fix(examples): remove not needed BaseSessionService injection in chatkit servers

Author: ksachdeva

examples/backend/src/backend/agents/airline/_server.py

@@ -11,7 +11,6 @@
 )
 from google.adk.agents.run_config import RunConfig, StreamingMode
 from google.adk.models.lite_llm import LiteLlm
-from google.adk.sessions import BaseSessionService
 from google.genai import types as genai_types
 
 from backend._config import Settings
@@ -47,13 +46,11 @@ class AirlineSupportChatkitServer(ChatKitServer[ADKContext]):
     def __init__(
         self,
         store: ADKStore,
-        session_service: BaseSessionService,
         runner_manager: RunnerManager,
         settings: Settings,
     ) -> None:
         super().__init__(store)
         agent = _make_airline_support_agent(settings)
-        self._session_service = session_service
         self._runner = runner_manager.add_runner(settings.AIRLINE_APP_NAME, agent)
 
     async def respond(

examples/backend/src/backend/agents/facts/_server.py

@@ -47,13 +47,11 @@ class FactsChatkitServer(ChatKitServer[ADKContext]):
     def __init__(
         self,
         store: ADKStore,
-        session_service: BaseSessionService,
         runner_manager: RunnerManager,
         settings: Settings,
     ) -> None:
         super().__init__(store)
         agent = _make_facts_agent(settings)
-        self._session_service = session_service
         self._runner = runner_manager.add_runner(settings.FACTS_APP_NAME, agent)
 
     async def respond(

examples/backend/src/backend/agents/knowledge/_server.py

@@ -17,7 +17,6 @@
 )
 from google.adk.agents.run_config import RunConfig, StreamingMode
 from google.adk.models.lite_llm import LiteLlm
-from google.adk.sessions import BaseSessionService
 from google.genai import types as genai_types
 from langchain_core.vectorstores import VectorStore
 
@@ -26,13 +25,10 @@
 
 from ._agent import KnowledgeAgent
 from ._documents import (
-    DOCUMENTS,
     DOCUMENTS_BY_FILENAME,
-    DOCUMENTS_BY_ID,
     DOCUMENTS_BY_SLUG,
     DOCUMENTS_BY_STEM,
     DocumentMetadata,
-    as_dicts,
 )
 from ._tools import Searcher
 
@@ -158,7 +154,6 @@ class KnowledgeAssistantChatkitServer(ChatKitServer[ADKContext]):
     def __init__(
         self,
         store: ADKStore,
-        session_service: BaseSessionService,
         runner_manager: RunnerManager,
         settings: Settings,
         vector_store: VectorStore,
@@ -167,7 +162,6 @@ def __init__(
         self._vector_store = vector_store
         searcher = Searcher(vector_store=self._vector_store)
         agent = _make_knowledge_agent(settings, searcher)
-        self._session_service = session_service
         self._store = store
         self._runner = runner_manager.add_runner(settings.KNOWLEDGE_APP_NAME, agent)