fx: a tiny open-source coding agent in Zig with a 5.97 MiB single binary
evilrabbit_ · x · 2026-11-10
fx, an Apache-2.0 coding agent harness and CLI written in Zig, released v0.0.16 with a minimalist, embeddable design — the whole binary is just 5.97 MiB.
- One native binary for terminal, CI, or agent sandboxes; no background service, supports interactive sessions and one-shot fx ask requests
- Runs in the browser via WebAssembly (libfx), with the app controlling storage, tools, and networking; the site demos the full CLI compiled to WASM
- Unix shell-like UI: scroll history preserved, tool activity kept in-conversation
- Concise tool schemas keep context small; skills and MCP tool schemas load on demand
- Model- and provider-agnostic: local models, gateways, direct API access, or subscriptions
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