# fx is now available in the AI SDK harness layer

By Steven Van · 2026-08-31

The AI SDK harness layer now supports fx, Vercel's lightweight, open-source coding agent.

[Vercel](<https://creatorstoolbox.com/tools/vercel>)'s AI SDK harness layer now supports fx, its own lightweight, open-source coding agent, via the official @ai-sdk/harness-fx adapter. The adapter connects to fx over the Agent Client Protocol using @ai-sdk/harness-acp, so it can be configured with HarnessAgent without a separate integration. fx joins Claude Code, Cline, Codex, Cursor, Deep Agents, Grok Build, OpenCode and Pi in the [list of supported harnesses](<https://vercel.com/changelog/fx-ai-sdk-harness-adapter>).

[![](<https://assets.vercel.com/image/upload/contentful/image/e5382hct74si/2Uqe6dcqRd3eBd77QUzf8V/2570ac4428c01ff0781e8a24438fc0b3/fx_ai_sdk_harness_adapter_og_card_og_card.jpg>)](<https://vercel.com/changelog/fx-ai-sdk-harness-adapter>)

![Vercel](<https://www.google.com/s2/favicons?domain=vercel.com&sz=128>)

Vercel

The platform for frontend developers — deploy, preview, and scale web apps and AI agents with zero config.

[View Vercel →](<https://creatorstoolbox.com/tools/vercel>)

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

[Read fx is now available in the AI SDK harness layer on Creators Toolbox](<https://creatorstoolbox.com/blog/vercel-fx-is-now-available-in-the-ai-sdk-harness-layer>)

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Canonical source: https://creatorstoolbox.com/blog/vercel-fx-is-now-available-in-the-ai-sdk-harness-layer