# Principle Explain The Number (agent skill)

> 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.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/michael-denyer/pstack-claude |
| Skill path | plugins/pstack/skills/principle-explain-the-number/SKILL.md |
| Skill name | principle-explain-the-number |
| GitHub stars | 3,445 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 3 |
| Plugin marketplace | pstack-claude |
| Official | no |
| Works with | Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode |
| Category | Testing & QA |
| Last commit | Oct 22, 2026 |

## Add this skill

### Claude Code

```sh
/plugin marketplace add michael-denyer/pstack-claude
/plugin install pstack@pstack-claude
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
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 projects
```

### Cursor

```sh
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 projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

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Canonical page: https://appsgit.com/skills/michael-denyer-principle-explain-the-number
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