Vercel's AI SDK now drives any ACP agent harness, Grok Build first
The harness layer was capped at Claude Code, Codex and Pi; ACP support opens it to any Agent Client Protocol runtime — swap coding agents without a rewrite.
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One package, any Agent Client Protocol runtime
The new @ai-sdk/harness-acp package lets the AI SDK program any ACP-compatible agent, not just the built-in Claude Code, Codex and Pi adapters. The harness owns the workspace, sessions, permission flows and sub-agents; you drive it through the same HarnessAgent flow and stream straight into useChat. It's still experimental, so pin your versions before you ship.
Grok Build lands as a first-class adapter
The @ai-sdk/harness-grok-build adapter wires xAI's Grok Build coding agent into that same layer, so an app can run Grok Build's full loop without you recreating its tools. It's the first new harness to arrive on top of the ACP work.
Elsewhere: one-click Node.js upgrades and Exa in the marketplace
Vercel added a single-click path in the Dashboard to move projects off deprecated Node.js versions — worth doing before the runtime is force-upgraded under you. Separately, Exa's neural search joined the Vercel Agent Marketplace, giving agents a drop-in way to ground answers in fresh web data.
Elsewhere: Codex's desktop app lands on Linux
OpenAI shipped its combined ChatGPT + Codex desktop app to Linux in preview — .deb and .rpm for x64 and ARM64 on Ubuntu 24.04/26.04, Debian 13, and Fedora 43/44 — letting Codex work against local files, repos, and terminals natively. It trails Anthropic's Linux Claude app by about a month.