AI SDK Harnesses

AI SDK harness adapters connect HarnessAgent to established agent runtimes. They are separate from model providers, but they expose AI SDK-compatible stream and response primitives.

Claude Code

Use Claude Code through the AI SDK harness abstraction.

Cline

Use the Cline SDK through the AI SDK harness abstraction.

Codex

Use Codex through the AI SDK harness abstraction.

Cursor

Use Cursor through the AI SDK harness abstraction.

Use fx through the AI SDK harness abstraction.

GitHub Copilot

Use GitHub Copilot through the AI SDK harness abstraction.

Grok Build

Use Grok Build through the AI SDK harness abstraction.

OpenCode

Use OpenCode through the AI SDK harness abstraction.

Use Pi through the AI SDK harness abstraction.

Agent Client Protocol

Use any ACP compatible harness through the AI SDK harness abstraction.

Usage

All harness adapters are used with HarnessAgent:

import { HarnessAgent } from '@ai-sdk/harness/agent';
import { codex } from '@ai-sdk/harness-codex';
import { createVercelNetworkSandboxSession } from '@ai-sdk/sandbox-vercel';

const agent = new HarnessAgent({
  harness: codex,
  model: 'gpt-5.6-luna',
});

const sandboxSession = await createVercelNetworkSandboxSession({
  runtime: 'node24',
  ports: [4000],
  template: await agent.getSandboxTemplate(),
});
const session = await agent.createSession({ sandboxSession });
try {
  console.log(
    (await agent.generate({ session, prompt: 'Inspect this project.' })).text,
  );
} finally {
  await session.destroy();
  await sandboxSession.destroy();
}

Read the Harnesses documentation for sessions, tools, UI, and terminal usage.