Google Apps Script MCP Server

Instructions

Implementation Reference

• tools/google-app-script-api/apps-script-api/script-projects-create.js:12-100 (handler)

  The core handler function `executeFunction` that implements the tool logic: validates inputs, authenticates with OAuth, makes POST request to Google Apps Script API to create project, handles responses and errors with detailed logging.

  const executeFunction = async ({ parentId, title }) => {
    const baseUrl = 'https://script.googleapis.com';
  
    try {
      console.log('🔨 Creating new Google Apps Script project:', title);
      
      // Validate required parameters
      if (!title) {
        throw new Error('title is required');
      }
  
      const projectData = {
        title
      };
  
      // Add parentId if provided
      if (parentId) {
        projectData.parentId = parentId;
      }
  
      // Construct the URL for the API request
      const url = new URL(`${baseUrl}/v1/projects`);
      console.log('🌐 API URL:', url.toString());
  
      // Get OAuth headers
      const headers = await getAuthHeaders();
      headers['Content-Type'] = 'application/json';
      console.log('🔐 Authorization headers obtained successfully');
  
      // Perform the fetch request
      const response = await fetch(url.toString(), {
        method: 'POST',
        headers,
        body: JSON.stringify(projectData)
      });
  
      console.log('📡 API Response Status:', response.status, response.statusText);
  
      // Check if the response was successful
      if (!response.ok) {
        const errorText = await response.text();
        let errorData;
        
        try {
          errorData = JSON.parse(errorText);
        } catch (parseError) {
          errorData = { message: errorText };
        }
  
        const detailedError = {
          status: response.status,
          statusText: response.statusText,
          url: url.toString(),
          error: errorData,
          timestamp: new Date().toISOString()
        };
  
        console.error('❌ API Error Details:', JSON.stringify(detailedError, null, 2));
        
        throw new Error(`API Error (${response.status}): ${errorData.error?.message || errorData.message || 'Unknown error'}`);
      }
  
      // Parse and return the response data
      const data = await response.json();
      console.log('✅ Successfully created script project');
      return data;
      
    } catch (error) {
      console.error('❌ Error creating script project:', {
        message: error.message,
        stack: error.stack,
        title,
        parentId,
        timestamp: new Date().toISOString()
      });
      
      // Return detailed error information for debugging
      return { 
        error: true,
        message: error.message,
        details: {
          title,
          parentId,
          timestamp: new Date().toISOString(),
          errorType: error.name || 'Unknown'
        }
      };
    }
  };

• tools/google-app-script-api/apps-script-api/script-projects-create.js:106-129 (schema)

  The tool schema definition including name 'script_projects_create', description, input parameters schema with properties parentId and title, and required fields.

  const apiTool = {
    function: executeFunction,
    definition: {
      type: 'function',
      function: {
        name: 'script_projects_create',
        description: 'Create a new Google Apps Script project.',
        parameters: {
          type: 'object',
          properties: {
            parentId: {
              type: 'string',
              description: 'The ID of the parent project.'
            },
            title: {
              type: 'string',
              description: 'The title of the new script project.'
            }
          },
          required: ['parentId', 'title']
        }
      }
    }
  };

• tools/paths.js:3-3 (registration)

  The tool file path is registered in the toolPaths array, which is used for dynamic discovery and loading of tools.

  'google-app-script-api/apps-script-api/script-projects-create.js',

• lib/tools.js:8-64 (registration)

  The `discoverTools` function dynamically loads all tools by importing modules from paths in toolPaths, extracting apiTool, wrapping with logging, and returning the list of tools for registration.

  export async function discoverTools() {
    logger.info('DISCOVERY', `Starting tool discovery for ${toolPaths.length} tool paths`);
    
    const toolPromises = toolPaths.map(async (file) => {
      try {
        logger.debug('DISCOVERY', `Loading tool from: ${file}`);
        const module = await import(`../tools/${file}`);
        
        if (!module.apiTool) {
          logger.warn('DISCOVERY', `Tool file missing apiTool export: ${file}`);
          return null;
        }
  
        const toolName = module.apiTool.definition?.function?.name;
        if (!toolName) {
          logger.warn('DISCOVERY', `Tool missing function name: ${file}`);
          return null;
        }
  
        // Wrap the original function with logging
        const originalFunction = module.apiTool.function;
        const wrappedFunction = withLogging(toolName, originalFunction);
  
        logger.debug('DISCOVERY', `Successfully loaded tool: ${toolName}`, {
          file,
          toolName,
          description: module.apiTool.definition?.function?.description
        });
  
        return {
          ...module.apiTool,
          function: wrappedFunction,
          path: file,
        };
      } catch (error) {
        logger.error('DISCOVERY', `Failed to load tool: ${file}`, {
          file,
          error: {
            message: error.message,
            stack: error.stack
          }
        });
        return null;
      }
    });
    
    const tools = (await Promise.all(toolPromises)).filter(Boolean);
    
    logger.info('DISCOVERY', `Tool discovery completed`, {
      totalPaths: toolPaths.length,
      successfullyLoaded: tools.length,
      failed: toolPaths.length - tools.length,
      toolNames: tools.map(t => t.definition?.function?.name).filter(Boolean)
    });
    
    return tools;
  }