Gmail MCP Server

Instructions

Implementation Reference

• src/index.ts:1315-1324 (registration)

  Registration of the stop_mail_watch MCP tool using server.tool, including inline schema and handler.
  server.tool("stop_mail_watch", "Stop receiving push notifications for the given user mailbox", {}, async () => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.stop({ userId: 'me' }) return formatResponse(data) }) } )
• src/index.ts:1318-1323 (handler)

  Handler function that invokes the shared handleTool utility to perform OAuth2 authentication and call the Gmail API's users.stop method to stop mailbox watching.
  async () => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.stop({ userId: 'me' }) return formatResponse(data) }) }
• src/index.ts:1317-1317 (schema)

  Empty input schema (no parameters required) defined using Zod for the stop_mail_watch tool.
  {},
• src/index.ts:50-66 (helper)

  Shared helper function handleTool that handles OAuth2 client creation, credential validation, Gmail client instantiation, API execution, and error handling for all Gmail tools.
  const handleTool = async (queryConfig: Record<string, any> | undefined, apiCall: (gmail: gmail_v1.Gmail) => Promise<any>) => { try { const oauth2Client = queryConfig ? createOAuth2Client(queryConfig) : defaultOAuth2Client if (!oauth2Client) throw new Error('OAuth2 client could not be created, please check your credentials') const credentialsAreValid = await validateCredentials(oauth2Client) if (!credentialsAreValid) throw new Error('OAuth2 credentials are invalid, please re-authenticate') const gmailClient = queryConfig ? google.gmail({ version: 'v1', auth: oauth2Client }) : defaultGmailClient if (!gmailClient) throw new Error('Gmail client could not be created, please check your credentials') const result = await apiCall(gmailClient) return result } catch (error: any) { return `Tool execution failed: ${error.message}` } }
• src/index.ts:48-48 (helper)

  Helper function to format tool responses as MCP content blocks with JSON stringified data.
  const formatResponse = (response: any) => ({ content: [{ type: "text", text: JSON.stringify(response) }] })