google.adk.a2a.executor.a2a_agent_executor.A2aAgentExecutor
https://github.com/google/adk-python/blob/v1.25.0/src/google/adk/a2a/executor/a2a_agent_executor.py#L75
runner: google.adk.runners.Runner
config
デフォルトはA2aAgentExecutorConfig https://github.com/google/adk-python/blob/v1.23.0/src/google/adk/a2a/executor/a2a_agent_executor.py#L59
request_converter = google.adk.a2a.converters.request_converter.convert_a2a_request_to_agent_run_request
execute() https://github.com/google/adk-python/blob/v1.25.0/src/google/adk/a2a/executor/a2a_agent_executor.py#L122
self._handle_request()
self._resolve_runner()
self._prepare_session()
runner.run_async()