Dispatch
Vercel's AI SDK harness layer now runs nine coding agents behind one API, including its own fx
Vercel added its open-source coding agent fx to the AI SDK harness layer on August 31, joining Claude Code, Cline, Codex, Cursor, Deep Agents, Grok Build, OpenCode and Pi. The pattern is a two-line swap: import the `@ai-sdk/harness-fx` adapter and pass it to `new HarnessAgent({ harness: fx })`, with fx connecting through the Agent Client Protocol via `@ai-sdk/harness-acp`. For anyone embedding a coding agent in a product, this is the first credible attempt at making the harness a swappable dependency rather than a rewrite.
↳ Follow the thread