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regression-check

92 / 100 · Low risk

Fine to try.

By petrbouda/jeffrey (GitHub) · other · 81 stars · scanned at commit b7fcdb7

Decides whether a change made this project slower, by profiling two revisions the same way and weighing them against each other — build and record each, import both into a running Jeffrey Microscope, then report what moved and by how much. Use when the user asks whether a commit, branch or pull request regressed performance, wants a before-and-after measured rather than argued, or suspects a slowdown appeared somewhere in a range of commits.

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/'regression-check' ] || [ -L ~/.agents/skills/'regression-check' ]; then echo 'A skill folder named regression-check already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/petrbouda/jeffrey' "$d" && git -C "$d" checkout --quiet 'b7fcdb7b36f8f188c3d9642fd8aabc46dc882b20' -- 'jeffrey-agent-plugin/skills/regression-check' && mkdir -p ~/.agents/skills && cp -R "$d"/'jeffrey-agent-plugin/skills/regression-check' ~/.agents/skills/'regression-check' && 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/'regression-check' ~/.claude/skills/'regression-check' (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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