Gmail MCP

Instructions

Implementation Reference

• src/index.ts:1112-1123 (registration)

  Registration of the 'delete_send_as' MCP tool, including description, input schema, and handler function that deletes a send-as alias via Gmail API.

  server.tool("delete_send_as",
    "Deletes the specified send-as alias",
    {
      sendAsEmail: z.string().describe("The send-as alias to be deleted")
    },
    async (params) => {
      return handleTool(config, async (gmail: gmail_v1.Gmail) => {
        const { data } = await gmail.users.settings.sendAs.delete({ userId: 'me', sendAsEmail: params.sendAsEmail })
        return formatResponse(data)
      })
    }
  )

• src/index.ts:1117-1122 (handler)

  Handler function executing the 'delete_send_as' tool logic: authenticates via handleTool, calls Gmail API to delete the sendAsEmail alias, and formats response.

  async (params) => {
    return handleTool(config, async (gmail: gmail_v1.Gmail) => {
      const { data } = await gmail.users.settings.sendAs.delete({ userId: 'me', sendAsEmail: params.sendAsEmail })
      return formatResponse(data)
    })
  }

• src/index.ts:1114-1116 (schema)

  Zod input schema for 'delete_send_as' tool: requires 'sendAsEmail' as string.

  {
    sendAsEmail: z.string().describe("The send-as alias to be deleted")
  },

• src/index.ts:49-65 (helper)

  Shared 'handleTool' helper used by 'delete_send_as' (and other tools) for OAuth2 client creation, credential validation, Gmail client setup, API call execution, and 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:47-47 (helper)

  Shared 'formatResponse' helper used to format tool responses as MCP content blocks with JSON stringified data.

  const formatResponse = (response: any) => ({ content: [{ type: "text", text: JSON.stringify(response) }] })