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The model has been upgraded, but the prompts in the project often still belong to the previous generation. The bold warnings, mandatory steps, and repeated formatting rules written to keep older models from “slacking off” now waste context on Fable 5.1, and can also push a model that already follows instructions farther than it needs to go.
Claude Code already added a dedicated entry point for this: /claude-api prompt-audit. The changelog defines it plainly: audit prompts and tool descriptions, and look for patterns written for older models.
I have been running this command while upgrading projects to Fable 5.1. It inspects CLAUDE.md, skills, and other config, flags instructions the new model no longer needs, and proposes a diff. It works even if the project does not call the Claude API directly.
