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fx
Vercel LabsmeasuredA whole coding agent in one Zig binary with no runtime to install, plus a WebAssembly build that drops the same core into a JavaScript host. Permissions are enforced inside the harness.
spec
- Maker
- Vercel Labs
- Kind
- other
- Version
- 0.0.3 · checked 2026-08-20
- License
- Apache-2.0
- npm
- Not published to npm. The npm package named fx is an unrelated command-line JSON viewer.
- Repository
- github.com/vercel-labs/fx
getting it
curl -fsSL https://fx.sh/setup.sh | bash
how it is built
- Language
- Zig
- Ships as
- Single binary
- What it can enforce
- Gate in the harness
- Out of the box
- Gated by default
- Extends via
- Skills and MCP · Subagents
- Embeds via
- WASM and ACP
- Runtime
- Native
- Licence
- Apache-2.0
going deeper
This one is measured. Every concept in its docs is laid out as a place, sized by how much source sits behind it, with a real recorded turn you can step through.
open fx in the playground