Vercel Ships HarnessAgent for Unified Agent Harness Integration

Vercel

Jun 13, 2026

Vercel launched HarnessAgent in AI SDK v7, a unified API for running agent harnesses including Claude Code, Codex, and Pi. It provides sandboxed sessions and AI SDK-compatible streams, allowing developers to write agent logic once and swap the underlying harness by changing a single import. This experimental release normalizes multi-turn agent workflows across different runtimes.

View the full update on vercel.com

Vercel Developers

@vercel_dev1d ago

AI SDK now supports agent harnesses like Claude Code, Codex, and Pi with sandboxed sessions and AI SDK-compatible streams: 𝚌𝚘𝚗𝚜𝚝 𝚊𝚐𝚎𝚗𝚝 = 𝚗𝚎𝚠 𝙷𝚊𝚛𝚗𝚎𝚜𝚜𝙰𝚐𝚎𝚗𝚝({ 𝚑𝚊𝚛𝚗𝚎𝚜𝚜: 𝚌𝚕𝚊𝚞𝚍𝚎𝙲𝚘𝚍𝚎, 𝚜𝚊𝚗𝚍𝚋𝚘𝚡:

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