UFO2 agent trying to incorrectly call click_input tool

[Sorcecoder]

[03/11/26 12:33:17] ERROR Error calling tool 'click_input' tool_manager.py:226
╭───────────────── Traceback (most recent call last) ─────────────────╮
│ C:\Users\skadmin\anaconda3\envs\ufo\lib\site-packages\fastmcp\tools │
│ \tool_manager.py:222 in call_tool │
│ │
│ 219 │ │ │ │ raise NotFoundError(f"Tool {key!r} not found" │
│ 220 │ │ │ │
│ 221 │ │ │ try: │
│ ❱ 222 │ │ │ │ return await tool.run(arguments) │
│ 223 │ │ │ │
│ 224 │ │ │ # raise ToolErrors as-is │
│ 225 │ │ │ except ToolError as e: │
│ │
│ C:\Users\skadmin\anaconda3\envs\ufo\lib\site-packages\fastmcp\tools │
│ \tool.py:295 in run │
│ │
│ 292 │ │ │ arguments[context_kwarg] = get_context() │
│ 293 │ │ │
│ 294 │ │ type_adapter = get_cached_typeadapter(self.fn) │
│ ❱ 295 │ │ result = type_adapter.validate_python(arguments) │
│ 296 │ │ │
│ 297 │ │ if inspect.isawaitable(result): │
│ 298 │ │ │ result = await result │
│ │
│ C:\Users\skadmin\anaconda3\envs\ufo\lib\site-packages\pydantic\type │
│ _adapter.py:421 in validate_python │
│ │
│ 418 │ │ │ │ code='validate-by-alias-and-name-false', │
│ 419 │ │ │ ) │
│ 420 │ │ │
│ ❱ 421 │ │ return self.validator.validate_python( │
│ 422 │ │ │ object, │
│ 423 │ │ │ strict=strict, │
│ 424 │ │ │ from_attributes=from_attributes, │
│ │
│ C:\Users\skadmin\UFO\ufo\client\mcp\local_servers\ui_mcp_server.py: │
│ 310 in click_input │
│ │
│ 307 │ │ Click on a UI control element using the mouse. All ty │
│ supported. │
│ 308 │ │ """ │
│ 309 │ │ │
│ ❱ 310 │ │ control_verified = _verify_id(id, name, ui_state.cont │
│ 311 │ │ │
│ 312 │ │ action = ActionCommandInfo( │
│ 313 │ │ │ function="click_input", │
│ │
│ C:\Users\skadmin\UFO\ufo\client\mcp\local_servers\ui_mcp_server.py: │
│ 182 in _verify_id │
│ │
│ 179 │ control = control_dict.get(id) │
│ 180 │ │
│ 181 │ if not control: │
│ ❱ 182 │ │ raise ToolError( │
│ 183 │ │ │ f"Control with id '{id}' not found. Available con │
│ {list(control_dict.keys())}" │
│ 184 │ │ ) │
│ 185 │
╰─────────────────────────────────────────────────────────────────────╯
ToolError: Control with id '4' not found. Available control ids: ['1',
'2', '3']

[JiwaniZakir]

The traceback points to argument validation failure in fastmcp's tool.py:295 — the type_adapter is rejecting the arguments being passed to click_input, which typically means the agent is constructing the tool call with incorrect parameter names, wrong types, or missing required fields that don't match the tool's registered signature. This could be caused by a mismatch between the tool schema advertised to the LLM and the actual function signature in the MCP server, causing the model to hallucinate parameter names or structure. Worth checking whether the click_input tool definition in the UFO MCP server has changed recently (renamed params, added required fields, etc.) while the prompt/schema sent to the agent wasn't updated to match.