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89 lines
2.7 KiB
Markdown
89 lines
2.7 KiB
Markdown
# Cloudflare Agents SDK
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Cloudflare Agents SDK enables building AI-powered agents on Durable Objects with state, WebSockets, SQL, scheduling, and AI integration.
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## Core Value
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Build stateful, globally distributed AI agents with persistent memory, real-time connections, scheduled tasks, and async workflows.
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## When to Use
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- Persistent state + memory required
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- Real-time WebSocket connections
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- Long-running workflows (minutes/hours)
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- Chat interfaces with AI models
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- Scheduled/recurring tasks with state
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- DB queries with agent state
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## What Type of Agent?
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| Use Case | Class | Key Features |
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|----------|-------|--------------|
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| AI chat interface | `AIChatAgent` | Auto-streaming, tools, message history, resumable |
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| MCP tool provider | `Agent` + MCP | Expose tools to AI systems |
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| Custom logic/routing | `Agent` | Full control, WebSockets, email, SQL |
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| Real-time collaboration | `Agent` | WebSocket state, broadcasts |
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| Email processing | `Agent` | `onEmail()` handler |
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## Quick Start
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**AI Chat Agent:**
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```typescript
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import { AIChatAgent } from "agents";
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import { openai } from "@ai-sdk/openai";
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export class ChatAgent extends AIChatAgent<Env> {
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async onChatMessage(onFinish) {
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return this.streamText({
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model: openai("gpt-4"),
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messages: this.messages,
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onFinish,
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});
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}
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}
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```
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**Base Agent:**
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```typescript
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import { Agent } from "agents";
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export class MyAgent extends Agent<Env> {
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onStart() {
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this.sql`CREATE TABLE IF NOT EXISTS users (id TEXT PRIMARY KEY)`;
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}
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async onRequest(request: Request) {
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return Response.json({ state: this.state });
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}
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}
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```
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## Reading Order
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| Task | Files to Read |
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|------|---------------|
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| Quick start | README only |
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| Build chat agent | README → api.md (AIChatAgent) → patterns.md |
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| Setup project | README → configuration.md |
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| Add React frontend | README → api.md (Client Hooks) → patterns.md |
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| Build MCP server | api.md (MCP) → patterns.md |
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| Background tasks | api.md (Scheduling, Task Queue) → patterns.md |
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| Debug issues | gotchas.md |
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## Package Entry Points
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| Import | Purpose |
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|--------|---------|
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| `agents` | Server-side Agent classes, lifecycle |
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| `agents/react` | `useAgent()` hook for WebSocket connections |
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| `agents/ai-react` | `useAgentChat()` hook for AI chat UIs |
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## In This Reference
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- [configuration.md](./configuration.md) - SDK setup, wrangler config, routing
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- [api.md](./api.md) - Agent classes, lifecycle, client hooks
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- [patterns.md](./patterns.md) - Common workflows, best practices
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- [gotchas.md](./gotchas.md) - Common issues, limits
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## See Also
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- durable-objects - Agent infrastructure
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- d1 - External database integration
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- workers-ai - AI model integration
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- vectorize - Vector search for RAG patterns |