fx is now available in the AI SDK harness layer

Vercel expanded its AI toolkit by bringing fx, its open-source coding assistant, into the AI SDK harness layer. For anyone building modern web apps, this update lets you run automated coding tasks directly inside your projects using a single, unified interface.

Think of the harness layer like a universal power strip for AI tools. Instead of writing separate, complicated connectors for each assistant, you can now plug in fx alongside existing options like Cursor and Claude Code with just a few lines of setup.

If you are learning to build software with AI, updates like this remove the heavy lifting. You can experiment with different coding agents behind the scenes without rewriting your application logic, keeping your focus where it belongs: on shipping useful features for your users.