Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add breakds/claude.bds --skill nix-packaginggit clone --depth 1 https://github.com/breakds/claude.bdsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/breakds/claude.bds/nix-packaging)<a href="https://agentmods.dev/skills/breakds/claude.bds/nix-packaging"><img src="https://agentmods.dev/badge/skills/breakds/claude.bds/nix-packaging/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/breakds/claude.bds/nix-packaging"><img src="https://agentmods.dev/badge/skills/breakds/claude.bds/nix-packaging.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00014 | $0.00386 |
| Opus 5.5 | $0.00006 | $0.00154 |
| Sonnet 5.5 | $0.00003 | $0.00077 |
| Haiku 4.5 | $0.00001 | $0.00039 |
Grade A, and why
Nix Packaging scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Overview
Create new Nix packages or update existing ones, with language-specific examples and guidance.
Workflow: Creating a New Package
- Identify the software source: internal to this repo or external (e.g., a GitHub repository).
- Determine the programming language(s) used.
- Analyze the software structure (build system, dependencies, configuration files).
- Create the package following language-specific guidance below.
- Optionally, integrate the package into the current project (e.g., add to overlay and expose via
packagesinflake.nix). - Test iteratively: run
nix build .#<package-name>, read errors, fix issues, and rebuild until successful.
Workflow: Updating an Existing Package
Typically, update the version and source fetching attributes (e.g., fetchFromGitHub). The hash field must also be updated using one of these methods:
Method 1: Calculate the new hash directly
# Get the hash
nix-prefetch-url --type sha256 --unpack https://github.com/owner/repo/archive/refs/tags/v<NEW_VERSION>.tar.gz
# Convert to SRI format
nix hash convert --hash-algo sha256 <old-hash>
Method 2: Let Nix tell you the hash
Set hash = ""; and run the build. The error message will display the correct hash.
For language-specific update steps, see the references below.
Language-Specific Packaging Skills
- Python - Packaging Python modules
- Rust - Packaging Rust applications
- JavaScript/TypeScript - Packaging npm applications
What ships with it
11 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- js/claude-code/package-lock.json 7.5 KB
- js/claude-code/package.nix 1.4 KB
- js/js.md 3.1 KB
- python/agno/package.nix 1.4 KB
- python/darts/package.nix 1.3 KB
- python/python.md 2.2 KB
- python/swanboard/package.nix 1.4 KB
- python/tantivy/package.nix 1008 B
- python/tyro/package.nix 704 B
- rust/codex/package.nix 2.0 KB
- rust/rust.md 416 B
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 41 lines · 14 tokens per session scan A 150c14e2ff30
Nix Packaging is a skill published in the GitHub repository breakds/claude.bds (2 stars, last pushed 5mo ago), licensed MIT. It adds 14 tokens to every session and 386 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Nix Packaging compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| Nix Packagingbreakds/claude.bds | Skill | 2 | 5mo ago | MIT | A | 14 | Claude Code |
| imagegenopenai/codex | Skill | 134k | today | Apache-2.0 | A | 113 | Codex |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | today | MIT | A | 200 | Claude Code, Codex |
| playwright-climicrosoft/playwright | Skill | 99k | today | Apache-2.0 | A | 19 | Claude Code |
| systematic-debuggingobra/superpowers | Skill | 314k | 4d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |
| chat-pet-sprite-creationmicrosoft/vscode | Skill | 195k | today | MIT | A | 53 | Claude Code, Codex |