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Vercel Labs releases fx, a 6MB Zig coding agent that cold-starts in 10 microseconds and runs in WebAssembly
fx is an experimental (v0.0.4, Apache-2.0) coding agent harness written in Zig, shipping as a ~6MB binary with a single-digit-megabyte memory baseline and ~10µs cold starts. It is model and provider agnostic, deliberately keeps a minimal system prompt and tool set, and compiles to WebAssembly with pluggable networking. It hit 290 points on Hacker News in the last 24 hours; the interesting part for builders is that an agent harness small enough to embed inside another process changes where agents can run, not just how fast they start.
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