ToolsAugust 31, 2026via Vercel Blog
fx is now available in the AI SDK harness layer
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.
Key signals
- fx 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
The hook
Vercel's AI SDK harness layer now supports fx — one API for swapping coding agents without rebuilding integrations.
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…