MCP server authenticate as user?

[ckreiling]

I'm having an awesome time with Convex and the MCP server. However I am looking for assistance with using the MCP server to call functions requiring user authentication.

Take for example this query:

export const listThreads = query({
  args: {
    paginationOpts: paginationOptsValidator,
  },

  handler: async (ctx, args) => {
    const userId = await getAuthUserId(ctx);
    if (userId === null) {
      throw new Error("User must be authenticated to list threads.");
    }

    return await ctx.db
      .query("userThreads")
      .withIndex("by_user", (thread) => thread.eq("userId", userId))
      .order("desc")
      .paginate(args.paginationOpts);
  },
});

When an LLM attempts to use the MCP server to call this function it will get the User must be authenticated to request threads error because it does not operate as a user.

Is there some way for the MCP server to authenticate and act as a user in order to call these sorts of authenticated functions? It's unclear whether this is supported/possible

[thomasballinger]

Hi @ckreiling, makes sense, let's make a way to specify user credentials similar to the function runner in the dashboard.

No, there's currently no way to do this from the MCP server.