/claude-api prompt-audit: skill audit for Fable 5.1
Skills for older models misfire on Fable 5.1: duplicate rules, dead commands and old model names listed, with a diff.
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/plugin marketplace add anthropics/skills/claude-api prompt-auditNext In Claude Code, run Step 1, install claude-api from /plugin, then run Step 3.
If you just switched Claude Code to Fable 5.1, run this on your skills first. Across a whole workspace it found duplicate constraints, dead slash commands, old hard-coded model names and output scaffolding written for older models.
One of the clearest fixes: “CRITICAL: You MUST use this tool when…” became “Use this tool when…”. Fable 5.1 follows instructions more literally. Extra emphasis that kept older models on task can now trigger repeated checks and unnecessary tool calls.
The command only generates an audit report and a proposed diff. It does not edit any files. Each finding includes its location, explanation and confidence level, and you decide which changes to apply.
The official skill is free and open source: https://github.com/anthropics/skills/tree/main/skills/claude-api
How to use:
- In Claude Code, add the marketplace.
- Open
/plugin, find anthropic-agent-skills and install claude-api. - Run the audit.
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