# Cline is now available in the AI SDK harness layer

By Steven Van · 2026-08-18

The AI SDK harness layer lets you run established coding-agent runtimes through one unified interface, so you can switch runtimes without changing your…

Cline has joined the harness layer in [Vercel](<https://creatorstoolbox.com/tools/vercel>)'s AI SDK, which lets developers run established coding-agent runtimes through one unified HarnessAgent interface and switch between them without changing application code. The new adapter, **@ai-sdk/harness-cline**, was built in collaboration with the Cline team.

Cline runs fully in the host process and uses the sandbox only as a remote filesystem and shell, so no bridge process is installed inside the sandbox, the same approach used for the existing Pi harness. The full list of supported harnesses is now Claude Code, Cline, Codex, Deep Agents, Grok Build, OpenCode, and Pi, with more [planned](<https://vercel.com/changelog/cline-harness-adapter>).

[![](<https://assets.vercel.com/image/upload/contentful/image/e5382hct74si/2cYTu4xzwJOSDWWritIZL3/857ec383f12c5d6e073b2bbd16ee2764/image.png>)](<https://vercel.com/changelog/cline-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>)

Sources

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

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

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