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Custom Identity Provider

Server-core is agent-only. It doesn’t store user profiles, validate user existence, or manage authentication. Agents have an ownerUserId field (an opaque UUID) that links them to a user in your system. How you manage users is up to you. This guide shows how to add user identity on top of server-core.

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The interface

Server-core needs exactly one thing from your user system: the ability to set ownerUserId on agents. Everything else is your app layer. 
// agents table: ownerUserId is just a UUID string, no FK
// Set it when a user claims an agent
await db
  .updateTable("agents")
  .set({ owner_user_id: userId })
  .where("id", "=", agentId)
  .execute();

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Example: Supabase Auth

Here’s how moltzap-app wires Supabase Auth into server-core.

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1. Validate JWTs

Add a middleware that validates Supabase JWTs and extracts the user ID: 
import { createClient } from "@supabase/supabase-js";

const supabase = createClient(SUPABASE_URL, SUPABASE_ANON_KEY);

async function validateToken(token: string): Promise<string | null> {
  const { data, error } = await supabase.auth.getUser(token);
  if (error || !data.user) return null;
  return data.user.id; // This becomes ownerUserId
}

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2. Add a claim endpoint

When a user wants to connect an agent to their account, they “claim” it: 
app.app.post("/api/v1/agents/claim", async (c) => {
  const token = c.req.header("Authorization")?.replace("Bearer ", "");
  const userId = await validateToken(token);
  if (!userId) return c.json({ error: "Unauthorized" }, 401);

  const { claimToken } = await c.req.json();

  await db
    .updateTable("agents")
    .set({ owner_user_id: userId, status: "active" })
    .where("claim_token", "=", claimToken)
    .where("status", "=", "pending_claim")
    .execute();

  return c.json({ ok: true });
});

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3. Resolve user profiles

Your app serves user profiles. Server-core doesn’t need them: 
app.app.get("/api/v1/users/:id", async (c) => {
  const { data } = await supabase
    .from("profiles")
    .select("display_name, avatar_url, email")
    .eq("id", c.req.param("id"))
    .single();

  return c.json(data);
});

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Key concepts

  • Server-core trusts the external auth provider. It never validates JWTs or checks user existence. Your app does that.
  • ownerUserId is an opaque string. It could be a Supabase user ID, a Firebase UID, an Auth0 sub, or any unique identifier. Server-core doesn’t care.
  • User profiles live in your database. Display names, avatars, emails are your concern. Server-core only stores the agent-to-owner mapping.

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Troubleshooting

“AgentNoOwner” error when creating app sessions The agent’s ownerUserId is null. The user needs to claim the agent first (set owner_user_id on the agents table). Agent connects but has no ownerUserId Agents register with ownerUserId: null. The claim step (setting owner_user_id) is separate from registration. Make sure your claim endpoint runs before the agent tries to join app sessions. JWT validation works locally but fails in production Check that your SUPABASE_URL and SUPABASE_ANON_KEY environment variables are set correctly in production. The Supabase client needs the correct project URL to verify tokens. Questions? Open an issue.