---
description: This release adds resumable streaming over websockets, enhanced MCP client APIs with connection state observability, improved schedule reliability, and SSE transport enhancements.
title: Agents SDK v0.2.24 with resumable streaming, MCP improvements, and schedule fixes
image: https://developers.cloudflare.com/changelog/post/2025-11-26-agents-resumable-streaming/og.png?v=7463d10f54ee76e2
---

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November 26, 2025

## Agents SDK v0.2.24 with resumable streaming, MCP improvements, and schedule fixes

[Agents](https://developers.cloudflare.com/agents/) [Workers](https://developers.cloudflare.com/workers/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2025-11-26-agents-resumable-streaming/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

The latest release of [@cloudflare/agents ↗︎](https://github.com/cloudflare/agents) brings resumable streaming, significant MCP client improvements, and critical fixes for schedules and Durable Object lifecycle management.

#### Resumable streaming

`AIChatAgent` now supports resumable streaming, allowing clients to reconnect and continue receiving streamed responses without losing data. This is useful for:

- Long-running AI responses
- Users on unreliable networks
- Users switching between devices mid-conversation
- Background tasks where users navigate away and return
- Real-time collaboration where multiple clients need to stay in sync

Streams are maintained across page refreshes, broken connections, and syncing across open tabs and devices.

#### Other improvements

- Default JSON schema validator added to MCP client
- [Schedules](https://developers.cloudflare.com/agents/agent-class/schedule-tasks/) can now safely destroy the agent

#### MCP client API improvements

The `MCPClientManager` API has been redesigned for better clarity and control:

- **New `registerServer()` method**: Register MCP servers without immediately connecting
- **New `connectToServer()` method**: Establish connections to registered servers
- **Improved reconnect logic**: `restoreConnectionsFromStorage()` now properly handles failed connections

```ts
// Register a server to Agent
const { id } = await this.mcp.registerServer({
	name: "my-server",
	url: "https://my-mcp-server.example.com",
});

// Connect when ready
await this.mcp.connectToServer(id);

// Discover tools, prompts and resources
await this.mcp.discoverIfConnected(id);
```

The SDK now includes a formalized `MCPConnectionState` enum with states: `idle`, `connecting`, `authenticating`, `connected`, `discovering`, and `ready`.

#### Enhanced MCP discovery

MCP discovery fetches the available tools, prompts, and resources from an MCP server so your agent knows what capabilities are available. The `MCPClientConnection` class now includes a dedicated `discover()` method with improved reliability:

- Supports cancellation via AbortController
- Configurable timeout (default 15s)
- Discovery failures now throw errors immediately instead of silently continuing

#### Bug fixes

- Fixed a bug where [schedules](https://developers.cloudflare.com/agents/agent-class/schedule-tasks/) meant to fire immediately with this.schedule(0, ...) or `this.schedule(new Date(), ...)` would not fire
- Fixed an issue where schedules that took longer than 30 seconds would occasionally time out
- Fixed SSE transport now properly forwards session IDs and request headers
- Fixed AI SDK stream events conversion to UIMessageStreamPart

#### Upgrade

To update to the latest version:

```sh
npm i agents@latest
```

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