fx is now available in the AI SDK harness layer
Vercel's AI SDK harness layer now supports fx — one API for swapping coding agents without rebuilding integrations.
Why it matters
Standardization play: Vercel is lowering friction for developers to integrate multiple coding agents (Claude Code, Cursor, Cline, fx, etc.) via a unified harness and Agent Client Protocol. Matters if you're building agent-native tooling or evaluating which coding agents to support.
The key facts
10 to knowfx added to AI SDK harness layer alongside Claude Code, Cline, Codex, Cursor, Deep Agents, Grok Build, OpenCode, Pi
Integration via @ai-sdk/harness-fx adapter
Uses Agent Client Protocol (ACP) for agent communication
Open-source, lightweight coding agent from Vercel
Harness layer abstracts agent-swapping — one API for multiple coding agents
fx now supported via @ai-sdk/harness-fx adapter
Integration uses Agent Client Protocol (ACP)
fx joins 8 other coding agents on harness: Claude Code, Cline, Codex, Cursor, Deep Agents, Grok Build, OpenCode, Pi
Harness layer provides unified API for agent integration
Open-source, lightweight agent positioning
Go to the source
Vercel Blogvercel.com
Publisher excerpt: The now supports , Vercel's lightweight, open-source coding agent. The harness layer provides one API for running coding agents in your application, so you can add fx without building a separate integration.AI SDK harness layerfx Configure with the official adapter: HarnessAgent@ai-sdk/harness-fx…