From 37330b770323a4ab2b83d48dae5f3db0414e69a4 Mon Sep 17 00:00:00 2001
From: Yufeng He <40085740+he-yufeng@users.noreply.github.com>
Date: Tue, 12 May 2026 16:38:49 +0800
Subject: [PATCH] fix: run sync tools off event loop

---
 .../packages/core/agent_framework/_tools.py   | 15 ++++++++---
 python/packages/core/tests/core/test_tools.py | 25 +++++++++++++++++++
 2 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/python/packages/core/agent_framework/_tools.py b/python/packages/core/agent_framework/_tools.py
index 93722a8987..d18c13f7e3 100644
--- a/python/packages/core/agent_framework/_tools.py
+++ b/python/packages/core/agent_framework/_tools.py
@@ -537,6 +537,15 @@ def __call__(self, *args: Any, **kwargs: Any) -> Any:
             self.invocation_exception_count += 1
             raise
 
+    async def _invoke_function(self, call_kwargs: Mapping[str, Any]) -> Any:
+        """Run sync tools off the event loop during async invocation."""
+        func = self.func.func if isinstance(self.func, FunctionTool) else self.func
+        if inspect.iscoroutinefunction(func):
+            return await self.__call__(**call_kwargs)
+
+        res = await asyncio.to_thread(self.__call__, **call_kwargs)
+        return await res if inspect.isawaitable(res) else res
+
     @overload
     async def invoke(
         self,
@@ -679,8 +688,7 @@ async def invoke(
         if not OBSERVABILITY_SETTINGS.ENABLED:  # type: ignore[name-defined]
             logger.info(f"Function name: {self.name}")
             logger.debug(f"Function arguments: {observable_kwargs}")
-            res = self.__call__(**call_kwargs)
-            result = await res if inspect.isawaitable(res) else res
+            result = await self._invoke_function(call_kwargs)
             if skip_parsing:
                 logger.info(f"Function {self.name} succeeded.")
                 logger.debug(f"Function result: {type(result).__name__}")
@@ -730,8 +738,7 @@ async def invoke(
             start_time_stamp = perf_counter()
             end_time_stamp: float | None = None
             try:
-                res = self.__call__(**call_kwargs)
-                result = await res if inspect.isawaitable(res) else res
+                result = await self._invoke_function(call_kwargs)
                 end_time_stamp = perf_counter()
             except Exception as exception:
                 end_time_stamp = perf_counter()
diff --git a/python/packages/core/tests/core/test_tools.py b/python/packages/core/tests/core/test_tools.py
index b3762bf4ef..ee15e8d16f 100644
--- a/python/packages/core/tests/core/test_tools.py
+++ b/python/packages/core/tests/core/test_tools.py
@@ -1,4 +1,6 @@
 # Copyright (c) Microsoft. All rights reserved.
+import asyncio
+import threading
 from typing import Annotated, Any, Literal, get_args, get_origin
 from unittest.mock import Mock
 
@@ -1346,6 +1348,29 @@ async def slow(x: int) -> int:
     assert raw == 42
 
 
+async def test_invoke_sync_tool_does_not_block_event_loop() -> None:
+    release_tool = threading.Event()
+    tool_thread_ids: list[int] = []
+    event_loop_thread_id = threading.get_ident()
+
+    @tool
+    def wait_for_release() -> str:
+        tool_thread_ids.append(threading.get_ident())
+        return "released" if release_tool.wait(timeout=0.2) else "timed out"
+
+    async def release_soon() -> None:
+        await asyncio.sleep(0.01)
+        release_tool.set()
+
+    tool_task = asyncio.create_task(wait_for_release.invoke(skip_parsing=True))
+    release_task = asyncio.create_task(release_soon())
+
+    assert await asyncio.wait_for(tool_task, timeout=1) == "released"
+    await release_task
+    assert tool_thread_ids
+    assert tool_thread_ids[0] != event_loop_thread_id
+
+
 async def test_invoke_skip_parsing_bypasses_configured_result_parser() -> None:
     """The tool's own result_parser is bypassed when skip_parsing=True is requested."""
     parser_calls: list[Any] = []