# Principle Prove It Works

> Before declaring completion, exercise the real artifact and observable path with a deterministic check that would fail if the claim were false.

- Skill: `njs14/principle-prove-it-works` (Agent Skill)
- Install (CLI): `npx skillmds@latest add njs14/principle-prove-it-works`
- Raw SKILL.md: https://api.skillmd.com/api/skills/njs14/principle-prove-it-works/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: njs14 (https://skillmd.com/u/njs14)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/njs14/principle-prove-it-works

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# Prove the result

Treat the request text that activated this skill as the completion claim to verify.

Apply [prove it works](../pkstack-principles/references/catalog.md#prove-it-works). Identify an observation
that would fail if the claim were false, exercise the real user or integration path, and inspect
outputs plus side effects. Prefer a rerunnable check. Mark anything short of direct proof as
inconclusive. Return the exact command, result, and evidence boundary.