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create-formal-verification-skill

100 / 100 · Low risk

Fine to try.

By backnotprop/pstack (GitHub) · coding · 4,166 stars · scanned at commit 9cd6939

Generate a project-local skill that formally verifies the code where a bug costs the most and tests reach the least, in any language, with whichever verification tool fits. Use for /create-formal-verification-skill, "model-check this race", "prove this invariant", or when concurrency, retries, state machines, parsers, or unsafe code need more than tests.

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/'create-formal-verification-skill' ] || [ -L ~/.agents/skills/'create-formal-verification-skill' ]; then echo 'A skill folder named create-formal-verification-skill already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/backnotprop/pstack' "$d" && git -C "$d" checkout --quiet '9cd6939b766cb920f1c44970d7c7ee1ec28bd0d6' -- 'skills/create-formal-verification-skill' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/create-formal-verification-skill' ~/.agents/skills/'create-formal-verification-skill' && 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/'create-formal-verification-skill' ~/.claude/skills/'create-formal-verification-skill' (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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