Skip to content
Cloudflare Docs

Changelog

New updates and improvements at Cloudflare.

Subscribe to RSS
View all RSS feeds

hero image

  1. Build MCP servers with the Agents SDK

    Agents Workers

    The Agents SDK now includes built-in support for building remote MCP (Model Context Protocol) servers directly as part of your Agent. This allows you to easily create and manage MCP servers, without the need for additional infrastructure or configuration.

    The SDK includes a new MCPAgent class that extends the Agent class and allows you to expose resources and tools over the MCP protocol, as well as authorization and authentication to enable remote MCP servers.

    export class MyMCP extends McpAgent {
      server = new McpServer({
        name: "Demo",
        version: "1.0.0",
      });
    

      async init() {
        this.server.resource(`counter`, `mcp://resource/counter`, (uri) => {
          // ...
        });
    

        this.server.tool(
          "add",
          "Add two numbers together",
          { a: z.number(), b: z.number() },
          async ({ a, b }) => {
            // ...
          },
        );
      }
    }

    See the example ↗ for the full code and as the basis for building your own MCP servers, and the client example ↗ for how to build an Agent that acts as an MCP client.

    To learn more, review the announcement blog ↗ as part of Developer Week 2025.

    Agents SDK updates

    We've made a number of improvements to the Agents SDK, including:

    • Support for building MCP servers with the new MCPAgent class.
    • The ability to export the current agent, request and WebSocket connection context using import { context } from "agents", allowing you to minimize or avoid direct dependency injection when calling tools.
    • Fixed a bug that prevented query parameters from being sent to the Agent server from the useAgent React hook.
    • Automatically converting the agent name in useAgent or useAgentChat to kebab-case to ensure it matches the naming convention expected by routeAgentRequest.

    To install or update the Agents SDK, run npm i agents@latest in an existing project, or explore the agents-starter project:

    Terminal window
    npm create cloudflare@latest -- --template cloudflare/agents-starter

    See the full release notes and changelog on the Agents SDK repository ↗ and

  1. Workflows is now Generally Available

    Workflows Workers

    Workflows is now Generally Available (or "GA"): in short, it's ready for production workloads. Alongside marking Workflows as GA, we've introduced a number of changes during the beta period, including:

    • A new waitForEvent API that allows a Workflow to wait for an event to occur before continuing execution.
    • Increased concurrency: you can run up to 4,500 Workflow instances concurrently — and this will continue to grow.
    • Improved observability, including new CPU time metrics that allow you to better understand which Workflow instances are consuming the most resources and/or contributing to your bill.
    • Support for vitest for testing Workflows locally and in CI/CD pipelines.

    Workflows also supports the new increased CPU limits that apply to Workers, allowing you to run more CPU-intensive tasks (up to 5 minutes of CPU time per instance), not including the time spent waiting on network calls, AI models, or other I/O bound tasks.

    Human-in-the-loop

    The new step.waitForEvent API allows a Workflow instance to wait on events and data, enabling human-in-the-the-loop interactions, such as approving or rejecting a request, directly handling webhooks from other systems, or pushing event data to a Workflow while it's running.

    Because Workflows are just code, you can conditionally execute code based on the result of a waitForEvent call, and/or call waitForEvent multiple times in a single Workflow based on what the Workflow needs.

    For example, if you wanted to implement a human-in-the-loop approval process, you could use waitForEvent to wait for a user to approve or reject a request, and then conditionally execute code based on the result.

    import { Workflow, WorkflowEvent } from "cloudflare:workflows";
    

    export class MyWorkflow extends WorkflowEntrypoint {
      async run(event, step) {
        // Other steps in your Workflow
        let event = await step.waitForEvent(
          "receive invoice paid webhook from Stripe",
          { type: "stripe-webhook", timeout: "1 hour" },
        );
        // Rest of your Workflow
      }
    }

    You can then send a Workflow an event from an external service via HTTP or from within a Worker using the Workers API for Workflows:

    export default {
      async fetch(req, env) {
        const instanceId = new URL(req.url).searchParams.get("instanceId");
        const webhookPayload = await req.json();
    

        let instance = await env.MY_WORKFLOW.get(instanceId);
        // Send our event, with `type` matching the event type defined in
        // our step.waitForEvent call
        await instance.sendEvent({
          type: "stripe-webhook",
          payload: webhookPayload,
        });
    

        return Response.json({
          status: await instance.status(),
        });
      },
    };

    Read the GA announcement blog ↗ to learn more about what landed as part of the Workflows GA.

  1. Create fully-managed RAG pipelines for your AI applications with AutoRAG

    AutoRAG Vectorize

    AutoRAG is now in open beta, making it easy for you to build fully-managed retrieval-augmented generation (RAG) pipelines without managing infrasturcture. Just upload your docs to R2, and AutoRAG handles the rest: embeddings, indexing, retrieval, and response generation via API.

