agents new version changelog (#26768)

* agents new version changelog

* fix extension issue

* nits

* more nits

* fix nits

* fixes

Author: whoiskatrin

src/content/changelog/agents/2025-11-26-agents-resumable-streaming.mdx

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+---
+title: Agents SDK v0.2.24 with resumable streaming, MCP improvements, and schedule fixes
+description: This release adds resumable streaming over websockets, enhanced MCP client APIs with connection state observability, improved schedule reliability, and SSE transport enhancements.
+products:
+  - agents
+  - workers
+date: 2025-11-26
+---
+
+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/api-reference/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/api-reference/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 convertion to UIMessageStreamPart
+
+### Upgrade
+
+To update to the latest version:
+
+```sh
+npm i agents@latest
+```