fx

```
 ⠀⠀⠀⠀⠀⠀⣠⣾⣿⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀
 ⠀⠀⠀⠀⠀⢰⣿⡿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
 ⠀⠀⠀⣠⣶⣿⣿⣷⣶⡶⣶⣶⣆⠀⠀⠀⣴⣶⣶⠆
 ⠀⠀⠀⠉⢹⣿⣿⠉⠉⠀⠘⢿⣿⣧⣀⣾⣿⡿⠃⠀             Tiny, open, embeddable, native coding agent.
 ⠀⠀⠀⠀⣼⣿⡏⠀⠀⠀⠀⠀⠻⣿⣿⣿⠟⠀⠀⠀
 ⠀⠀⠀⢀⣿⣿⠃⠀⠀⠀⠀⢠⣦⠘⢿⣿⣷⡀⠀⠀             curl -fsSL https://fx.sh/setup.sh | bash
 ⠀⠀⠀⣸⣿⡟⠀⠀⠀⠀⣰⣿⣿⠗⠀⠻⣿⣿⣄⠀
 ⠀⠀⠀⣿⣿⠇⠀⠀⠀⠾⠿⠿⠋⠀⠀⠀⠘⠿⠿⠦             ⚠ Status: Experimental. Use at your own risk.
  ⠀⣸⣿⡿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
 ⣿⣿⣿⠟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
```

# fx

fx is a minimal coding agent CLI that still comes with batteries included. It's one native binary written in Zig, so there is no runtime to install, and it runs the same on your laptop, in CI, or inside an agent sandbox. Its output is closer to a Unix shell than an IDE, because the conversation prints into your terminal's scrollback instead of filling the screen.

fx is meant to be embedded and extended. Scripts call it with `fx ask`, editors connect over the Agent Client Protocol (ACP), and JavaScript apps run the same agent core through [libfx](sdk/README.md) with their own tools. Skills, MCP servers, and your project's `AGENTS.md` add to what the agent knows and can do.

<p>
  <a href="https://vercel.com/labs#labs-products"><img alt="Vercel Labs Product" src="https://img.shields.io/badge/LABS-PRODUCT-0a0a0a.svg?style=for-the-badge&amp;logo=Vercel&amp;labelColor=000000" height="28"></a>
  <a href="https://github.com/vercel-labs/fx/releases/latest"><img alt="fx CLI release" src="https://img.shields.io/github/v/release/vercel-labs/fx.svg?style=for-the-badge&amp;labelColor=000000&amp;label=release" height="28"></a>
  <a href="https://github.com/vercel-labs/fx/blob/main/LICENSE"><img alt="License: Apache-2.0" src="https://img.shields.io/github/license/vercel-labs/fx.svg?style=for-the-badge&amp;labelColor=000000" height="28"></a>
</p>

## Features

- **Small and fast**: CI fails a pull request if any benchmarked command, such as `fx help` or `fx status --json`, takes longer than 2 ms on Linux ([benchmarks](benchmarks/)). Stable releases for Apple silicon must also fit under a fixed size limit.
- **Built-in tools**: fx finds, reads, and edits files, runs shell commands, searches the web and reads URLs, and delegates work to subagents. A development server or file watcher can keep running while it works ([tools](https://fx.sh/docs/capabilities/tools)).
- **Model choice**: sign in to Vercel AI Gateway, use a ChatGPT or Grok subscription, or connect an OpenAI-compatible Chat Completions endpoint such as Ollama or OpenRouter ([custom model connections](https://fx.sh/docs/configure-fx/custom-model-connections)).
- **Inline output**: you can scroll, search, and copy the conversation like any other command's output, and tmux bindings and copy mode keep working. Terminals that support the [Program Status Protocol](https://www.superlogical.com/rex/docs/build/program-status) can also show when fx is busy or waiting for you.
- **Your own shell**: commands run in your login shell, with your aliases, functions, and `PATH`. fx runs your startup files once and reuses the r