    AutoRAG open beta demo

    With AutoRAG, you can:

    • Customize your pipeline: Choose from Workers AI models, configure chunking strategies, edit system prompts, and more.
    • Instant setup: AutoRAG provisions everything you need from Vectorize, AI gateway, to pipeline logic for you, so you can go from zero to a working RAG pipeline in seconds.
    • Keep your index fresh: AutoRAG continuously syncs your index with your data source to ensure responses stay accurate and up to date.
    • Ask questions: Query your data and receive grounded responses via a Workers binding or API.

    Whether you're building internal tools, AI-powered search, or a support assistant, AutoRAG gets you from idea to deployment in minutes.

    Get started in the Cloudflare dashboard ↗ or check out the guide for instructions on how to build your RAG pipeline today.

  1. Browser Rendering REST API is Generally Available, with new endpoints and a free tier

    Browser Rendering

    We’re excited to announce Browser Rendering is now available on the Workers Free plan ↗, making it even easier to prototype and experiment with web search and headless browser use-cases when building applications on Workers.

    The Browser Rendering REST API is now Generally Available, allowing you to control browser instances from outside of Workers applications. We've added three new endpoints to help automate more browser tasks:

    • Extract structured data – Use /json to retrieve structured data from a webpage.
    • Retrieve links – Use /links to pull all links from a webpage.
    • Convert to Markdown – Use /markdown to convert webpage content into Markdown format.

    For example, to fetch the Markdown representation of a webpage:

    Markdown example
    curl -X 'POST' 'https://api.cloudflare.com/client/v4/accounts/<accountId>/browser-rendering/markdown' \
      -H 'Content-Type: application/json' \
      -H 'Authorization: Bearer <apiToken>' \
      -d '{
        "url": "https://example.com"
      }'

    For the full list of endpoints, check out our REST API documentation. You can also interact with Browser Rendering via the Cloudflare TypeScript SDK ↗.

    We also recently landed support for Playwright in Browser Rendering for browser automation from Cloudflare Workers, in addition to Puppeteer, giving you more flexibility to test across different browser environments.

    Visit the Browser Rendering docs to learn more about how to use headless browsers in your applications.

  1. Durable Objects on Workers Free plan

    Durable Objects Workers

    Durable Objects can now be used with zero commitment on the Workers Free plan allowing you to build AI agents with Agents SDK, collaboration tools, and real-time applications like chat or multiplayer games.

    Durable Objects let you build stateful, serverless applications with millions of tiny coordination instances that run your application code alongside (in the same thread!) your durable storage. Each Durable Object can access its own SQLite database through a Storage API. A Durable Object class is defined in a Worker script encapsulating the Durable Object's behavior when accessed from a Worker. To try the code below, click the button:

    Deploy to Cloudflare

    import { DurableObject } from "cloudflare:workers";
    

    // Durable Object
    export class MyDurableObject extends DurableObject {
      ...
      async sayHello(name) {
        return `Hello, ${name}!`;
      }
    }
    

    // Worker
    export default {
      async fetch(request, env) {
        // Every unique ID refers to an individual instance of the Durable Object class
        const id = env.MY_DURABLE_OBJECT.idFromName("foo");
    

        // A stub is a client used to invoke methods on the Durable Object
        const stub = env.MY_DURABLE_OBJECT.get(id);
    

        // Methods on the Durable Object are invoked via the stub
        const response = await stub.sayHello("world");
    

        return response;
      },
    };

    Free plan limits apply to Durable Objects compute and storage usage. Limits allow developers to build real-world applications, with every Worker request able to call a Durable Object on the free plan.

    For more information, checkout:

  1. SQLite in Durable Objects GA with 10GB storage per object

    Durable Objects Workers

    SQLite in Durable Objects is now generally available (GA) with 10GB SQLite database per Durable Object. Since the public beta ↗ in September 2024, we've added feature parity and robustness for the SQLite storage backend compared to the preexisting key-value (KV) storage backend for Durable Objects.

    SQLite-backed Durable Objects are recommended for all new Durable Object classes, using new_sqlite_classes Wrangler configuration. Only SQLite-backed Durable Objects have access to Storage API's SQL and point-in-time recovery methods, which provide relational data modeling, SQL querying, and better data management.

    export class MyDurableObject extends DurableObject {
      sql: SqlStorage
      constructor(ctx: DurableObjectState, env: Env) {
        super(ctx, env);
        this.sql = ctx.storage.sql;
      }
    

      async sayHello() {
        let result = this.sql
          .exec("SELECT 'Hello, World!' AS greeting")
          .one();
        return result.greeting;
      }
    }

    KV-backed Durable Objects remain for backwards compatibility, and a migration path from key-value storage to SQL storage for existing Durable Object classes will be offered in the future.

