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prompt-regression

95 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By chrono-meta/forge-harness (GitHub) · coding · 33 stars · scanned at commit f87f196

Statically checks harness assets against a known-answer probe set after rule/skill changes — inspects the changed source for the trigger phrases, chain links and gate conditions each probe expects, and reports PASS/FAIL/SKIP per probe. Source inspection only; it does not run live sessions, so it catches assets that no longer SAY the right thing, not models that stop DOING it. Triggers on "prompt regression", "did my changes break anything", "regression check", "test harness changes".

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'prompt-regression' ] || [ -L ~/.agents/skills/'prompt-regression' ]; then echo 'A skill folder named prompt-regression already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/chrono-meta/forge-harness' "$d" && git -C "$d" checkout --quiet 'f87f196702244aa4114c090e71449dbc7695caeb' -- 'plugins/fh-meta/skills/prompt-regression' && mkdir -p ~/.agents/skills && cp -R "$d"/'plugins/fh-meta/skills/prompt-regression' ~/.agents/skills/'prompt-regression' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'prompt-regression' ~/.claude/skills/'prompt-regression' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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