--- a/runner/core.py
+++ b/runner/core.py
@@ -107,7 +107,7 @@
         require(not event.get("error"), "Antigravity provider error")
         step = event.get("step_update")
         require(isinstance(step, dict), "Antigravity malformed step")
-        require(step.get("step_type") in ("tool", "agent_response", "checkpoint", "finish")
+        require(step.get("step_type") in ("user_input", "tool", "agent_response", "checkpoint", "finish")
                 and step.get("state") in ("ACTIVE", "DONE", "ERROR"), "Antigravity unknown step")
         require(not step.get("error"), "Antigravity provider error")
         info = step.get("tool_info", {})