diff --git a/jobs/mainloop-p3-bridge.json b/jobs/mainloop-p3-bridge.json
new file mode 100644
index 0000000..0f2fa6d
--- /dev/null
+++ b/jobs/mainloop-p3-bridge.json
@@ -0,0 +1,10 @@
+{
+  "name": "mainloop-p3-bridge",
+  "description": "P3 main_loop rollout (owner 646, ETA 1wk): bridge registry becomes the chat to side-chat map. Fix br-ID collisions (two share br-20261003191930); reconcile main-chat bridge design with BRIDGE_SPEC.md; 646-pip-coord is the topology template.",
+  "schedule": "manual",
+  "agent": "646",
+  "timeout": 3600,
+  "on_failure": "alert",
+  "chain_next": "mainloop-p4-steady",
+  "prompt_template": "Phase 3 bridge plug-in (owner: you, 646). Done when: (1) bridge IDs collision-free; (2) main-chat bridge design reconciled with BRIDGE_SPEC.md and landed; (3) registry drives the main-loop prompt_sidechat map for all four agents. Reply RESULT <job_id> with status per criterion."
+}