Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add malob/nix-config/plugin install homebrewWrote 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/malob/nix-config/new-cask)<a href="https://agentmods.dev/skills/malob/nix-config/new-cask"><img src="https://agentmods.dev/badge/skills/malob/nix-config/new-cask.svg" alt="Measured on agentmods" 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 | $0.00093 | $0.01698 |
| Opus 5 | $0.00046 | $0.00849 |
| Sonnet 5 | $0.00019 | $0.00340 |
| Haiku 4.5 | $0.00009 | $0.00170 |
Grade A, and why
new-cask scanned grade A with 1 finding 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 8d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
Bash(curl *), How it starts
The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating a New Homebrew Cask
You are orchestrating the creation of a new Homebrew cask. This skill coordinates multiple specialist agents and scripts to complete the workflow.
IMPORTANT: This skill runs in the main conversation context. You will use the Task tool to spawn agents for specialized work.
Input
URL provided: $ARGUMENTS
If no URL was provided, ask the user for:
- The app name, OR
- A download URL (direct link to DMG/ZIP), OR
- The product homepage (you'll find the download link)
Workflow Overview
1. Pre-flight checks → Agent: pre-flight-checker
2. Download & inspect → Agent: app-inspector
3. Livecheck strategy → Agent: livecheck-advisor
4. Write cask file → Agent: cask-writer
5. Testing → Automated tests, install, createzap, uninstall
6. Submit PR → Agent: pr-submitter
Create a task list to track progress through these steps.
Step-by-Step Execution
Step 1: Pre-flight Checks
Before investing time, verify the app is suitable:
Use the Task tool:
- subagent_type: homebrew:pre-flight-checker
- prompt: Check if this app is suitable for homebrew-cask submission.
<include whatever info you have: URL, app name, homepage>
The agent will derive any missing info (app name from URL, homepage via search, etc.) and include it in the output.
Capture from output: App name, homepage, download URL, description - you'll need these for later steps.
Decision point: If the agent returns REJECT, stop and explain why to the user. If CAUTION, inform the user and ask if they want to proceed.
Step 2: Download and Inspect
Download and inspect the app in one step:
Use the Task tool:
- subagent_type: homebrew:app-inspector
- prompt: Download and inspect the app.
Download URL: <url>
Homepage: <homepage>
The agent will download the file, compute the SHA256, extract all metadata, and run Homebrew's generate_cask_token tool to get the canonical token.
Capture from output: Suggested token, SHA256, version, bundle ID, app name, min macOS, auto-update info (framework, appcast URL if found), architecture.
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.
- 8d ago First seen · 222 lines · 93 tokens per session scan A 263e99bf17a3
new-cask is a skill published in the GitHub repository malob/nix-config (462 stars, last pushed yesterday), licensed MIT. It adds 93 tokens to every session and 1,698 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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