# Workerd Safety Review

> Memory safety, thread safety, concurrency, and critical detection patterns for workerd code review. Covers V8/KJ boundary hazards, lifetime management, cross-thread safety, and coroutine pitfalls. Load this skill when reviewing any C++ code.

- Skill: `cloudflare/workerd-safety-review` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cloudflare/workerd-safety-review`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cloudflare/workerd-safety-review/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: Cloudflare (https://skillmd.com/u/cloudflare)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/cloudflare/workerd-safety-review

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**Always** use the `docs/reference/cpp-safety-review-checklist.md` file for detailed checklists on memory safety, thread safety, and concurrency correctness when planning, writing, or reviewing code changes.