# fx is now available in the AI SDK harness layer

DevFeed: [fx is now available in the AI SDK harness layer](<https://devfeed.tech/articles/fx-is-now-available-in-the-ai-sdk-harness-layer-942.md>)

Original publisher: [Read original article](<https://vercel.com/changelog/fx-ai-sdk-harness-adapter>)

Author: Felix Arntz

Published: 2026-08-31T06:00:00Z

Content type: release

Language: en

Sources: [Vercel News](<https://devfeed.tech/sources/vercel-news.md>)

Topics: [vercel ai sdk](<https://devfeed.tech/topics/vercel-ai-sdk.md>), [SDKs](<https://devfeed.tech/topics/sdks.md>), [Vercel](<https://devfeed.tech/topics/vercel.md>), [AI-assisted coding](<https://devfeed.tech/topics/ai-assisted-coding.md>), [API](<https://devfeed.tech/topics/api.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>)

Tags: [agent](<https://devfeed.tech/tags/agent.md>), [agents](<https://devfeed.tech/tags/agents.md>), [ai](<https://devfeed.tech/tags/ai.md>), [api](<https://devfeed.tech/tags/api.md>), [building](<https://devfeed.tech/tags/building.md>), [claude](<https://devfeed.tech/tags/claude.md>), [claude-code](<https://devfeed.tech/tags/claude-code.md>), [codex](<https://devfeed.tech/tags/codex.md>), [coding-agents](<https://devfeed.tech/tags/coding-agents.md>), [cursor](<https://devfeed.tech/tags/cursor.md>), [integration](<https://devfeed.tech/tags/integration.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [opencode](<https://devfeed.tech/tags/opencode.md>), [sdk](<https://devfeed.tech/tags/sdk.md>), [vercel](<https://devfeed.tech/tags/vercel.md>)

## AI overview

Vercel's AI SDK harness layer now supports fx, a lightweight open-source coding agent. Developers can run fx in their applications through the HarnessAgent interface using the official @ai-sdk/harness-fx adapter, which connects through the Agent Client Protocol via @ai-sdk/harness-acp.

## Source excerpt

The AI SDK harness layer now supports fx, 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. Configure HarnessAgent with the official @ai-sdk/harness-fx adapter: The @ai-sdk/harness-fx adapter connects to fx over the Agent Client Protocol (ACP) using @ai-sdk/harness-acp. fx joins Claude Code, Cline, Codex, Cursor, Deep Agents, Grok Build, OpenCode, and Pi in the list of supported harnesses. Read the fx harness documentation to get started. Read more