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ab-equivalence

100 / 100 · Low risk

Fine to try.

By bjcoombs/ai-native-toolkit (GitHub) · coding · 32 stars · scanned at commit f31582e

Compare two versions of an LLM-directed document - an original (teacher) and a candidate (student) - across a transfer set and return a per-case behavioural-equivalence verdict plus an efficiency signal. A transform-agnostic library capability other skills compose to gate a transform on behavioural sameness. TRIGGER when asked to A/B test two versions of a prompt / instruction / skill, to check whether a rewritten or compressed document still behaves the same as the original, to validate behavi…

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

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

if [ -e ~/.agents/skills/'ab-equivalence' ] || [ -L ~/.agents/skills/'ab-equivalence' ]; then echo 'A skill folder named ab-equivalence already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/bjcoombs/ai-native-toolkit' "$d" && git -C "$d" checkout --quiet 'f31582e1c9fe75950a9e522649565b93e3072fe0' -- 'skills/ab-equivalence' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/ab-equivalence' ~/.agents/skills/'ab-equivalence' && 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/'ab-equivalence' ~/.claude/skills/'ab-equivalence' (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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