convert_function_to_tool: undocumented parameter named args gets the whole Args section as its description #765

When a function passed as a tool has a parameter named args that the docstring does not document, the generated tool schema uses the raw text of the docstring's Args: section as that parameter's description.

_parse_docstring stores the raw section under the args key of the same dictionary that convert_function_to_tool uses to look up descriptions by parameter name.

Steps to reproduce

from ollama._utils import convert_function_to_tool

def run_command(command: str, args: list) -> str:
  """
  Run a shell command.

  Args:
    command: The executable to run
  """

tool = convert_function_to_tool(run_command)
print(repr(tool.function.parameters.properties['args'].description))

Expected behavior

'', as for any other undocumented parameter.

Actual behavior

'command: The executable to run\n\n'. The model sees another parameter's documentation as the description of args.

The same collision gives a parameter named _ the text of the Returns: section.

Environment

ollama-python main (35d9667), Python 3.9, pydantic 2.13.