# Nix Packaging

> - Nix derivations — stdenv.mkDerivation and the phase model, fixed-output hashes for src fetchers, language-builder dependency hashes (cargoHash, vendorHash, npmDepsHash), the lib.fakeHash → copy-real-hash workflow, and meta attributes. Use when writing, debugging, or reviewing a derivation, packaging a Rust/Go/Python/Node project, or fixing a hash mismatch. Triggers: mkDerivation, buildRustPackage, buildGoModule, vendorHash, cargoHash, fetchFromGitHub.

## Facts
- Page: https://tashan.sh/capability/skill-gurinderu-nix-packaging
- tashan id: skill:gurinderu/nix-packaging
- Source: https://github.com/gurinderu/craft
- Type: skill
- Category: comms
- tashan score: not scored (catalogued only — too little public evidence)
- Adoption: 9.0
- Upkeep: 100.0
- Freshness: 99.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- Official: no

## Install

```sh
cp -r nix-packaging ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-08-09 by tashan (https://tashan.sh) from public evidence. Scorer s5.