Gmail MCP

Instructions

Implementation Reference

• src/index.ts:1057-1068 (registration)

  Registration of the 'delete_forwarding_address' tool, including description, input schema, and inline handler function that calls the Gmail API to delete the specified forwarding address.
  server.tool("delete_forwarding_address", "Deletes the specified forwarding address", { forwardingEmail: z.string().describe("The forwarding address to be deleted") }, async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.forwardingAddresses.delete({ userId: 'me', forwardingEmail: params.forwardingEmail }) return formatResponse(data) }) } )
• src/index.ts:1062-1067 (handler)

  The handler function executes the tool logic by invoking handleTool, which authenticates and calls the Gmail API's users.settings.forwardingAddresses.delete method.
  async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.forwardingAddresses.delete({ userId: 'me', forwardingEmail: params.forwardingEmail }) return formatResponse(data) }) }
• src/index.ts:1059-1061 (schema)

  Zod schema for input validation, requiring a 'forwardingEmail' string parameter.
  { forwardingEmail: z.string().describe("The forwarding address to be deleted") },
• src/index.ts:49-65 (helper)

  Shared helper function 'handleTool' that handles OAuth2 authentication, client creation, and executes the provided Gmail API callback, used by the delete_forwarding_address handler.
  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:47-47 (helper)

  Helper function to format API responses into MCP-compatible content structure.
  const formatResponse = (response: any) => ({ content: [{ type: "text", text: JSON.stringify(response) }] })