fix(fastapi): pass state_delta to runner in /run endpoint

Author: pguerra-ce

src/google/adk/cli/adk_web_server.py

@@ -993,6 +993,7 @@ async def run_agent(req: RunAgentRequest) -> list[Event]:
               user_id=req.user_id,
               session_id=req.session_id,
               new_message=req.new_message,
+              state_delta=req.state_delta,
           )
       ) as agen:
         events = [event async for event in agen]

tests/unittests/cli/test_fast_api.py

@@ -110,6 +110,7 @@ async def dummy_run_async(
     user_id,
     session_id,
     new_message,
+    state_delta=None,
     run_config: RunConfig = RunConfig(),
 ):
   yield _event_1()
@@ -743,6 +744,44 @@ def test_agent_run(test_app, create_test_session):
 
   logger.info("Agent run test completed successfully")
 
+def test_agent_run_passes_state_delta(test_app, create_test_session, monkeypatch):
+  """Test /run forwards state_delta to Runner.run_async."""
+  captured = {}
+
+  async def spy_run_async(
+      self,
+      *,
+      user_id,
+      session_id,
+      new_message,
+      state_delta=None,
+      run_config=None,
+  ):
+    captured["user_id"] = user_id
+    captured["session_id"] = session_id
+    captured["state_delta"] = state_delta
+    if False:  # make this an async generator
+      yield
+
+  monkeypatch.setattr(Runner, "run_async", spy_run_async)
+
+  info = create_test_session
+  payload = {
+      "app_name": info["app_name"],
+      "user_id": info["user_id"],
+      "session_id": info["session_id"],
+      "new_message": {"role": "user", "parts": [{"text": "Hello"}]},
+      "streaming": False,
+      "state_delta": {"k": "v", "count": 1},
+  }
+
+  response = test_app.post("/run", json=payload)
+  assert response.status_code == 200
+  assert isinstance(response.json(), list)
+
+  assert captured["user_id"] == info["user_id"]
+  assert captured["session_id"] == info["session_id"]
+  assert captured["state_delta"] == payload["state_delta"]
 
 def test_list_artifact_names(test_app, create_test_session):
   """Test listing artifact names for a session."""