feat(agent-tool): support propagating runner plugins

Author: davidkl97

src/google/adk/tools/agent_tool.py

@@ -45,11 +45,13 @@ class AgentTool(BaseTool):
   Attributes:
     agent: The agent to wrap.
     skip_summarization: Whether to skip summarization of the agent output.
+    include_plugins: Whether to include plugins from parent runner context
   """
 
-  def __init__(self, agent: BaseAgent, skip_summarization: bool = False):
+  def __init__(self, agent: BaseAgent, skip_summarization: bool = False, include_plugins: bool = False):
     self.agent = agent
     self.skip_summarization: bool = skip_summarization
+    self.include_plugins = include_plugins
 
     super().__init__(name=agent.name, description=agent.description)
 
@@ -125,13 +127,15 @@ async def run_async(
           role='user',
           parts=[types.Part.from_text(text=args['request'])],
       )
+    plugins = self.agent.root_agent if self.include_plugins else None
     runner = Runner(
         app_name=self.agent.name,
         agent=self.agent,
         artifact_service=ForwardingArtifactService(tool_context),
         session_service=InMemorySessionService(),
         memory_service=InMemoryMemoryService(),
         credential_service=tool_context._invocation_context.credential_service,
+        plugins=plugins
     )
     session = await runner.session_service.create_session(
         app_name=self.agent.name,