# Workerd API Review

> Performance optimization, API design & compatibility, security vulnerabilities, and standards spec compliance for workerd code review. Covers tcmalloc-aware perf analysis, compat flags, autogates, web standards adherence, and security patterns. Load this skill when reviewing API changes, performance-sensitive code, security-relevant code, or standards implementations.

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

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**Always** use the `docs/reference/api-review-checklist.md` file for detailed checklists on performance optimization, API design, security vulnerabilities, and standards compliance when planning, writing, or reviewing code changes.