agents-sdk

от openai

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Cloudflare Agents SDK

Your knowledge of the Agents SDK may be outdated. Prefer retrieval over pre-training for any Agents SDK task.

Retrieval Sources

Fetch current docs from https://github.com/cloudflare/agents/tree/main/docs before implementing.

Topic	Doc	Use for
Getting started	`docs/getting-started.md`	First agent, project setup
State	`docs/state.md`	`setState`, `validateStateChange`, persistence
Routing	`docs/routing.md`	URL patterns, `routeAgentRequest`, `basePath`
Callable methods	`docs/callable-methods.md`	`@callable`, RPC, streaming, timeouts
Scheduling	`docs/scheduling.md`	`schedule()`, `scheduleEvery()`, cron
Workflows	`docs/workflows.md`	`AgentWorkflow`, durable multi-step tasks
HTTP/WebSockets	`docs/http-websockets.md`	Lifecycle hooks, hibernation
Email	`docs/email.md`	Email routing, secure reply resolver
MCP client	`docs/mcp-client.md`	Connecting to MCP servers
MCP server	`docs/mcp-servers.md`	Building MCP servers with `McpAgent`
Client SDK	`docs/client-sdk.md`	`useAgent`, `useAgentChat`, React hooks
Human-in-the-loop	`docs/human-in-the-loop.md`	Approval flows, pausing workflows
Resumable streaming	`docs/resumable-streaming.md`	Stream recovery on disconnect

Cloudflare docs: https://developers.cloudflare.com/agents/

Capabilities

The Agents SDK provides:

Persistent state - SQLite-backed, auto-synced to clients
Callable RPC - @callable() methods invoked over WebSocket
Scheduling - One-time, recurring (scheduleEvery), and cron tasks
Workflows - Durable multi-step background processing via AgentWorkflow
MCP integration - Connect to MCP servers or build your own with McpAgent
Email handling - Receive and reply to emails with secure routing
Streaming chat - AIChatAgent with resumable streams
React hooks - useAgent, useAgentChat for client apps

FIRST: Verify Installation

npm ls agents  # Should show agents package

If not installed:

npm install agents

Wrangler Configuration

{
  "durable_objects": {
    "bindings": [{ "name": "MyAgent", "class_name": "MyAgent" }]
  },
  "migrations": [{ "tag": "v1", "new_sqlite_classes": ["MyAgent"] }]
}

Agent Class

import { Agent, routeAgentRequest, callable } from "agents";

type State = { count: number };

export class Counter extends Agent<Env, State> {
  initialState = { count: 0 };

  // Validation hook - runs before state persists (sync, throwing rejects the update)
  validateStateChange(nextState: State, source: Connection | "server") {
    if (nextState.count < 0) throw new Error("Count cannot be negative");
  }

  // Notification hook - runs after state persists (async, non-blocking)
  onStateUpdate(state: State, source: Connection | "server") {
    console.log("State updated:", state);
  }

  @callable()
  increment() {
    this.setState({ count: this.state.count + 1 });
    return this.state.count;
  }
}

export default {
  fetch: (req, env) => routeAgentRequest(req, env) ?? new Response("Not found", { status: 404 })
};

Routing

Requests route to /agents/{agent-name}/{instance-name}:

Class	URL
`Counter`	`/agents/counter/user-123`
`ChatRoom`	`/agents/chat-room/lobby`

Client: useAgent({ agent: "Counter", name: "user-123" })

Core APIs

Task	API
Read state	`this.state.count`
Write state	`this.setState({ count: 1 })`
SQL query	this.sql`SELECT * FROM users WHERE id = ${id}`
Schedule (delay)	`await this.schedule(60, "task", payload)`
Schedule (cron)	`await this.schedule("0 * * * *", "task", payload)`
Schedule (interval)	`await this.scheduleEvery(30, "poll")`
RPC method	`@callable() myMethod() { ... }`
Streaming RPC	`@callable({ streaming: true }) stream(res) { ... }`
Start workflow	`await this.runWorkflow("ProcessingWorkflow", params)`

React Client

import { useAgent } from "agents/react";

function App() {
  const [state, setLocalState] = useState({ count: 0 });

  const agent = useAgent({
    agent: "Counter",
    name: "my-instance",
    onStateUpdate: (newState) => setLocalState(newState),
    onIdentity: (name, agentType) => console.log(`Connected to ${name}`)
  });

  return (
    <button onClick={() => agent.setState({ count: state.count + 1 })}>
      Count: {state.count}
    </button>
  );
}