Add the tool_choice sensitivity escape hatch and the Claude thinking note - #138
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…note Under the canonical forced tool_choice, Anthropic's thinking-by-default models produce no thinking blocks — verified with a three-way probe on Claude Opus 5 (forced tool: none; tool_choice auto: thinking engages and the tool still gets called; forced + explicit adaptive: none) — while every other reasoning-by-default provider reasons regardless of tool forcing. POLICYBENCH_TOOL_CHOICE=auto lets sensitivity runs un-force the tool without touching the canonical condition; the default is unchanged and both directions are test-locked. sensitivity/claude-thinking-2026-08.md documents the finding and the full sensitivity run: Claude Opus 5 at tool_choice auto scores 85.6 weighted exact versus 79.8 on the board (would rank third), on 3.25x the completion tokens and 51s median per household, still parsing 1,984/1,984. The run's predictions are attached to the dashboard-data-20260805 release. The leaderboard itself is unchanged. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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