Python: Refactor RequestInfoExecutor (#1403)

* Refactor RequestInfoExecutor

* Update AI script

* Fix formatting

* Address comments

* fix unit test

python/samples/getting_started/workflows/agents/workflow_as_agent_human_in_the_loop.py

@@ -5,7 +5,7 @@ import sys
 from collections.abc import Mapping
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Any, cast
+from typing import Any
 
 # Ensure local getting_started package can be imported when running as a script.
 _SAMPLES_ROOT = Path(__file__).resolve().parents[3]
@@ -150,23 +150,17 @@ async def main() -> None:
         else:
             raise TypeError("Unexpected argument type for human review function call.")
 
-        request_payload_obj: Any = request.data
-        if not isinstance(request_payload_obj, Mapping):
-            raise ValueError("Human review request payload must be a mapping.")
-        request_payload = cast(Mapping[str, Any], request_payload_obj)
+        request_payload: Any = request.data
+        if not isinstance(request_payload, HumanReviewRequest):
+            raise ValueError("Human review request payload must be a HumanReviewRequest.")
 
-        agent_request_obj = request_payload.get("agent_request")
-        if not isinstance(agent_request_obj, Mapping):
-            raise ValueError("Human review request must include agent_request mapping data.")
-        agent_request_data = cast(Mapping[str, Any], agent_request_obj)
-
-        request_id_obj = agent_request_data.get("request_id")
-        if not isinstance(request_id_obj, str):
-            raise ValueError("Human review request_id must be a string.")
-        request_id_value = request_id_obj
+        agent_request = request_payload.agent_request
+        if agent_request is None:
+            raise ValueError("Human review request must include agent_request.")
 
+        request_id = agent_request.request_id
         # Mock a human response approval for demonstration purposes.
-        human_response = ReviewResponse(request_id=request_id_value, feedback="Approved", approved=True)
+        human_response = ReviewResponse(request_id=request_id, feedback="Approved", approved=True)
 
         # Create the function call result object to send back to the agent.
         human_review_function_result = FunctionResultContent(