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wire 2026-06-10
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NEXT.JS 16.3 APP SHELLS GO STABLE, AI SDK FIXES STREAMING TIMEOUT BUG

By RepoJournal · Filed · About Vercel · Composed from the cited sources · methodology

aurorascharff allenzhou101 ishaksebsib gaojude
4 people shipped this
aurorascharff @aurorascharff 1 cited allenzhou101 @allenzhou101 1 cited ishaksebsib @ishaksebsib 1 cited gaojude @gaojude 1 cited

The playground is live with Next.js 16.3's self-upgrading app shells, Vercel's AI SDK patched a critical timeout bug that left streams hanging indefinitely, and Claude Fable 5 hit 96% on coding evals with agent context.

The next-app-router-playground shipped a major rename aligned with Next.js 16.3's official App Shells feature [1], ditching experimental flags like `unstable_instant` and `optimisticRouting` that are now either default or removed entirely. Meanwhile, vercel/ai fixed a nasty bug where `streamText()` with `timeout.stepMs` would never abort a stalled model stream that opened but never produced content [2]. The fix mirrors the correct behavior already working in `generateText`, so timeouts now fire across all streaming modes. On the Connect front, @vercel/connect 0.2.1 [3] added a `revokeToken` API and introduced `forceRefresh` for real-time token validation [4], solving the problem where revoked-but-unexpired tokens kept working until natural expiry. The Chat SDK now routes Telegram slash commands properly [6], and vercel/functions 3.7.0 shipped an experimental WebSocket upgrade API [5] for runtime bidirectional communication. Claude Fable 5 eval results show 96% pass rate with agent context [7], running through the Vercel AI Gateway with data-retention enabled.

Action items

References

  1. [1] Update partial fallbacks -> appshell upgrading example ↗ vercel/next-app-router-playground
  2. [2] fix(ai): enforce timeout.stepMs for the whole step in streamText (#15840) vercel/ai ↗
  3. [3] @vercel/connect@0.2.1 ↗ vercel/vercel
  4. [4] [@vercel/connect] re-validate revoked grants via opt-in validate/forceRefresh ↗ vercel/vercel
  5. [5] @vercel/functions@3.7.0 ↗ vercel/vercel
  6. [6] feat(telegram): support slash commands ↗ vercel/chat
  7. [7] Add Claude Fable 5 eval results ↗ vercel/next-evals-oss

$ ls vercel/reviews/ # the step-back reads

the week in review Turborepo adds Go workspace graph, fixes hashing the month in review Workflow 4.8 overhauls delivery and sessions, Eve compacts traces, Turbopack cache defaults on
Full archive → Weekly reviews →

Quick answers

What shipped in Vercel on June 10, 2026?
The playground is live with Next.js 16.3's self-upgrading app shells, Vercel's AI SDK patched a critical timeout bug that left streams hanging indefinitely, and Claude Fable 5 hit 96% on coding evals with agent context. In total, 22 commits, 27 pull requests, and 13 releases landed.
Who contributed to Vercel on June 10, 2026?
4 developers shipped this update, including aurorascharff, allenzhou101, ishaksebsib, and gaojude.
What were the notable Vercel updates?
Update partial fallbacks -> appshell upgrading example, fix(ai): enforce timeout.stepMs for the whole step in streamText (#15840), and @vercel/connect@0.2.1.
♥

$ log @vercel --recent

Turbopack GC gets a config key and the runtime sheds peer state 172 shipped xAI drops Chat Completions, eve breaks registry installs, Turbopack widens tree-shaking 155 shipped Next.js fixes cache warming env bug, eve gains audience hooks 167 shipped Turborepo patches Remix and Nuxt env hashing, shop ships Eve agent 10 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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