feat(tasks): add skill-templated task graph execution

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

@@ -7,7 +7,7 @@ from fastapi.testclient import TestClient
 from beaver.interfaces.web.app import create_app
 from beaver.services.agent_service import AgentService
 from beaver.services.user_file_resolver import UserFileStorageResolver
-from beaver.services.user_files import LocalUserFileStorage, UserFileService
+from beaver.services.user_files import LocalUserFileStorage, UserFileService, UserFileStorageError
 
 
 def _auth_headers(app, username: str = "alice") -> dict[str, str]:
@@ -191,6 +191,26 @@ def test_user_files_api_authenticated_request_resolves_identity(tmp_path: Path,
     assert seen[0].storage_namespace == "users/alice"
 
 
+def test_user_files_api_reports_storage_errors_as_unavailable(tmp_path: Path, monkeypatch) -> None:
+    service = AgentService(workspace=tmp_path)
+    app = create_app(service=service, manage_service_lifecycle=False)
+
+    class BrokenStorage:
+        async def list_dir(self, path: str):
+            raise UserFileStorageError("User file storage list directory failed: SignatureDoesNotMatch")
+
+    async def fake_service(self):
+        return UserFileService(BrokenStorage())
+
+    monkeypatch.setattr(UserFileStorageResolver, "service", fake_service)
+
+    with TestClient(app) as client:
+        response = client.get("/api/user-files/browse", params={"path": "uploads"}, headers=_auth_headers(app))
+
+    assert response.status_code == 503
+    assert "SignatureDoesNotMatch" in response.json()["detail"]
+
+
 def test_user_files_api_streams_upload_and_enforces_configured_limit(tmp_path: Path, monkeypatch) -> None:
     monkeypatch.setenv("BEAVER_USER_FILES_MAX_UPLOAD_BYTES", "5")
     service = AgentService(workspace=tmp_path)