The function-calling guide uses two different names for the same parameter

In the function-calling guide, the first example uses tool_choice and the second one, three sections later, uses toolChoice. Only the first works with the Python SDK. Small thing, but it cost me an hour.

Fixed — thank you. The camelCase one was copied from the TypeScript tab.

Aminata finds more doc bugs than the docs team. We should give her a badge.