fix(harness): wrap all async-only tools for sync clients (#2935)

backend/tests/test_tool_deduplication.py

@@ -95,6 +95,64 @@ def test_config_loaded_async_only_tool_gets_sync_wrapper(mock_bash, mock_cfg):
     assert async_tool.invoke({"x": 42}) == "result: 42"
 
 
+@patch("deerflow.tools.tools.get_app_config")
+@patch("deerflow.tools.tools.is_host_bash_allowed", return_value=True)
+def test_subagent_async_only_tool_gets_sync_wrapper(mock_bash, mock_cfg):
+    """Async-only tools added through the subagent path can be invoked by sync clients."""
+
+    async def async_tool_impl(x: int) -> str:
+        return f"subagent: {x}"
+
+    async_tool = StructuredTool(
+        name="async_subagent_tool",
+        description="Async-only subagent test tool.",
+        args_schema=AsyncToolArgs,
+        func=None,
+        coroutine=async_tool_impl,
+    )
+    mock_cfg.return_value = _make_minimal_config([])
+
+    with (
+        patch("deerflow.tools.tools.BUILTIN_TOOLS", []),
+        patch("deerflow.tools.tools.SUBAGENT_TOOLS", [async_tool]),
+    ):
+        result = get_available_tools(include_mcp=False, subagent_enabled=True, app_config=mock_cfg.return_value)
+
+    assert async_tool in result
+    assert async_tool.func is not None
+    assert async_tool.invoke({"x": 7}) == "subagent: 7"
+
+
+@patch("deerflow.tools.tools.get_app_config")
+@patch("deerflow.tools.tools.is_host_bash_allowed", return_value=True)
+def test_acp_async_only_tool_gets_sync_wrapper(mock_bash, mock_cfg):
+    """Async-only ACP tools can be invoked by sync clients."""
+
+    async def async_tool_impl(x: int) -> str:
+        return f"acp: {x}"
+
+    async_tool = StructuredTool(
+        name="invoke_acp_agent",
+        description="Async-only ACP test tool.",
+        args_schema=AsyncToolArgs,
+        func=None,
+        coroutine=async_tool_impl,
+    )
+    config = _make_minimal_config([])
+    config.acp_agents = {"codex": object()}
+    mock_cfg.return_value = config
+
+    with (
+        patch("deerflow.tools.tools.BUILTIN_TOOLS", []),
+        patch("deerflow.tools.builtins.invoke_acp_agent_tool.build_invoke_acp_agent_tool", return_value=async_tool),
+    ):
+        result = get_available_tools(include_mcp=False, app_config=config)
+
+    assert async_tool in result
+    assert async_tool.func is not None
+    assert async_tool.invoke({"x": 9}) == "acp: 9"
+
+
 @patch("deerflow.tools.tools.get_app_config")
 @patch("deerflow.tools.tools.is_host_bash_allowed", return_value=True)
 def test_no_duplicates_returned(mock_bash, mock_cfg):