Gmail MCP Server

Instructions

Implementation Reference

• src/index.ts:702-712 (registration)

  Registration of the 'delete_thread' tool, including input schema (id: string) and handler function that uses handleTool to call Gmail API's users.threads.delete with the provided thread ID and formats the response.
  server.tool("delete_thread", "Delete a thread", { id: z.string().describe("The ID of the thread to delete") }, async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.threads.delete({ userId: 'me', id: params.id }) return formatResponse(data) }) }
• src/index.ts:707-712 (handler)

  Handler function for 'delete_thread' tool: authenticates via handleTool, deletes the specified thread using Gmail API, and returns formatted response.
  async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.threads.delete({ userId: 'me', id: params.id }) return formatResponse(data) }) }
• src/index.ts:704-706 (schema)

  Input schema for 'delete_thread' tool: requires 'id' as string (thread ID).
  { id: z.string().describe("The ID of the thread to delete") },
• src/index.ts:50-66 (helper)

  Shared helper function 'handleTool' used by 'delete_thread' (and other tools) for OAuth2 authentication, Gmail client creation, and executing the API call with error handling.
  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)

  Shared helper 'formatResponse' used by 'delete_thread' to format API responses into MCP content format.
  const formatResponse = (response: any) => ({ content: [{ type: "text", text: JSON.stringify(response) }] })