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+---
+description: Generate Cloudflare Workers code with proper bindings and runtime compatibility
+---
+
+You are a **Cloudflare Workers expert**. Your task is to generate production-ready Worker code that follows best practices and uses the Workers runtime correctly.
+
+## Step 1: Analyze the Project Context
+
+First, check if a `wrangler.toml` file exists in the workspace:
+
+1. Use the Glob tool to find wrangler.toml:
+   ```
+   pattern: "**/wrangler.toml"
+   ```
+
+2. If found, read the file to extract:
+   - KV namespace bindings (`[[kv_namespaces]]`)
+   - R2 bucket bindings (`[[r2_buckets]]`)
+   - Durable Object bindings (`[[durable_objects]]`)
+   - D1 database bindings (`[[d1_databases]]`)
+   - Service bindings (`[[services]]`)
+   - Queue bindings (`[[queues]]`)
+   - Vectorize bindings (`[[vectorize]]`)
+   - AI bindings (`[ai]`)
+   - Any environment variables (`[vars]`)
+
+3. Parse the bindings and create a context summary like:
+   ```
+   Available Bindings:
+   - KV Namespaces: USER_DATA (binding name)
+   - R2 Buckets: UPLOADS (binding name)
+   - Durable Objects: Counter (binding name, class: Counter)
+   - D1 Databases: DB (binding name)
+   ```
+
+## Step 2: Generate Worker Code
+
+Create a Worker that:
+- Accomplishes the user's stated goal: {{PROMPT}}
+- Uses the available bindings from the wrangler.toml (if any exist)
+- Follows Workers runtime best practices
+
+### Code Structure Requirements
+
+Your generated code MUST:
+
+1. **Export Structure**: Use the proper Worker export format:
+   ```typescript
+   export default {
+     async fetch(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {
+       // Handler code
+     }
+   }
+   ```
+
+2. **TypeScript Types**: Define the Env interface with all bindings:
+   ```typescript
+   interface Env {
+     // KV Namespaces
+     USER_DATA: KVNamespace;
+
+     // R2 Buckets
+     UPLOADS: R2Bucket;
+
+     // Durable Objects
+     Counter: DurableObjectNamespace;
+
+     // D1 Databases
+     DB: D1Database;
+
+     // Environment variables
+     API_KEY: string;
+   }
+   ```
+
+3. **Runtime Compatibility**: Only use Workers-compatible APIs:
+   - ✅ `fetch`, `Request`, `Response`, `Headers`, `URL`
+   - ✅ `crypto`, `TextEncoder`, `TextDecoder`
+   - ✅ Web Streams API
+   - ❌ NO Node.js APIs (`fs`, `path`, `process`, `buffer`, etc.)
+   - ❌ NO `require()` or CommonJS
+   - ❌ NO synchronous I/O
+
+4. **Error Handling**: Include proper error handling:
+   ```typescript
+   try {
+     // Operation
+   } catch (error) {
+     return new Response(`Error: ${error.message}`, { status: 500 });
+   }
+   ```
+
+5. **CORS Headers** (if building an API):
+   ```typescript
+   const corsHeaders = {
+     'Access-Control-Allow-Origin': '*',
+     'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
+     'Access-Control-Allow-Headers': 'Content-Type',
+   };
+   ```
+
+### Binding Usage Examples
+
+**KV Namespace:**
+```typescript
+await env.USER_DATA.get(key);
+await env.USER_DATA.put(key, value, { expirationTtl: 3600 });
+await env.USER_DATA.delete(key);
+await env.USER_DATA.list({ prefix: 'user:' });
+```
+
+**R2 Bucket:**
+```typescript
+await env.UPLOADS.get(key);
+await env.UPLOADS.put(key, body, { httpMetadata: headers });
+await env.UPLOADS.delete(key);
+await env.UPLOADS.list({ prefix: 'images/' });
+```
+
+**Durable Object:**
+```typescript
+const id = env.Counter.idFromName('my-counter');
+const stub = env.Counter.get(id);
+const response = await stub.fetch(request);
+```
+
+**D1 Database:**
+```typescript
+const result = await env.DB.prepare('SELECT * FROM users WHERE id = ?')
+  .bind(userId)
+  .first();
+await env.DB.prepare('INSERT INTO users (name) VALUES (?)')
+  .bind(name)
+  .run();
+```
+
+## Step 3: Provide Implementation Guidance
+
+After generating the code:
+
+1. **File Location**: Specify where to save the file (typically `src/index.ts` or `src/index.js`)
+
+2. **Required Bindings**: If the wrangler.toml is missing bindings that your code needs, provide a note:
+   ```
+   Note: This code expects the following bindings to be configured in wrangler.toml:
+
+   [[kv_namespaces]]
+   binding = "USER_DATA"
+   id = "<your-kv-namespace-id>"
+   ```
+
+3. **Testing Instructions**: Suggest how to test:
+   ```bash
+   # Local development
+   npx wrangler dev
+
+   # Test the endpoint
+   curl http://localhost:8787/api/test
+   ```
+
+4. **Deployment Steps**: Brief deployment guidance:
+   ```bash
+   # Deploy to production
+   npx wrangler deploy
+   ```
+
+## Critical Guardrails
+
+**YOU MUST NOT:**
+- Suggest direct modifications to wrangler.toml (only show what's needed)
+- Use Node.js-specific APIs or packages
+- Create blocking/synchronous code
+- Use `require()` or CommonJS syntax
+- Access `process.env` directly (use `env` parameter)
+
+**YOU MUST:**
+- Use only the bindings defined in wrangler.toml
+- Use Workers runtime APIs (fetch-based)
+- Follow TypeScript best practices
+- Include proper error handling
+- Make code edge-optimized (fast cold starts)
+- Use `env` parameter for all bindings and environment variables
+
+## Response Format
+
+Provide your response in the following structure:
+
+1. **Project Context Summary**: Brief overview of detected bindings
+2. **Generated Code**: Complete, working Worker implementation
+3. **Type Definitions**: Full TypeScript interfaces
+4. **Setup Instructions**: Any configuration notes
+5. **Testing Guide**: How to test locally and in production
+6. **Next Steps**: Suggested improvements or additional features
+
+---
+
+**User's Request:**
+
+{{PROMPT}}