Cloudflare Agents SDK

npm ls agents  # Should show agents package

npm install agents

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

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 }),
}

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>
}