Verification Before Completion Skill

Overview

Enforce rigorous, adversarial verification before declaring any task complete. Implements defense-in-depth validation with multiple independent checks to catch errors before they reach users. The core principle: verify independently rather than trusting executor claims (what was SAID) — verify what ACTUALLY exists in the codebase through testing, inspection, and data-flow tracing.

This skill prevents the most common form of premature completion: claiming success without running tests, summarizing results instead of showing evidence, or trusting code that "looks right" without verification.

Instructions

Step 1: Identify What Changed

Before verification, understand the scope of changes:

# For git repositories
git diff --name-only