agents-sdk
Build, debug, or review Cloudflare Agents SDK applications using the agents package.
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Install
Works with every agent the skills CLI supports.
npx skills add https://developers.cloudflare.com --skill agents-sdk- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads agents-sdk automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Cloudflare Agents SDK
Your knowledge of the Agents SDK may be outdated. Prefer retrieval over pre-training for any Agents SDK task.
Retrieval Sources
Cloudflare docs: https://developers.cloudflare.com/agents/index.md
| Topic | Docs URL | Use for |
|---|---|---|
| Getting started | Quick start | First agent, project setup |
| Adding to existing project | Add to existing project | Install into existing Workers app |
| Configuration | Configuration | wrangler.jsonc, bindings, assets, deployment |
| Agent class | Agents API | Agent lifecycle, patterns, pitfalls |
| State | Store and sync state | setState, validateStateChange, persistence |
| Routing | Routing | URL patterns, routeAgentRequest |
| Callable methods | Callable methods | @callable, RPC, streaming, timeouts |
| Scheduling | Schedule tasks | schedule(), scheduleEvery(), cron |
| Workflows | Run workflows | AgentWorkflow, durable multi-step tasks |
| HTTP/WebSockets | WebSockets | Lifecycle hooks, hibernation |
| Chat agents | Chat agents | AIChatAgent, streaming, tools, persistence |
| Client SDK | Client SDK | useAgent, AgentClient, state, RPC, HTTP |
| Client tools | Client tools | Client-side tools, autoContinueAfterToolResult |
| Server-driven messages | Autonomous responses | saveMessages, waitUntilStable, server-initiated turns |
| Resumable streaming | Chat agents | Stream recovery on disconnect |
| Email routing, secure reply resolver | ||
| MCP client | MCP client | Connecting to MCP servers |
| MCP server | MCP server | Building MCP servers with createMcpHandler |
| MCP transports | MCP transports | Streamable HTTP, SSE, RPC transport options |
| Securing MCP servers | Securing MCP | OAuth, proxy MCP, hardening |
| Human-in-the-loop | Human-in-the-loop | Workflow approvals, elicitation, timeout handling |
| Durable execution | Durable execution | runFiber(), stash(), surviving DO eviction |
| Queue | Queue | Built-in FIFO queue, queue() |
| Retries | Retries | this.retry(), backoff/jitter |
| Observability | Observability | Diagnostics-channel events |
| Push notifications | Push notifications | Web Push + VAPID from agents |
| Webhooks | Webhooks | Receiving external webhooks |
| Cross-domain auth | Cross-domain auth | WebSocket auth, tokens, CORS |
| Readonly connections | Readonly | shouldConnectionBeReadonly |
| Voice | Voice | Experimental STT/TTS, withVoice |
| Browse the web | Browser tools | Experimental CDP browser automation |
| Think | Think | Experimental higher-level chat agent class |
| Migrations | AI SDK v5, AI SDK v6 | Upgrading @cloudflare/ai-chat |
Capabilities
The Agents SDK provides:
- Persistent state — SQLite-backed, auto-synced to clients via
setState - Callable RPC —
@callable()methods invoked over WebSocket - Scheduling — One-time, recurring (
scheduleEvery), and cron tasks - Workflows — Durable multi-step background processing via
AgentWorkflow - Durable execution —
runFiber()/stash()for work that survives DO eviction - Queue — Built-in FIFO queue with retries via
queue() - Retries —
this.retry()with exponential backoff and jitter - MCP integration — Connect to MCP servers or build your own with
createMcpHandler - Email handling — Receive and reply to emails with secure routing
- Streaming chat —
AIChatAgentwith resumable streams, message persistence, tools - Server-driven messages —
saveMessages,waitUntilStablefor proactive agent turns - React hooks —
useAgent,useAgentChatfor client apps - Observability —
diagnostics_channelevents for state, RPC, schedule, lifecycle - Push notifications — Web Push + VAPID delivery from agents
- Webhooks — Receive and verify external webhooks
- Voice (experimental) — STT/TTS via
@cloudflare/voice - Browser tools (experimental) — CDP-powered browsing via
agents/browser - Think (experimental) — Higher-level chat agent via
@cloudflare/think
FIRST: Verify Installation
npm ls agents # Should show agents package
If not installed:
npm install agents
For chat agents:
npm install agents @cloudflare/ai-chat ai @ai-sdk/react
Wrangler Configuration
{
"compatibility_flags": ["nodejs_compat"],
"durable_objects": {
"bindings": [{ "name": "MyAgent", "class_name": "MyAgent" }]
},
"migrations": [{ "tag": "v1", "new_sqlite_classes": ["MyAgent"] }]
}
Gotchas:
- Do NOT enable
experimentalDecoratorsin tsconfig (breaks@callable) - Never edit old migrations — always add new tags
- Each agent class needs its own DO binding + migration entry
- Add
"ai": { "binding": "AI" }for Workers AI
Agent Class
import { Agent, routeAgentRequest, callable } from "agents";
type State = { count: number };
export class Counter extends Agent<Env, State> {
initialState = { count: 0 };
validateStateChange(nextState: State, source: Connection | "server") {
if (nextState.count < 0) throw new Error("Count cannot be negative");
}
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" })
Custom routing: use getAgentByName(env.MyAgent, "instance-id") then agent.fetch(request).
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) |
| Durable fiber | await this.runFiber("name", async (ctx) => { ... }) |
| Enqueue work | this.queue("handler", payload) |
| Retry with backoff | await this.retry(fn, { maxAttempts: 5 }) |
| Broadcast to clients | this.broadcast(message) |
| Get connections | this.getConnections(tag?) |
React Client
Read client-sdk.md for client selection and current connection examples. For chat UI and tools, also read streaming-chat.md.
References
Core
- references/state-scheduling.md — State persistence, scheduling, SQL
- references/callable.md — RPC methods, streaming, timeouts
- references/routing.md — URL patterns, custom routing,
getAgentByName - references/configuration.md — Wrangler config, bindings, Vite setup
Chat & Streaming
- references/streaming-chat.md — AIChatAgent, resumable streams, tools
- references/client-sdk.md —
useAgent,useAgentChat,AgentClient - references/server-driven-messages.md — Trigger patterns,
saveMessages - references/human-in-the-loop.md — Approval flows,
needsApproval
Background Processing
- references/workflows.md — Durable Workflows integration
- references/durable-execution.md —
runFiber,stash, surviving eviction - references/queue-retries.md — Built-in queue, retry with backoff
Integrations
- references/mcp.md — MCP client and server, transports, securing
- references/email.md — Email routing and handling
- references/webhooks-push.md — Webhooks, push notifications
- references/observability.md — Diagnostics-channel events
Experimental
- references/think.md —
@cloudflare/thinkhigher-level chat agent - references/voice.md —
@cloudflare/voiceSTT/TTS - references/codemode.md — Code Mode for tool orchestration
- references/browse-the-web.md — CDP browser tools
FAQ
What does the agents-sdk skill do?
Build, debug, or review Cloudflare Agents SDK applications using the agents package.
How do I install agents-sdk?
Run npx skills add https://developers.cloudflare.com --skill agents-sdk in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/agents-sdk/ (personal) or .claude/skills/agents-sdk/ (project).
Which AI agents can use agents-sdk?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is agents-sdk safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains agents-sdk?
It is published by developers.cloudflare.com in developers.cloudflare.com. It has 443 recorded installs.
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