Lean MCP implementation

src/va_agent/agent.py

@@ -0,0 +1,29 @@
+"""ADK agent with vector search RAG tool."""
+
+from google import genai
+from google.adk.agents.llm_agent import Agent
+from google.adk.runners import Runner
+from google.adk.tools.mcp_tool import McpToolset
+from google.adk.tools.mcp_tool.mcp_session_manager import SseConnectionParams
+from google.cloud.firestore_v1.async_client import AsyncClient
+
+from va_agent.config import settings
+from va_agent.session import FirestoreSessionService
+
+connection_params = SseConnectionParams(url=settings.mcp_remote_url)
+toolset = McpToolset(connection_params=connection_params)
+
+agent = Agent(
+    model=settings.agent_model,
+    name=settings.agent_name,
+    instruction=settings.agent_instructions,
+    tools=[toolset],
+)
+
+session_service = FirestoreSessionService(
+    db=AsyncClient(database=settings.firestore_db),
+    compaction_token_threshold=10_000,
+    genai_client=genai.Client(),
+)
+
+runner = Runner(app_name="va_agent", agent=agent, session_service=session_service)