Base-X UI: Component library that talks to agents

Base-X UI ships with an MCP server and 10 tools an agent can call before writing a single line of code. It describes what it wants in plain language, gets back the right component, exact imports, required props, and a warning if it's about to make a mistake.

Built on Base UI (unstyled, accessible primitives) and StyleX (Meta's build-time CSS extraction). Every component ships with structured metadata an agent can figure out: what it does, when to use it, and what to avoid. The MCP server returns data. The agent gets what it needs to write correct code on the first pass.

Where it's at

The docs are live. The core idea (a component library designed for agent consumers, not just human ones) is proving out. One thing is for sure: agents write cleaner code when they can query the library directly instead of guessing from docs.