modify_thread
Change labels on Gmail threads to organize email conversations by adding or removing specific labels from selected threads.
Instructions
Modify the labels applied to a thread
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | The ID of the thread to modify | |
| addLabelIds | No | A list of label IDs to add to the thread | |
| removeLabelIds | No | A list of label IDs to remove from the thread |
Implementation Reference
- src/index.ts:789-803 (registration)Registration of the 'modify_thread' MCP tool, including input schema (thread ID, optional add/remove label IDs), description, and handler function that uses the Gmail API to modify labels on a specified thread.server.tool("modify_thread", "Modify the labels applied to a thread", { id: z.string().describe("The ID of the thread to modify"), addLabelIds: z.array(z.string()).optional().describe("A list of label IDs to add to the thread"), removeLabelIds: z.array(z.string()).optional().describe("A list of label IDs to remove from the thread") }, async (params) => { const { id, ...threadData } = params return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.threads.modify({ userId: 'me', id, requestBody: threadData }) return formatResponse(data) }) } )
- src/index.ts:796-802 (handler)The handler function for the 'modify_thread' tool. Destructures params into id and threadData (addLabelIds/removeLabelIds), then uses handleTool helper to authenticate and call gmail.users.threads.modify API endpoint.async (params) => { const { id, ...threadData } = params return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.threads.modify({ userId: 'me', id, requestBody: threadData }) return formatResponse(data) }) }
- src/index.ts:792-795 (schema)Input schema for 'modify_thread' tool using Zod: requires thread 'id', optional arrays of 'addLabelIds' and 'removeLabelIds'.id: z.string().describe("The ID of the thread to modify"), addLabelIds: z.array(z.string()).optional().describe("A list of label IDs to add to the thread"), removeLabelIds: z.array(z.string()).optional().describe("A list of label IDs to remove from the thread") },
- src/index.ts:50-80 (helper)Shared 'handleTool' helper used by 'modify_thread' and other tools: handles OAuth2 authentication, Gmail client creation, API call execution, and error handling (including auth-specific 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) { // Check for specific authentication errors if ( error.message?.includes("invalid_grant") || error.message?.includes("refresh_token") || error.message?.includes("invalid_client") || error.message?.includes("unauthorized_client") || error.code === 401 || error.code === 403 ) { return formatResponse({ error: `Authentication failed: ${error.message}. Please re-authenticate by running: npx @shinzolabs/gmail-mcp auth`, }); } return formatResponse({ error: `Tool execution failed: ${error.message}` }); } }