I built FAF using Zig on Bun for Claude

Source: Dev.to

⏺ Yes, that title is real. Let me explain.
FAF = Foundational AI‑context Format (IANA registered)
Zig = The language Bun is built with
Bun = The fast JS runtime
Claude = Anthropic’s AI

The Problem

AI coding tools have amnesia. Every session starts from zero. You explain your stack, your conventions, your architecture—gone.

The Solution

A file format that persists. .faf – your project’s DNA for any AI.

I Built Two CLIs

bun-sticky-faf (TypeScript)

bun add -g bun-sticky-faf
bun-sticky score

Zero deps. 328 tests. Pure Bun APIs.

bun-sticky-zig (Zig)

77 KB binary. 31 µs scoring. 55 million ops/sec.
Built in Bun’s own language. 220× faster than TypeScript.

Why Bun?

Bun’s philosophy aligns with FAF: fast, lean, no bloat. Zig (Bun’s core language) takes it further—freestanding WASM, no hidden allocations, raw speed.

The Numbers

Why This Stack?

Bun is fast. Zig is faster. Claude needs context. FAF provides it. The circle completes.

Learn More