diff --git a/scripts/agent_token.py b/scripts/agent_token.py
new file mode 100644
index 0000000..bb53a5f
--- /dev/null
+++ b/scripts/agent_token.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+"""Mint (or re-mint) the shared agent credential, non-interactively.
+
+Creates the `agents` guest user if missing (random throwaway password — agents
+authenticate by token, not password), mints a fresh API token for it, and writes
+a ready-to-source env file to data/agent.env (chmod 600, gitignored). The token
+is never printed to stdout.
+
+Run from the repo root:
+    uv run python scripts/agent_token.py            # mint, write data/agent.env
+    uv run python scripts/agent_token.py --revoke   # delete ALL of agents' old tokens first
+
+Agents/macs then use:
+    source ~/Documents/MODELBEAST/data/agent.env    # sets MB_HOST + MB_TOKEN
+    ./mb ops
+(from another tailnet mac: scp m3ultra:~/Documents/MODELBEAST/data/agent.env .)
+
+The user is a GUEST on purpose: local operators only (flux_local, bg_remove_local,
+trellis_mac, sf3d, ...) — all free; the owner's paid fal/OpenRouter keys are
+blocked server-side. Mint an owner token from the UI if an agent ever truly needs
+a cloud operator.
+"""
+import argparse
+import secrets
+import sys
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(ROOT))
+from server import auth, db  # noqa: E402
+
+USERNAME = "agents"
+MAX_JOBS = 8  # shared across every agent/mac using this credential
+ENV_PATH = ROOT / "data" / "agent.env"
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--revoke", action="store_true",
+                    help="revoke all existing tokens for the agents user first")
+    args = ap.parse_args()
+
+    con = db.connect()
+    user = auth.get_user_by_name(con, USERNAME)
+    if user is None:
+        user = auth.create_user(con, USERNAME, secrets.token_hex(16),
+                                role="guest", max_active_jobs=MAX_JOBS)
+        print(f"created user '{USERNAME}' (guest, max_jobs={MAX_JOBS})")
+    else:
+        print(f"user '{USERNAME}' exists ({user['role']})")
+
+    if args.revoke:
+        n = con.execute("DELETE FROM api_tokens WHERE user_id = ?", (user["id"],)).rowcount
+        con.commit()
+        print(f"revoked {n} old token(s)")
+
+    raw = auth.create_token(con, user["id"], name="shared-agent-cred")
+    ENV_PATH.parent.mkdir(parents=True, exist_ok=True)
+    ENV_PATH.write_text(
+        "# MODELBEAST shared agent credential — source this file, never commit/paste it\n"
+        "export MB_HOST=http://100.89.131.57:8777\n"
+        f"export MB_TOKEN={raw}\n")
+    ENV_PATH.chmod(0o600)
+    print(f"token written to {ENV_PATH} (not shown; source it to use)")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/server/runner.py b/server/runner.py
index 43567bb..63f4c41 100644
--- a/server/runner.py
+++ b/server/runner.py
@@ -305,6 +305,10 @@ class Runner:
     def _register_outputs(self, con, outdir: Path, job_id: str) -> list[str]:
         result_path = outdir / "result.json"
         registered = []
+        # outputs belong to whoever ran the job — guests see only their own
+        # assets, so registering without user_id hides a guest's results from them
+        row = con.execute("SELECT user_id FROM jobs WHERE id = ?", (job_id,)).fetchone()
+        owner_id = row["user_id"] if row else None
         if result_path.exists():
             result = json.loads(result_path.read_text())
             for out in result.get("outputs", []):
@@ -313,13 +317,14 @@ class Runner:
                     p = outdir / p
                 if p.exists():
                     a = store.register_file(con, p, name=out.get("name"),
-                                            parent_job=job_id, move=True, meta=out.get("meta"))
+                                            parent_job=job_id, move=True, meta=out.get("meta"),
+                                            user_id=owner_id)
                     registered.append(a["id"])
         else:
             for p in sorted(outdir.iterdir()):
                 if p.name == "result.json" or p.name.startswith("."):
                     continue
-                a = store.register_file(con, p, parent_job=job_id, move=True)
+                a = store.register_file(con, p, parent_job=job_id, move=True, user_id=owner_id)
                 registered.append(a["id"])
         return registered