Cloudflare has one of the most generous free plans I've seen for building websites in the last 10 years, and it is still true now that they are shifting focus to AI agents. With the free tier, you already get enough for personal projects and medium-scale workloads.

Start with agents.cloudflare.com. It already lists almost everything you need.

Cloudflare's agents SDK is a good one, alongside the AI SDK.

Each agent runs as a TypeScript class on a Durable Object, with its own SQL database, WebSocket connections, scheduling, state, and lifecycle.

The stack is simple: run agent logic on Workers, keep state in Durable Objects, call models with Workers AI or AI Gateway, retrieve knowledge from AI Search or Vectorize, and let agents act through Browser Run, MCP, Queues, Workflows, Email, Dynamic Workers, and Sandboxes.

An agent is just a class. You extend Agent, keep state with setState, and route requests to it:

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

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

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

export default {
  async fetch(request, env) {
    return (await routeAgentRequest(request, env)) ?? new Response("Not found", { status: 404 });
  },
} satisfies ExportedHandler<Env>;

The starter for the Agents SDK also includes streaming chat, tools, human-in-the-loop approval, scheduling, and Workers AI by default. Scaffold it with npm create cloudflare@latest -- --template cloudflare/agents-starter (cloudflare/agents-starter).

This is the free/pricing snapshot they offer today:

#My default stack

For a simple agent, I would start with:

Workers + Agents SDK + Durable Objects + Workers AI + AI Gateway + AI Search

Then add:

Browser Run for web browsing, Queues and Workflows for background jobs, R2 for files, Email Service for email agents, and Sandboxes or Dynamic Workers for coding agents.

#Flue, if you want a harness

The Agents SDK gives you the runtime. Flue, an open agent framework from the team behind Astro — which Cloudflare acquired in January 2026 — gives you the harness on top: sessions, tools, skills, and a secure sandbox. It's powered by the Pi harness and runs multi-cloud (write once, deploy anywhere, any LLM), but Cloudflare is the target it maps onto most cleanly. The idea is that you describe what an agent knows instead of scripting what it does:

import { createAgent } from "@flue/runtime";

export default createAgent(() => ({
  model: "anthropic/claude-sonnet-4-6",
  instructions: "Tell a funny hello-world engineering joke.",
}));

npm install @flue/runtime
npx flue init --target cloudflare

When you target Cloudflare, each Flue agent becomes its own Durable Object — isolated storage, isolated compute, scales to as many agents as you spin up, costs nothing idle. Write once, run on whatever model you choose, deploy without lab lock-in.

Example code: withastro/flue · Cloudflare's launch post.