Cloudflare Worker Builder
FlaggedBuilds Cloudflare Workers scripts with routing, KV storage, D1 databases, and edge caching patterns using the Workers API.
$ Copy the SKILL.md file to your project's .claude/skills/ directory About This Skill
Cloudflare Worker Builder generates production-ready Workers scripts that take full advantage of Cloudflare's edge computing platform — zero cold starts, global distribution, and the entire Workers ecosystem.
Generated Worker Types
API Worker Full REST API with route matching using the `itty-router` pattern: ```javascript router.get('/api/items/:id', async (request, env) => { const item = await env.DB.prepare('SELECT * FROM items WHERE id = ?').bind(id).first(); return Response.json(item); }); ```
Request Transformer Modify requests and responses in flight — add headers, rewrite URLs, inject content.
Edge Cache Worker Smart caching with `Cache API` and KV fallback: - Serve stale-while-revalidate patterns - Cache by URL + request headers - Bypass cache for authenticated requests
Geo-Routing Worker Route requests to different origins based on `request.cf.country` and `request.cf.region`.
Cloudflare Bindings
- The skill configures all major Workers bindings:
- KV Namespaces — key-value storage for session data, feature flags
- D1 Database — SQLite at the edge with typed query helpers
- R2 Bucket — object storage for uploads and assets
- Queue — Cloudflare Queues for background processing
- Durable Objects — coordination for WebSocket and state machines
Configuration
Generates complete `wrangler.toml` with environments (dev, staging, production), route patterns, and binding declarations.
Use Cases
- Building API gateway Workers with request routing and transformation
- Implementing edge-side rendering and A/B testing with Workers
- Creating geo-aware routing and redirects using Workers
- Building lightweight APIs with D1 SQLite database on the edge
Pros & Cons
Pros
- +Full Cloudflare ecosystem — KV, D1, R2, Queues, Durable Objects
- +Complete wrangler.toml configuration for all environments
- +Zero cold start architecture built in
- +Edge caching patterns with stale-while-revalidate
Cons
- -Workers runtime has restrictions (no Node.js built-ins, CPU time limit) — generated code respects these but complex logic may need adjustment
- -D1 is eventually consistent — generated queries account for this but application logic must too
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