* Fix auto function calling stripping explicit null arguments (fixes#5934)
* fix: re-role trailing assistant message to user for Anthropic (fixes#5008)
* fix: address Copilot review feedback (exclude_unset, test coverage, synthetic user turn)
* fix: update docstring and extend exclude_unset to auto_invoke_function
* revert: remove unrelated core _tools.py changes from Anthropic PR
The exclude_none/exclude_unset changes in the core package are out of scope
for this Anthropic-specific fix. This PR now only contains the Anthropic
chat client docstring fix and the synthetic user turn append.
* fix: avoid appending user turn after Anthropic tool use
* Fix Anthropic tool-use type narrowing
Use object-typed content narrowing before checking Anthropic tool-use block types so strict Pyright no longer treats dynamic message content as Unknown.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Co-authored-by: Evan Mattson <evan.mattson@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
hanhan761
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