sync update from LAN repo (source dhk-1 @ 3e87be55)

offline-backend-20260512/backend/tests/test_workflow_engine.py

@@ -1074,6 +1074,50 @@ async def test_skill_node_invokes_agent_with_restricted_skills() -> None:
     assert "储能" in seen["prompt"]
 
 
+@pytest.mark.asyncio
+async def test_skill_node_rechecks_live_availability_before_invocation() -> None:
+    agent_called = False
+
+    async def run_agent(**_kwargs: Any) -> dict[str, Any]:
+        nonlocal agent_called
+        agent_called = True
+        return {"text": "must not run"}
+
+    async def resolve_enabled_skills() -> set[str]:
+        return {"some-other-skill"}
+
+    graph = _graph(
+        [
+            {"id": "start", "type": "start"},
+            {
+                "id": "skill",
+                "type": "skill",
+                "config": {
+                    "agentId": "collector",
+                    "skillNames": ["web_search"],
+                    "promptTemplate": "查资料",
+                    "mode": "agent_skill",
+                },
+            },
+        ],
+        [{"id": "e1", "source": "start", "target": "skill"}],
+    )
+
+    with pytest.raises(WorkflowError) as exc:
+        await _run(
+            graph,
+            deps=WorkflowRuntimeDeps(
+                run_agent=run_agent,
+                resolve_enabled_skills=resolve_enabled_skills,
+            ),
+        )
+
+    assert exc.value.code == "WORKFLOW_RESOURCE_MISSING"
+    assert exc.value.node_id == "skill"
+    assert exc.value.details == {"skillNames": ["web_search"]}
+    assert agent_called is False
+
+
 @pytest.mark.asyncio
 async def test_callable_skill_mode_is_rejected() -> None:
     graph = _graph(