# Harden

> Re-read a diff for unvalidated input, swallowed errors and missing edge cases

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

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# Harden

Re-read the diff looking only for unvalidated input, swallowed errors, and edge
cases missing from the tests.

Propose nothing else. No style, no renaming.