I built FAF using Zig on Bun for Claude

Source: Dev.to | Dec 23, 2025 (UTC)

⏺ 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)

bash bun add -g bun-sticky-faf bun-sticky score Zero deps. 328 tests. Pure Bun APIs. bun-sticky-zig (Zig) 77KB binary. 31µs scoring. 55 million ops/sec. Built in Bun's own language. 220X 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 | Metric | Value | |----------------|-------------| | Scoring speed | 31µs | | Ops/sec | 55 million | | Binary size | 77KB | | vs TS baseline | 220X faster | Why This Stack? Bun is fast. Zig is faster. Claude needs context. FAF provides it. The circle completes. https://dev-to-uploads.s3.amazonaws.com/uploads/articles/h31z2kpmcvbjxcgz4bpb.png Learn More - https://faf.one - https://faf.one/blog/bun-sticky-launch - https://faf.one/blog/bun-sticky-zig-launch - https://www.iana.org/assignments/media-types/application/vnd.faf+yaml

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