[MOHAMMED WASIM KHAN (wasim-builds)]

Fixes #8319

Summary

In FunctionTool.run(), arguments extracted from the validated args model were previously all passed as keywords via **kwargs. When a tool function defines positional-only parameters (/), Python raises TypeError: <func>() got some positional-only arguments passed as keyword arguments. Similarly, if cancellation_token was declared as a positional-only parameter, passing it as a keyword argument caused a TypeError.

This PR:

1. Inspects parameter kind in self._signature.parameters.
2. Gathers positional-only arguments (including positional-only cancellation tokens) into pos_args and remaining parameters into kwargs.
3. Calls self._func(*pos_args, **kwargs) across both synchronous (via executor/partial) and asynchronous executions.
4. Adds unit tests covering synchronous and asynchronous functions with positional-only parameters and positional-only cancellation tokens.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.