Gmail MCP Server

Instructions

Implementation Reference

• src/index.ts:1063-1074 (registration)

  Registration of the 'create_forwarding_address' MCP tool. Includes input schema (forwardingEmail), description, and handler that calls Gmail API's users.settings.forwardingAddresses.create via the shared handleTool helper.
  server.tool("create_forwarding_address", "Creates a forwarding address", { forwardingEmail: z.string().describe("An email address to which messages can be forwarded") }, async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.forwardingAddresses.create({ userId: 'me', requestBody: params }) return formatResponse(data) }) } )
• src/index.ts:1068-1073 (handler)

  Handler function for 'create_forwarding_address' tool. Uses shared handleTool to authenticate and execute the Gmail API call to create a new forwarding address.
  async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.forwardingAddresses.create({ userId: 'me', requestBody: params }) return formatResponse(data) }) }
• src/index.ts:1065-1067 (schema)

  Input schema for 'create_forwarding_address' tool using Zod: requires 'forwardingEmail' string.
  { forwardingEmail: z.string().describe("An email address to which messages can be forwarded") },
• src/index.ts:50-66 (helper)

  Shared helper function 'handleTool' used by all Gmail API tools, including 'create_forwarding_address', for OAuth2 authentication and API execution.
  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:48-49 (helper)

  Shared helper 'formatResponse' used to standardize tool responses as MCP content blocks.
  const formatResponse = (response: any) => ({ content: [{ type: "text", text: JSON.stringify(response) }] })