Vercel shipped [email protected] on 2026-09-30 (compare): optional SSE heartbeats keep idle UI message streams open; prune all tool content when retaining zero trailing messages; ignore pending tool approvals superseded by user messages; preserve partial reasoning tags at streamed text ends. Build migrates tsup→tsdown with gateway/provider/utils bumps.
Key Takeaways
- ✓Release
[email protected]at 2026-09-30T02:21:24Z; compare to 7.0.122 - ✓Optional SSE heartbeats keep idle UI message streams open behind proxies (
05cdac6) - ✓Prune all tool content when retaining zero trailing messages (
4514fc1); preserve partial reasoning tags (2a625cf) - ✓Ignore pending tool approvals superseded by newer user messages (
50a26d5) - ✓tsup→tsdown; gateway/provider/utils bumps; docs https://ai-sdk.dev/docs/introduction ; npm https://www.npmjs.com/package/ai
Key Decision Metrics at a Glance
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Project Links & Resources
Direct AccessIn-Depth Technical Analysis
Background
Agent/chat UIs lose idle SSE behind proxies, leave tool content when retain=0, and stall when user messages supersede pending tool approvals. [email protected] targets those runtime edges.
What shipped
[[email protected]](https://github.com/vercel/ai/releases/tag/[email protected]): optional SSE heartbeats; prune tool content at retain=0; ignore superseded approvals; preserve partial reasoning tags; tsup→tsdown + gateway/provider/utils bumps. Compare.
Benchmarks
No official SWE-bench numbers. Anchors: publish 2026-09-30T02:21:24Z, npm [email protected]. Measure your own idle-stream and approval regressions.
Get started
npm i [email protected]. Docs: https://ai-sdk.dev/docs/introduction
Benchmark side-by-side against alternatives, or calculate monthly token cost vs subscription break-even.
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