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Quick Reference
| Task | Read File | Key Constraint |
|---|---|---|
| Building Agent class | agents-sdk.md |
new_sqlite_classes in migrations |
| Agent design patterns | agent-patterns.md |
Use AI SDK with Durable Objects |
| MCP server (stateless) | agents-mcp.md |
Use createMcpHandler (recommended) |
| MCP server (stateful) | agents-mcp.md |
Agent + WorkerTransport + createMcpHandler |
| OAuth / auth patterns | auth-deployment.md |
OAUTH_KV binding required for workers-oauth-provider |
| Vector search | vectorize.md |
topK ≤20 with metadata, ≤100 without |
| Durable execution | workflows.md |
Always await step.do(), steps must be idempotent |
| R2, KV, D1 bindings | workers-platform.md |
Use bindings (not REST APIs), D1 prepared statements |
| Logging & tracing | observability.md |
observability: { enabled: true } in wrangler.jsonc |
| CI/CD & deployment | auth-deployment.md |
Workers Builds, GitHub Actions, secrets management |
Critical Standards (Always Apply)
// wrangler.jsonc - REQUIRED settings
{
"compatibility_date": "2025-03-07", // Minimum for Agents
"compatibility_flags": ["nodejs_compat"],
"observability": { "enabled": true }
}
Reranker: MUST Use Batch API
// ✅ CORRECT
await env.AI.run("@cf/baai/bge-reranker-base", {
query: "search query",
contexts: [{ text: "passage1" }, { text: "passage2" }],
top_k: 10
});
// ❌ WRONG - deprecated per-document format
await env.AI.run("@cf/baai/bge-reranker-base", {
text: ["query", "passage"]
});
D1: MUST Use Prepared Statements
// ✅ CORRECT
env.DB.prepare("SELECT * FROM users WHERE id = ?").bind(userId)
// ❌ WRONG - SQL injection risk
env.DB.prepare(`SELECT * FROM users WHERE id = '${userId}'`)
KV: Eventually Consistent
// ✅ CORRECT - return what you wrote
await env.MY_KV.put("key", newValue);
return Response.json({ value: newValue });
// ❌ WRONG - may return stale data
await env.MY_KV.put("key", newValue);
const readBack = await env.MY_KV.get("key"); // May be stale!
When to Read Detail Files
Read agents-sdk.md when:
- Creating a new Agent class
- Implementing state management (
this.setState,this.sql) - Adding scheduling (
this.schedule) - Handling WebSocket connections
- Client APIs (AgentClient, useAgent hook)
Read agent-patterns.md when:
- Designing multi-step AI workflows
- Implementing routing/classification
- Building orchestrator-worker systems
- Need evaluator-optimizer loops
Read agents-mcp.md when:
- Building an MCP server (use
createMcpHandler) - Registering tools with schemas
- Adding OAuth authentication to MCP
- Connecting to external MCP servers as a client
Read auth-deployment.md when:
- Adding authentication (workers-oauth-provider, OAuth 2.1)
- Setting up CI/CD (Workers Builds, GitHub Actions, GitLab CI)
- Managing secrets (wrangler secret, .dev.vars)
- Creating deploy buttons
Read vectorize.md when:
- Creating/querying vector indexes
- Implementing semantic search or RAG
- Building two-stage retrieval (vector + rerank)
- Setting up metadata filters
Read workflows.md when:
- Building durable/long-running tasks
- Need automatic retries with backoff
- Implementing human-in-the-loop (waitForEvent)
- Scheduling delayed execution
Read workers-platform.md when:
- Using R2 (object storage), KV (key-value), or D1 (SQL)
- Configuring wrangler.jsonc bindings
- Need binding types reference
- Working with multipart uploads, presigned URLs
Read observability.md when:
- Setting up logging (Workers Logs, wrangler tail)
- Implementing distributed tracing
- Adding custom analytics (Analytics Engine)
- Configuring Logpush or Tail Workers
File Locations
All detail files are in the references/ subdirectory of this skill. Read the relevant file before implementing.
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