    For more details on SQLite storage, checkout Zero-latency SQLite storage in every Durable Object blog ↗.

  1. Capture up to 256 KB of log events in each Workers Invocation

    Workers

    You can now capture a maximum of 256 KB of log events per Workers invocation, helping you gain better visibility into application behavior.

    All console.log() statements, exceptions, request metadata, and headers are automatically captured during the Worker invocation and emitted as JSON object. Workers Logs deserializes this object before indexing the fields and storing them. You can also capture, transform, and export the JSON object in a Tail Worker.

    256 KB is a 2x increase from the previous 128 KB limit. After you exceed this limit, further context associated with the request will not be recorded in your logs.

    This limit is automatically applied to all Workers.

  1. Playwright for Browser Rendering now available

    Browser Rendering

    We're excited to share that you can now use Playwright's browser automation capabilities ↗ from Cloudflare Workers.

    Playwright ↗ is an open-source package developed by Microsoft that can do browser automation tasks; it's commonly used to write software tests, debug applications, create screenshots, and crawl pages. Like Puppeteer, we forked ↗ Playwright and modified it to be compatible with Cloudflare Workers and Browser Rendering ↗.

    Below is an example of how to use Playwright with Browser Rendering to test a TODO application using assertions:

    Assertion example
    import type { Fetcher } from '@cloudflare/workers-types';
    import { launch } from '@cloudflare/playwright';
    import { expect } from '@cloudflare/playwright/test';
    

    interface Env {
      MYBROWSER: Fetcher;
    }
    

    export default {
      async fetch(request: Request, env: Env) {
    

        const browser = await launch(env.MYBROWSER);
        const page = await browser.newPage();
    

        await page.goto('https://demo.playwright.dev/todomvc');
    

        const TODO_ITEMS = todos.length > 0 ? todos : [
            'buy some cheese',
            'feed the cat',
            'book a doctors appointment'
        ];
    

        const newTodo = page.getByPlaceholder('What needs to be done?');
        for (const item of TODO_ITEMS) {
            await newTodo.fill(item);
            await newTodo.press('Enter');
        }
    

        await expect(page.getByTestId('todo-title')).toHaveCount(TODO_ITEMS.length);
    

        await Promise.all(TODO_ITEMS.map(
            (value, index) => expect(page.getByTestId('todo-title').nth(index)).toHaveText(value)
        ));
      },
    };

    Playwright is available as an npm package at @cloudflare/playwright ↗ and the code is at GitHub ↗.

    Learn more in our documentation.

  1. All cache purge methods now available for all plans

    Cache / CDN

    You can now access all Cloudflare cache purge methods — no matter which plan you’re on. Whether you need to update a single asset or instantly invalidate large portions of your site’s content, you now have the same powerful tools previously reserved for Enterprise customers.

    Anyone on Cloudflare can now:

    1. Purge Everything: Clears all cached content associated with a website.
    2. Purge by Prefix: Targets URLs sharing a common prefix.
    3. Purge by Hostname: Invalidates content by specific hostnames.
    4. Purge by URL (single-file purge): Precisely targets individual URLs.
    5. Purge by Tag: Uses Cache-Tag response headers to invalidate grouped assets, offering flexibility for complex cache management scenarios.

    Want to learn how each purge method works, when to use them, or what limits apply to your plan? Dive into our purge cache documentation and API reference ↗ for all the details.

  1. New Pause & Purge APIs for Queues

    Queues

    Queues now supports the ability to pause message delivery and/or purge (delete) messages on a queue. These operations can be useful when:

    • Your consumer has a bug or downtime, and you want to temporarily stop messages from being processed while you fix the bug
    • You have pushed invalid messages to a queue due to a code change during development, and you want to clean up the backlog
    • Your queue has a backlog that is stale and you want to clean it up to allow new messages to be consumed

    To pause a queue using Wrangler, run the pause-delivery command. Paused queues continue to receive messages. And you can easily unpause a queue using the resume-delivery command.

    Pause and resume a queue
    $ wrangler queues pause-delivery my-queue
    Pausing message delivery for queue my-queue.
    Paused message delivery for queue my-queue.
    

    $ wrangler queues resume-delivery my-queue
    Resuming message delivery for queue my-queue.
    Resumed message delivery for queue my-queue.

    Purging a queue permanently deletes all messages in the queue. Unlike pausing, purging is an irreversible operation:

    Purge a queue
    $ wrangler queues purge my-queue
    ✔ This operation will permanently delete all the messages in queue my-queue. Type my-queue to proceed. … my-queue
    Purged queue 'my-queue'

    You can also do these operations using the Queues REST API, or the dashboard page for a queue.

    Pause and purge using the dashboard

    This feature is available on all new and existing queues. Head over to the pause and purge documentation to learn more. And if you haven't used Cloudflare Queues before, get started with the Cloudflare Queues guide.