Verification Before Completion
A guardrail against premature success claims. Before saying something is complete, fixed, or passing — and before committing or opening a PR — it requires you to actually run the verification command and read the result. No 'should work,' no assuming green. The rule is evidence first, claim second. Third-party skill from Jesse Vincent's Superpowers collection.
Third-party, by Jesse Vincent
June 8, 2026
Simple install — no setup required
Open the Claude desktop app and go to the Project you want this in
Go to Code, then Customize, then click Create a new skill and upload the skill file below
Say a trigger phrase to activate it
Download the skill file below
In ChatGPT, create a Project and attach the file (or paste its contents into the project instructions). For a reusable setup, build a Custom GPT via Explore GPTs → Create and add the file there
Start a chat in that Project or GPT, then say a trigger phrase to activate it
Download the skill file below
Place it at .cursor/skills/verification-before-completion/SKILL.md (rename the downloaded file to SKILL.md). The shared .agents/skills/verification-before-completion/SKILL.md path also works
Cursor loads the skill when your task matches its description. Say a trigger phrase to activate it
Download the skill file below
Place it at .github/skills/verification-before-completion/SKILL.md in your repository (rename the downloaded file to SKILL.md)
Copilot loads the skill when it is relevant to your task. Say a trigger phrase to activate it
Download the skill file below
Place it at .agents/skills/verification-before-completion/SKILL.md in your repository (rename the downloaded file to SKILL.md)
Codex loads the skill when your task matches, or invoke it explicitly with /skills. Say a trigger phrase to activate it
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What this skill does
This is an overview of the skill from the site, not the skill's real instructions. The full SKILL.md Claude reads when this skill is active lives on GitHub at the source below.
The full SKILL.md for this third-party skill lives on GitHub. Open it to read the exact instructions Claude will follow.