Using agent as tool outside of adk web doesn't exit cleanly #1112
Description
Describe the bug
I have a program which I run directly (outside of adk web) and works properly.
But as soon as I add an other as a tool to this agent, it doesn't exit cleanly.
State after agent run: {}
Agent finished. Stack exited cleanly.
Warning: Error during MCP session cleanup: Attempted to exit a cancel scope that isn't the current tasks's current cancel scope
Warning: Error during MCP session cleanup: Attempted to exit a cancel scope that isn't the current tasks's current cancel scope
Warning: Error during MCP session cleanup: Attempted to exit a cancel scope that isn't the current tasks's current cancel scope
an error occurred during closing of asynchronous generator <async_generator object stdio_client at 0x112874040>
asyncgen: <async_generator object stdio_client at 0x112874040>
+ Exception Group Traceback (most recent call last):
| File "/Users/denisjannot/Documents/ai/adk/venv/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 772, in __aexit__
| raise BaseExceptionGroup(
| BaseExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "/Users/denisjannot/Documents/ai/adk/venv/lib/python3.12/site-packages/mcp/client/stdio/__init__.py", line 177, in stdio_client
| yield read_stream, write_stream
| GeneratorExit
+------------------------------------
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Users/denisjannot/Documents/ai/adk/venv/lib/python3.12/site-packages/mcp/client/stdio/__init__.py", line 170, in stdio_client
async with (
File "/Users/denisjannot/Documents/ai/adk/venv/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 778, in __aexit__
if self.cancel_scope.__exit__(type(exc), exc, exc.__traceback__):
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/denisjannot/Documents/ai/adk/venv/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line 457, in __exit__
raise RuntimeError(
RuntimeError: Attempted to exit cancel scope in a different task than it was entered in
To Reproduce
Add an agent as a tool using:
sub_agent = create_sub_agent()
agent_as_tool = AgentTool(agent=sub_agent)
Note that the sub agent has a MCP tool.