chore(engine): compact llm request snapshots

app-instance/backend/tests/unit/test_phase5_skills_runtime.py

@@ -633,3 +633,23 @@ def test_agent_loop_records_max_tool_iterations_as_failed_skill_effect(tmp_path:
     effect_records = loaded.run_memory_store.list_skill_effects("docker-debug", version="v0007")
     assert effect_records[-1].run_id == result.run_id
     assert effect_records[-1].success is False
+
+
+def test_llm_request_snapshot_defaults_to_compact_payload(tmp_path: Path) -> None:
+    loop = AgentLoop(loader=EngineLoader(workspace=tmp_path, skill_assembler=StubSkillAssembler([])))
+    bundle = ProviderBundle(
+        main_runtime=SimpleNamespace(model="stub-model", provider_name="stub"),
+        main_provider=StubProvider(
+            [LLMResponse(content="done", finish_reason="stop", provider_name="stub", model="stub-model")]
+        ),
+    )
+
+    result = asyncio.run(loop.process_direct("hello", provider_bundle=bundle))
+    loaded = loop.boot()
+    events = loaded.session_manager.get_run_event_records(result.session_id, result.run_id)
+    snapshot = next(event for event in events if event.event_type == "llm_request_snapshotted")
+
+    assert "message_count" in snapshot.event_payload
+    assert "tool_names" in snapshot.event_payload
+    assert "messages" not in snapshot.event_payload
+    assert "tools" not in snapshot.event_payload