Gmail MCP

Instructions

Implementation Reference

• src/index.ts:1256-1268 (registration)

  Registration of the 'set_default_smime_info' tool. Includes input schema (sendAsEmail and id), description, and inline handler function that validates OAuth credentials via handleTool and calls the Gmail API gmail.users.settings.sendAs.smimeInfo.setDefault to set the default S/MIME configuration for the specified send-as alias.

  server.tool("set_default_smime_info",
    "Sets the default S/MIME config for the specified send-as alias",
    {
      sendAsEmail: z.string().describe("The email address that appears in the 'From:' header"),
      id: z.string().describe("The immutable ID for the S/MIME config")
    },
    async (params) => {
      return handleTool(config, async (gmail: gmail_v1.Gmail) => {
        const { data } = await gmail.users.settings.sendAs.smimeInfo.setDefault({ userId: 'me', sendAsEmail: params.sendAsEmail, id: params.id })
        return formatResponse(data)
      })
    }
  )

• src/index.ts:1262-1267 (handler)

  The handler function for the tool, which uses the shared handleTool utility to create/authenticate a Gmail client and invoke the setDefault method on smimeInfo for the given sendAsEmail and id.

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

• src/index.ts:1258-1261 (schema)

  Zod schema defining the input parameters: sendAsEmail (string) and id (string).

  {
    sendAsEmail: z.string().describe("The email address that appears in the 'From:' header"),
    id: z.string().describe("The immutable ID for the S/MIME config")
  },