Gmail MCP

Instructions

Implementation Reference

• src/index.ts:942-953 (registration)

  Registration of the 'remove_delegate' tool, including inline schema, handler that invokes Gmail API to delete delegate via users.settings.delegates.delete
  server.tool("remove_delegate", "Removes the specified delegate", { delegateEmail: z.string().describe("Email address of delegate to remove") }, async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.delegates.delete({ userId: 'me', delegateEmail: params.delegateEmail }) return formatResponse(data) }) } )
• src/index.ts:947-952 (handler)

  The handler function for remove_delegate tool, which uses handleTool to authenticate and call the Gmail delegates.delete API endpoint.
  async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.delegates.delete({ userId: 'me', delegateEmail: params.delegateEmail }) return formatResponse(data) }) }
• src/index.ts:944-946 (schema)

  Zod input schema for the remove_delegate tool requiring a delegateEmail string.
  { delegateEmail: z.string().describe("Email address of delegate to remove") },
• src/index.ts:49-65 (helper)

  Shared helper function handleTool used by remove_delegate (and other tools) to handle OAuth2 authentication and Gmail client creation before executing the API call.
  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:47-48 (helper)

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