fx (by Vercel)
Vercel's tiny, open-source coding agent
What it does
fx is Vercel's tiny, open-source coding agent built to get out of your way. Written in Zig and shipped as a ~6MB native binary, it starts almost instantly while keeping memory and context overhead low. Use it with local or cloud models, extend it with skills, plugins and MCPs, or embed it into your own agent infrastructure. Small by design, so the model gets more room to work.
Tiny, open, native coding agent. A minimal CLI written in Zig, optimized for research and embeddability as part of larger systems.
v0.0.7 (notes) · 6.19mib · status: experimental (i) use at your own risk, we will be making frequent changes This demo runs the full fx CLI as WebAssembly compiled with the Zig toolchain. Networking is delegated to browser fetch , and every SDK aspect is configurable in the docs . 𝒇 x v0.0.7 · Run /help for commands ┃ auto · kimi-k3 (i) This demo is available in browsers with WebAssembly JSPI support, like Safari 27+ and Chrome. This demo runs fx in WebAssembly with a browser workspace powered by just-bash . Install fx for the full tool suite on your own files. fx is a coding agent harness and CLI written in Zig, optimized for research and embeddability as part of larger systems. It…from fx.sh
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