Unable to use tool calling with ollama api

[ziouf]

I've configured the Ollama integration in my Home Assistant to use Lemonade Local as the inference provider.
But it seems that Lemonade's implementation of the Ollama API does not support tool calls.

Home Assistant show this error in logs :

Unexpected error during intent recognition
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/assist_pipeline/pipeline.py", line 1298, in recognize_intent
    conversation_result = await conversation.async_converse(
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<9 lines>...
    )
    ^
  File "/usr/src/homeassistant/homeassistant/components/conversation/agent_manager.py", line 129, in async_converse
    result = await method(conversation_input)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/conversation/entity.py", line 55, in internal_async_process
    return await self.async_process(user_input)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/conversation/entity.py", line 68, in async_process
    return await self._async_handle_message(user_input, chat_log)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/ollama/conversation.py", line 84, in _async_handle_message
    await self._async_handle_chat_log(chat_log)
  File "/usr/src/homeassistant/homeassistant/components/ollama/entity.py", line 259, in _async_handle_chat_log
    [
    ...<4 lines>...
    ]
  File "/usr/src/homeassistant/homeassistant/components/conversation/chat_log.py", line 507, in async_add_delta_content_stream
    async for delta in stream:
    ...<91 lines>...
            )
  File "/usr/src/homeassistant/homeassistant/components/ollama/entity.py", line 155, in _transform_stream
    async for response in result:
    ...<20 lines>...
        yield chunk
  File "/usr/local/lib/python3.14/site-packages/ollama/_client.py", line 688, in inner
    yield cls(**part)
          ~~~^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/pydantic/main.py", line 250, in __init__
    validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self)
pydantic_core._pydantic_core.ValidationError: 1 validation error for ChatResponse
message.tool_calls.0.function.arguments
  Input should be a valid dictionary [type=dict_type, input_value='{', input_type=str]
    For further information visit https://errors.pydantic.dev/2.12/v/dict_type

How to reproduce

• Install Home Assistant
• Setup oLLama integration targeting Lemonade server
• Setup chat agent with assist enabled. This enables tool calling to retrieve sensor values.

• Ask something to the agent

Additional informations

It looks like Home Assistant is not the only integration encountering this issue.

Lene0815 is having an issue with tool caling on OpenClaw

I don't know if it's related

[lenne0815]

I just tested this back to back again via openclaw on lemonade 10.0.1 Via ollama api tool calls fail via local-llama they work just fine with the same model.

[ChrisSoelder]

I have exactly the same issue here on my setup. Is there any workaround for now?

[zztop007]

I would love to use Lemon with Ollama toolcalls, listening in

[Nxtmind]

Interested in this support, am I am having to use the open ai compatible ones instead

[josephsteele]

I also have this problem

[anditherobot]

This appears resolved by PR #1780, which fixed Ollama tool-call conversion and argument handling. Close?

[fl0rianr]

I see this as resolved, you can reopen if it's not the case.