Gmail MCP

Instructions

Implementation Reference

• src/index.ts:785-796 (registration)

  Registration of the 'untrash_thread' tool, including inline schema validation (thread ID as string) and handler function that authenticates via handleTool and calls the Gmail API's users.threads.untrash method to restore the thread from trash.
  server.tool("untrash_thread", "Remove a thread from the trash", { id: z.string().describe("The ID of the thread to remove from trash") }, async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.threads.untrash({ userId: 'me', id: params.id }) return formatResponse(data) }) } )
• src/index.ts:790-795 (handler)

  Handler function for untrash_thread tool: takes params (id), uses shared handleTool to execute Gmail API call gmail.users.threads.untrash('me', id), formats and returns the response.
  async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.threads.untrash({ userId: 'me', id: params.id }) return formatResponse(data) }) }
• src/index.ts:787-789 (schema)

  Input schema for untrash_thread tool using Zod: requires 'id' as string (thread ID).
  { id: z.string().describe("The ID of the thread to remove from trash") },
• src/index.ts:49-65 (helper)

  Shared helper 'handleTool' used by untrash_thread (and other tools) for OAuth2 authentication, credential validation, Gmail client creation, and executing the API call passed as callback.
  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)

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