list_labels
Retrieve all email labels from your Gmail account to organize and categorize messages effectively.
Instructions
List all labels in the user's mailbox
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||
Implementation Reference
- src/index.ts:451-456 (handler)The handler function for the 'list_labels' tool. It uses the shared handleTool to authenticate, create a Gmail client, call gmail.users.labels.list({ userId: 'me' }), and format the response.
async () => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.labels.list({ userId: 'me' }) return formatResponse(data) }) } - src/index.ts:448-457 (registration)Registration of the 'list_labels' MCP tool using server.tool(), including description, empty input schema (no parameters), and inline handler.
server.tool("list_labels", "List all labels in the user's mailbox", {}, async () => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.labels.list({ userId: 'me' }) return formatResponse(data) }) } ) - src/index.ts:450-450 (schema)Input schema for list_labels tool: empty object Zod schema (takes no parameters).
{}, - src/index.ts:49-65 (helper)Shared helper function 'handleTool' used by list_labels (and other tools) to handle OAuth2 authentication, credential validation, Gmail client creation, API 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 helper 'formatResponse' used to format the Gmail API response into MCP-compatible content structure.
const formatResponse = (response: any) => ({ content: [{ type: "text", text: JSON.stringify(response) }] })