workers-best-practices

SKILL.md

Cloudflare Workers code review and authoring against production best practices.

Retrieves latest Workers APIs, types, and wrangler configuration schema before reviewing or writing code; biases towards live documentation over pre-trained knowledge

Covers 40+ best practice rules across configuration, request/response handling, architecture, observability, code patterns, and security

Flags 15+ common anti-patterns including unbounded streaming, floating promises, global request state, hardcoded secrets, and unsafe crypto usage

Provides structured review workflow: retrieve references, validate types and config, check patterns and security, validate with tools

Your knowledge of Cloudflare Workers APIs, types, and configuration may be outdated. Prefer retrieval over pre-training for any Workers code task — writing or reviewing.

Retrieval Sources

Fetch the latest versions before writing or reviewing Workers code. Do not rely on baked-in knowledge for API signatures, config fields, or binding shapes.

Source
How to retrieve
Use for

Workers best practices
Fetch https://developers.cloudflare.com/workers/best-practices/workers-best-practices/
Canonical rules, patterns, anti-patterns

Workers types
See references/review.md for retrieval steps
API signatures, handler types, binding types

Wrangler config schema
node_modules/wrangler/config-schema.json
Config fields, binding shapes, allowed values

Cloudflare docs
Search tool or https://developers.cloudflare.com/workers/
API reference, compatibility dates/flags

FIRST: Fetch Latest References

Before reviewing or writing Workers code, retrieve the current best practices page and relevant type definitions. If the project's node_modules has an older version, prefer the latest published version.