# Principle Prove It Works

> Verify the requested behavior against the real artifact or surface whenever possible; a proxy check only proves the proxy. Use when verifying changes, completing tasks, or claiming something is fixed.

- Skill: `theonlyfusioncube/principle-prove-it-works` (Agent Skill)
- Install (CLI): `npx skillmds@latest add theonlyfusioncube/principle-prove-it-works`
- Raw SKILL.md: https://api.skillmd.com/api/skills/theonlyfusioncube/principle-prove-it-works/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: TheOnlyFusionCube (https://skillmd.com/u/theonlyfusioncube)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/theonlyfusioncube/principle-prove-it-works

---

# Prove It Works

## Trigger

When verifying changes, completing tasks, or claiming something is fixed.

## Rule

Verify the requested behavior against the real artifact or surface whenever possible; a proxy check only proves the proxy.

## Application

1. Name the concrete decision this principle changes.
2. Apply the rule to that decision, not as a decorative citation.
3. Prefer evidence from the current repository/runtime over generic preference.
4. If the principle conflicts with an explicit user constraint, keep the constraint and state the tradeoff.