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Run 9's research seal was refused for writing "F1" as a finding id. The rule is real and the message was precise, but no brief had ever stated it: the shape block shows keys and types, and a format constraint is neither. The agent recovered in fifteen seconds, so this cost one boundary rather than a run. It is still a refusal nobody had to earn, and the same shape hid F38 a few runs ago. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CVbaKucEYBjMqVeUgJUsc1