fix(harness): wrap async-only config tools for sync client execution (#2878)

* fix(harness): wrap async-only config tools for sync clients

* refactor(tools): share async tool sync wrapper

backend/packages/harness/deerflow/mcp/tools.py

@@ -1,11 +1,6 @@
 """Load MCP tools using langchain-mcp-adapters."""
 
-import asyncio
-import atexit
-import concurrent.futures
 import logging
-from collections.abc import Callable
-from typing import Any
 
 from langchain_core.tools import BaseTool
 
@@ -13,46 +8,10 @@ from deerflow.config.extensions_config import ExtensionsConfig
 from deerflow.mcp.client import build_servers_config
 from deerflow.mcp.oauth import build_oauth_tool_interceptor, get_initial_oauth_headers
 from deerflow.reflection import resolve_variable
+from deerflow.tools.sync import make_sync_tool_wrapper
 
 logger = logging.getLogger(__name__)
 
-# Global thread pool for sync tool invocation in async environments
-_SYNC_TOOL_EXECUTOR = concurrent.futures.ThreadPoolExecutor(max_workers=10, thread_name_prefix="mcp-sync-tool")
-
-# Register shutdown hook for the global executor
-atexit.register(lambda: _SYNC_TOOL_EXECUTOR.shutdown(wait=False))
-
-
-def _make_sync_tool_wrapper(coro: Callable[..., Any], tool_name: str) -> Callable[..., Any]:
-    """Build a synchronous wrapper for an asynchronous tool coroutine.
-
-    Args:
-        coro: The tool's asynchronous coroutine.
-        tool_name: Name of the tool (for logging).
-
-    Returns:
-        A synchronous function that correctly handles nested event loops.
-    """
-
-    def sync_wrapper(*args: Any, **kwargs: Any) -> Any:
-        try:
-            loop = asyncio.get_running_loop()
-        except RuntimeError:
-            loop = None
-
-        try:
-            if loop is not None and loop.is_running():
-                # Use global executor to avoid nested loop issues and improve performance
-                future = _SYNC_TOOL_EXECUTOR.submit(asyncio.run, coro(*args, **kwargs))
-                return future.result()
-            else:
-                return asyncio.run(coro(*args, **kwargs))
-        except Exception as e:
-            logger.error(f"Error invoking MCP tool '{tool_name}' via sync wrapper: {e}", exc_info=True)
-            raise
-
-    return sync_wrapper
-
 
 async def get_mcp_tools() -> list[BaseTool]:
     """Get all tools from enabled MCP servers.
@@ -126,7 +85,7 @@ async def get_mcp_tools() -> list[BaseTool]:
         # Patch tools to support sync invocation, as deerflow client streams synchronously
         for tool in tools:
             if getattr(tool, "func", None) is None and getattr(tool, "coroutine", None) is not None:
-                tool.func = _make_sync_tool_wrapper(tool.coroutine, tool.name)
+                tool.func = make_sync_tool_wrapper(tool.coroutine, tool.name)
 
         return tools
 

backend/packages/harness/deerflow/tools/skill_manage_tool.py

@@ -10,11 +10,11 @@ from weakref import WeakValueDictionary
 from langchain.tools import tool
 
 from deerflow.agents.lead_agent.prompt import refresh_skills_system_prompt_cache_async
-from deerflow.mcp.tools import _make_sync_tool_wrapper
 from deerflow.skills.security_scanner import scan_skill_content
 from deerflow.skills.storage import get_or_new_skill_storage
 from deerflow.skills.storage.skill_storage import SkillStorage
 from deerflow.skills.types import SKILL_MD_FILE
+from deerflow.tools.sync import make_sync_tool_wrapper
 from deerflow.tools.types import Runtime
 
 logger = logging.getLogger(__name__)
@@ -235,4 +235,4 @@ async def skill_manage_tool(
     )
 
 
-skill_manage_tool.func = _make_sync_tool_wrapper(_skill_manage_impl, "skill_manage")
+skill_manage_tool.func = make_sync_tool_wrapper(_skill_manage_impl, "skill_manage")

backend/packages/harness/deerflow/tools/sync.py

@@ -0,0 +1,36 @@
+"""Utilities for invoking async tools from synchronous agent paths."""
+
+import asyncio
+import atexit
+import concurrent.futures
+import logging
+from collections.abc import Callable
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+# Shared thread pool for sync tool invocation in async environments.
+_SYNC_TOOL_EXECUTOR = concurrent.futures.ThreadPoolExecutor(max_workers=10, thread_name_prefix="tool-sync")
+
+atexit.register(lambda: _SYNC_TOOL_EXECUTOR.shutdown(wait=False))
+
+
+def make_sync_tool_wrapper(coro: Callable[..., Any], tool_name: str) -> Callable[..., Any]:
+    """Build a synchronous wrapper for an asynchronous tool coroutine."""
+
+    def sync_wrapper(*args: Any, **kwargs: Any) -> Any:
+        try:
+            loop = asyncio.get_running_loop()
+        except RuntimeError:
+            loop = None
+
+        try:
+            if loop is not None and loop.is_running():
+                future = _SYNC_TOOL_EXECUTOR.submit(asyncio.run, coro(*args, **kwargs))
+                return future.result()
+            return asyncio.run(coro(*args, **kwargs))
+        except Exception as e:
+            logger.error("Error invoking tool %r via sync wrapper: %s", tool_name, e, exc_info=True)
+            raise
+
+    return sync_wrapper

backend/packages/harness/deerflow/tools/tools.py

@@ -8,6 +8,7 @@ from deerflow.reflection import resolve_variable
 from deerflow.sandbox.security import is_host_bash_allowed
 from deerflow.tools.builtins import ask_clarification_tool, present_file_tool, task_tool, view_image_tool
 from deerflow.tools.builtins.tool_search import reset_deferred_registry
+from deerflow.tools.sync import make_sync_tool_wrapper
 
 logger = logging.getLogger(__name__)
 
@@ -33,6 +34,13 @@ def _is_host_bash_tool(tool: object) -> bool:
     return False
 
 
+def _ensure_sync_invocable_tool(tool: BaseTool) -> BaseTool:
+    """Attach a sync wrapper to async-only tools used by sync agent callers."""
+    if getattr(tool, "func", None) is None and getattr(tool, "coroutine", None) is not None:
+        tool.func = make_sync_tool_wrapper(tool.coroutine, tool.name)
+    return tool
+
+
 def get_available_tools(
     groups: list[str] | None = None,
     include_mcp: bool = True,
@@ -77,7 +85,7 @@ def get_available_tools(
                 cfg.use,
             )
 
-    loaded_tools = [t for _, t in loaded_tools_raw]
+    loaded_tools = [_ensure_sync_invocable_tool(t) for _, t in loaded_tools_raw]
 
     # Conditionally add tools based on config
     builtin_tools = BUILTIN_TOOLS.copy()