Docs reference `HarnessAgent` which is not exported from `packages/ai`
packages/ai/src/index.ts
export * from './agent' // L40The AI SDK also includes a harness abstraction for using established agent harnesses such as Claude Code, Codex, and Pi through `HarnessAgent`.The documentation advertises `HarnessAgent` as the public API for the harness abstraction, but the `packages/ai` index exports its agent surface via `export * from './agent'` with no `HarnessAgent` symbol visible in the provided API surface. A developer following the intro will attempt to `import { HarnessAgent } from 'ai'` and find no such export (or a differently named one), causing an import error or confusion about the correct symbol.
Either export `HarnessAgent` (or the actual harness class name) from `packages/ai/src/index.ts`/`./agent`, or update the introduction to reference the correct exported symbol (e.g. the real agent class name) and link to its API reference.