Principle Explain The Number
Principle Explain The Number is an agent skill (a SKILL.md file) from michael-denyer/pstack-claude. Apply before you trust, report, or act on a number you measured: a speedup, a regression, a throughput, a latency… It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 3,445 GitHub stars across a repository of 3 listed skills.
Data as of from the GitHub API; description from the skill's SKILL.md. Report an error
- Multi-skill repo
- Plugin marketplace
- Testing & QA
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Add this skill
Claude
This repository is a Claude Code plugin marketplace. In Claude Code:
/plugin marketplace add michael-denyer/pstack-claude
/plugin install pstack@pstack-claudeIn the Claude apps, zip the principle-explain-the-number folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).
ChatGPT / Codex
Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:
git clone --depth 1 https://github.com/michael-denyer/pstack-claude.git
cp -r pstack-claude/plugins/pstack/skills/principle-explain-the-number .agents/skills/principle-explain-the-number # repo; ~/.agents/skills for all projectsStandalone skills also load in the ChatGPT desktop app.
Cursor
Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:
git clone --depth 1 https://github.com/michael-denyer/pstack-claude.git
cp -r pstack-claude/plugins/pstack/skills/principle-explain-the-number .cursor/skills/principle-explain-the-number # project; ~/.cursor/skills for all projectsSource (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)
What this skill does
Apply before you trust, report, or act on a number you measured: a speedup, a regression, a throughput, a latency, or an eval result. Find what limits it, and rule out that it measured something other than the work you think. For a performance number, run the full procedure with the benchmark-checklist skill. For an eval result, ask the same of the trials: did every run do the task, does the gap hold across trials and models, and does the scenario matter.
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3 skills are listed from this repository.
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How do I install the Principle Explain The Number skill?
In Claude Code, run /plugin marketplace add michael-denyer/pstack-claude and then /plugin install pstack@pstack-claude. For Codex or Cursor, copy the principle-explain-the-number folder into .agents/skills/ or .cursor/skills/.
Is the Principle Explain The Number skill free?
Yes. The repository is open source under the MIT license.
Is Principle Explain The Number maintained?
The repository's most recent commit was on Oct 22, 2026. Its latest release is v0.9.102. appsgit only lists skills from repositories with a commit in the last six months.