Gmail MCP Server

Instructions

Implementation Reference

• src/index.ts:804-815 (registration)

  Registration of the 'untrash_thread' tool. Includes input schema (thread ID) and inline handler that uses the Gmail API to untrash the specified thread via gmail.users.threads.untrash. Relies on shared 'handleTool' and 'formatResponse' utilities.

  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:809-813 (handler)

  The handler function for 'untrash_thread' tool. It invokes the shared 'handleTool' which handles OAuth, validates credentials, creates Gmail client, calls the Gmail API's threads.untrash method with the provided thread ID, and formats 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:806-808 (schema)

  Input schema for 'untrash_thread' tool using Zod: requires a single 'id' parameter which is the thread ID.

  {
    id: z.string().describe("The ID of the thread to remove from trash")
  },

• src/index.ts:50-66 (helper)

  Shared 'handleTool' helper used by 'untrash_thread' and other tools. Manages OAuth2 client creation, credential validation, Gmail client instantiation, executes the provided API call, and handles errors.

  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}`
    }
  }