watch_mailbox
Monitor Gmail mailbox for new messages or changes, sending real-time notifications to a specified Pub/Sub topic with optional label filtering.
Instructions
Watch for changes to the user's mailbox
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| topicName | Yes | The name of the Cloud Pub/Sub topic to publish notifications to | |
| labelIds | No | Label IDs to restrict notifications to | |
| labelFilterAction | No | Whether to include or exclude the specified labels |
Implementation Reference
- src/index.ts:1300-1313 (registration)Registers the 'watch_mailbox' MCP tool, including its input schema (topicName, labelIds, labelFilterAction), description, and handler function that calls Gmail API's users.watch to set up push notifications for mailbox changes.server.tool("watch_mailbox", "Watch for changes to the user's mailbox", { topicName: z.string().describe("The name of the Cloud Pub/Sub topic to publish notifications to"), labelIds: z.array(z.string()).optional().describe("Label IDs to restrict notifications to"), labelFilterAction: z.enum(['include', 'exclude']).optional().describe("Whether to include or exclude the specified labels") }, async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.watch({ userId: 'me', requestBody: params }) return formatResponse(data) }) } )
- src/index.ts:1307-1312 (handler)The handler function for 'watch_mailbox' tool. Validates OAuth, creates Gmail client, calls gmail.users.watch with provided params to watch the mailbox, and formats the response.async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.watch({ userId: 'me', requestBody: params }) return formatResponse(data) }) }
- src/index.ts:1302-1306 (schema)Input schema for 'watch_mailbox' tool using Zod: requires topicName, optional labelIds and labelFilterAction.{ topicName: z.string().describe("The name of the Cloud Pub/Sub topic to publish notifications to"), labelIds: z.array(z.string()).optional().describe("Label IDs to restrict notifications to"), labelFilterAction: z.enum(['include', 'exclude']).optional().describe("Whether to include or exclude the specified labels") },
- src/index.ts:50-66 (helper)Generic helper function used by all Gmail tools, including 'watch_mailbox', to handle OAuth validation, client creation, 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}` } }