lines); lines.forEach((line: string) => { if (line.trim()) this.logDebug(`[Godot stderr] ${line}`); }); }); process.on('exit', (code: number | null) => { this.logDebug(`Godot process exited with code ${code}`); if (this.activeProcess && this.activeProcess.process === process) { this.activeProcess = null; } }); process.on('error', (err: Error) => { console.error('Failed to start Godot process:', err); if (this.activeProcess && this.activeProcess.process === process) { this.activeProcess = null; } }); this.activeProcess = { process, output, errors }; return { content: [ { type: 'text', text: `Godot project started in debug mode. Use get_debug_output to see output.`, }, ], }; } catch (error: unknown) { const errorMessage = error instanceof Error ? error.message : 'Unknown error'; return this.createErrorResponse( `Failed to run Godot project: ${errorMessage}`, [ 'Ensure Godot is installed correctly', 'Check if the GODOT_PATH environment variable is set correctly', 'Verify the project path is accessible', ] ); } }
• src/index.ts:684-699 (schema)

  Defines the input schema for the run_project tool, including required projectPath and optional scene.
  name: 'run_project', description: 'Run the Godot project and capture output', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, scene: { type: 'string', description: 'Optional: Specific scene to run', }, }, required: ['projectPath'], },
• src/index.ts:937-937 (registration)

  Registers the handler dispatch for the 'run_project' tool in the CallToolRequestSchema switch statement.
  return await this.handleRunProject(request.params.arguments);
• src/index.ts:667-928 (registration)

  Registers the run_project tool in the list of available tools returned by ListToolsRequestSchema.
  this.server.setRequestHandler(ListToolsRequestSchema, async () => ({ tools: [ { name: 'launch_editor', description: 'Launch Godot editor for a specific project', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, }, required: ['projectPath'], }, }, { name: 'run_project', description: 'Run the Godot project and capture output', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, scene: { type: 'string', description: 'Optional: Specific scene to run', }, }, required: ['projectPath'], }, }, { name: 'get_debug_output', description: 'Get the current debug output and errors', inputSchema: { type: 'object', properties: {}, required: [], }, }, { name: 'stop_project', description: 'Stop the currently running Godot project', inputSchema: { type: 'object', properties: {}, required: [], }, }, { name: 'get_godot_version', description: 'Get the installed Godot version', inputSchema: { type: 'object', properties: {}, required: [], }, }, { name: 'list_projects', description: 'List Godot projects in a directory', inputSchema: { type: 'object', properties: { directory: { type: 'string', description: 'Directory to search for Godot projects', }, recursive: { type: 'boolean', description: 'Whether to search recursively (default: false)', }, }, required: ['directory'], }, }, { name: 'get_project_info', description: 'Retrieve metadata about a Godot project', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, }, required: ['projectPath'], }, }, { name: 'create_scene', description: 'Create a new Godot scene file', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, scenePath: { type: 'string', description: 'Path where the scene file will be saved (relative to project)', }, rootNodeType: { type: 'string', description: 'Type of the root node (e.g., Node2D, Node3D)', default: 'Node2D', }, }, required: ['projectPath', 'scenePath'], }, }, { name: 'add_node', description: 'Add a node to an existing scene', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, scenePath: { type: 'string', description: 'Path to the scene file (relative to project)', }, parentNodePath: { type: 'string', description: 'Path to the parent node (e.g., "root" or "root/Player")', default: 'root', }, nodeType: { type: 'string', description: 'Type of node to add (e.g., Sprite2D, CollisionShape2D)', }, nodeName: { type: 'string', description: 'Name for the new node', }, properties: { type: 'object', description: 'Optional properties to set on the node', }, }, required: ['projectPath', 'scenePath', 'nodeType', 'nodeName'], }, }, { name: 'load_sprite', description: 'Load a sprite into a Sprite2D node', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, scenePath: { type: 'string', description: 'Path to the scene file (relative to project)', }, nodePath: { type: 'string', description: 'Path to the Sprite2D node (e.g., "root/Player/Sprite2D")', }, texturePath: { type: 'string', description: 'Path to the texture file (relative to project)', }, }, required: ['projectPath', 'scenePath', 'nodePath', 'texturePath'], }, }, { name: 'export_mesh_library', description: 'Export a scene as a MeshLibrary resource', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, scenePath: { type: 'string', description: 'Path to the scene file (.tscn) to export', }, outputPath: { type: 'string', description: 'Path where the mesh library (.res) will be saved', }, meshItemNames: { type: 'array', items: { type: 'string', }, description: 'Optional: Names of specific mesh items to include (defaults to all)', }, }, required: ['projectPath', 'scenePath', 'outputPath'], }, }, { name: 'save_scene', description: 'Save changes to a scene file', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, scenePath: { type: 'string', description: 'Path to the scene file (relative to project)', }, newPath: { type: 'string', description: 'Optional: New path to save the scene to (for creating variants)', }, }, required: ['projectPath', 'scenePath'], }, }, { name: 'get_uid', description: 'Get the UID for a specific file in a Godot project (for Godot 4.4+)', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, filePath: { type: 'string', description: 'Path to the file (relative to project) for which to get the UID', }, }, required: ['projectPath', 'filePath'], }, }, { name: 'update_project_uids', description: 'Update UID references in a Godot project by resaving resources (for Godot 4.4+)', inputSchema: { type: 'object', properties: { projectPath: { type: 'string', description: 'Path to the Godot project directory', }, }, required: ['projectPath'], }, }, ], }));