delete_filter

Instructions

Implementation Reference

• src/index.ts:1026-1037 (registration)

  Registration of the 'delete_filter' MCP tool. Includes input schema (filter ID), description, and inline handler function that uses handleTool to authenticate and call Gmail API to delete the specified filter.

  server.tool("delete_filter",
    "Deletes a filter",
    {
      id: z.string().describe("The ID of the filter to be deleted")
    },
    async (params) => {
      return handleTool(config, async (gmail: gmail_v1.Gmail) => {
        const { data } = await gmail.users.settings.filters.delete({ userId: 'me', id: params.id })
        return formatResponse(data)
      })
    }
  )

• src/index.ts:1031-1037 (handler)

  Handler function for delete_filter tool. Takes params, uses shared handleTool to validate OAuth2 credentials, create Gmail client, delete filter by ID via Gmail API, and format response.

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

• src/index.ts:1029-1030 (schema)

  Input schema for delete_filter tool using Zod: requires 'id' string (Gmail filter ID).

    id: z.string().describe("The ID of the filter to be deleted")
  },

• src/index.ts:50-66 (helper)

  Shared helper function handleTool used by delete_filter and other tools for OAuth2 authentication, Gmail 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}`
    }
  }

• src/index.ts:48-49 (helper)

  Shared helper to format API responses as MCP content blocks with JSON stringified data.

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