fx (by Vercel)
Vercel's tiny, open-source coding agent
fx (by Vercel) launched on August 21, 2026 with 224 votes, #131 of 23,274 launches that month and more than 99% of that year's launches.
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.
v0.0.14 (notes) · 6.66mib · 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 . fx is a coding agent harness and CLI written in Zig, optimized for research and embeddability as part of larger systems. It focuses on minimalism and performance across the board, from system prompt design to its tools, feature set, and 6.66 MiB binary. Its output is closer to a Unix shell than an IDE in the terminal. It is open source (Apache-2.0), model-agnostic, and suitable for both local and cloud inference.…from fx.sh
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