agents@0.12.1

cloudflare/agentsagents@0.12.1May 1, 2026by github-actions[bot]

AI Summary

This is a patch release (0.12.1) that fixes three issues in the Cloudflare Agents SDK: sub-agent WebSockets on deployed Workers, chat stream resumption with partial hydration, and a race condition in drill-in chat connections during resume acknowledgment.

Key Highlights

Fixed sub-agent WebSockets on deployed Workers by keeping the browser WebSocket owned by the parent Agent and forwarding events over RPC
Fixed resumed chat streams to rebuild partially hydrated assistant responses from replay chunks instead of rendering replayed text as duplicate text parts
Fixed a resume ACK race condition where drill-in chat connections could miss terminal stream frames between resume notification and client acknowledgement

Full Release Notes

### Patch Changes

-   [#1443](https://github.com/cloudflare/agents/pull/1443) [`e7d225b`](https://github.com/cloudflare/agents/commit/e7d225b72a743a2cf1491ebf73f06580c668e560) Thanks [@threepointone](https://github.com/threepointone)! - Fix sub-agent WebSockets on deployed Workers by keeping the browser WebSocket owned by the parent Agent and forwarding connect/message/close events to child facets over RPC.

    Fix resumed chat streams so a partially hydrated assistant response is rebuilt from replay chunks instead of rendering replayed text as a second assistant text part.

    Fix a resume ACK race where drill-in chat connections could miss the terminal stream frame if the helper completed between the resume notification and client acknowledgement.