The fx adapter now runs the harness on the host
The fx adapter for the AI SDK’s HarnessAgent now uses libfx , the TypeScript library for fx. The harness and model requests run in your application’s process, while built-in filesystem and shell operations remain isolated in the sandbox. This simplifies sandbox setup: you no longer need to install fx inside the sandbox, run a sandbox bridge, or expose a sandbox port. Model credentials stay on the host, outside the environment where the agent runs commands. The rewrite also adds: Built-in tool fi
- Type
- Not stated
- Industry
- Developer tools
- Deployment
- Not stated
- Stack
- VercelTypeScript
The rewrite also adds: Built-in tool filtering: choose which built-in tools the agent can use Mid-turn steering: send new instructions while a turn is running Structured output: generate responses that match a schema Image tool results: return images to the model through toModelOutput() Sessions can be saved and resumed in a new host process.
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