We keep iterating on 𝙷𝚊𝚛𝚗𝚎𝚜𝚜𝙰𝚐𝚎𝚗𝚝. Write your agent once, run it on any harness.
AI SDK (@aisdk)
𝙷𝚊𝚛𝚗𝚎𝚜𝚜𝙰𝚐𝚎𝚗𝚝 now supports 𝚜𝚝𝚘𝚙𝚆𝚑𝚎𝚗 for per-step control
— https://nitter.net/aisdk/status/2082134111725183324#m
HarnessAgent is being actively iterated by the AI SDK team—announcement posted by…
Brief
HarnessAgent is an iterated agent framework from AI SDK (announced 2026-07-28) that emphasizes write-once, run-anywhere usage: developers can create an agent once and deploy it across different harnesses. The recent update adds stopWhen for per-step control, allowing conditional termination of individual steps during execution.
Why it matters
HarnessAgent is being actively iterated by the AI SDK team—announcement posted by @aisdk and shared by @cramforce on 2026-07-28.
Key details
- HarnessAgent now supports a new stopWhen feature for per-step control, enabling agents written once to run on any harness with conditional step termination.