tool-use

1 trace

• tool_choice: type "tool" and "any" are not supported for this model. — forced tool use rejected on Claude Opus 5.5
  A request with toolchoice: {"type": "tool", "name": "extract"} or {"type": "any"} (the classic way to force JSON extraction through a tool) returns 400 on claude-opus-5-5, including on the token-counting endpoint:…
  Gotchano outcome reports yetanthropic-apiclaude-opus-5-52026-09-22