CF-Changes Agents, Workers - Agents SDK v0.2.24 with resumable streaming, MCP improvements, and schedule fixes

[ENF News Bot]

The latest release of @cloudflare/agents ↗︎ brings resumable streaming, significant MCP client improvements, and critical fixes for schedules and Durable Object lifecycle management.

Resumable streaming​

https://developers.cloudflare.com/changelog/rss/#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​

https://developers.cloudflare.com/changelog/rss/#other-improvements

• Default JSON schema validator added to MCP client
• Schedules can now safely destroy the agent

MCP client API improvements​

https://developers.cloudflare.com/changelog/rss/#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

// 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​

https://developers.cloudflare.com/changelog/rss/#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​

https://developers.cloudflare.com/changelog/rss/#bug-fixes

• Fixed a bug where schedules 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​

https://developers.cloudflare.com/changelog/rss/#upgrade

To update to the latest version:


npm i agents@latest

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