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compare-jfr

94 / 100 · Low risk

Fine to try.

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

Compares two JVM profiles held by a running Jeffrey Microscope — a before and an after — using differential flamegraphs, to answer whether a change made the application slower, faster, or allocate more. Use whenever the user asks if a change regressed performance, what got slower or faster between two runs, to compare two recordings, benchmarks or branches, or mentions a baseline, a before/after or a performance regression. For a single profile, analyze-jfr applies instead; for a heap dump, ana…

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/'compare-jfr' ] || [ -L ~/.agents/skills/'compare-jfr' ]; then echo 'A skill folder named compare-jfr 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 "$d" checkout --quiet 'b7fcdb7b36f8f188c3d9642fd8aabc46dc882b20' -- 'jeffrey-agent-plugin/skills/compare-jfr' && mkdir -p ~/.agents/skills && cp -R "$d"/'jeffrey-agent-plugin/skills/compare-jfr' ~/.agents/skills/'compare-jfr' && 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/'compare-jfr' ~/.claude/skills/'compare-jfr' (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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