cargo-coupling: Skill for Claude Code

.claude/skills/review/SKILL.md

review is a skill for Claude Code from nwiizo/cargo-coupling. It costs 27 tokens per session (799 once invoked), scanned A, original, MIT.

A review workflow for finding hidden dependencies between software modules and design problems caused by them. It combines automated coupling measurements with a human-style review of the code's meaning.

In plain words
What is it for?
Use it to review modularity, classify parts of a codebase by responsibility and change rate, compare coupling across revisions, or inspect coupling against a baseline branch.
Why use it?
It exposes relationships and design risks that ordinary code review or simple metrics may miss, including changes that spread unnecessarily across modules.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

This is nwiizo/cargo-coupling's own configuration. It tells Claude Code how to work on cargo-coupling itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything cargo-coupling configures →

Reuse

Borrowing it

Nothing to install: this file belongs to nwiizo/cargo-coupling. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/nwiizo/cargo-coupling/main/.claude/skills/review/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/nwiizo/cargo-coupling

Made for: Claude Code.

Wrote 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.

agentmods badge for review

README.md
[![agentmods](https://agentmods.dev/badge/skills/nwiizo/cargo-coupling/review.svg)](https://agentmods.dev/skills/nwiizo/cargo-coupling/review)
Your own site
<a href="https://agentmods.dev/skills/nwiizo/cargo-coupling/review"><img src="https://agentmods.dev/badge/skills/nwiizo/cargo-coupling/review.svg" alt="Measured on agentmods" height="20"></a>
Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 799 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00027 $0.00799
Opus 5 $0.00014 $0.00400
Sonnet 5 $0.00005 $0.00160
Haiku 4.5 $0.00003 $0.00080

Measured 5d ago against content hash 2d1466c5e6fc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

review 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 5d 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.

.claude/skills/review/SKILL.md · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Modularity Review

Structured review workflow inspired by Khononov's modularity analysis. Combines cargo-coupling's automated metrics with semantic code understanding.

Workflow

Step 1: Automated Analysis

cargo run -- coupling --ai $ARGUMENTS

Parse the output to understand current coupling state. AI output includes the full blind-spot manifest; treat "no issues" as "no observed issues", not as proof that no coupling risk exists.

Optional release/PR context:

# Time-series trend across git revisions
cargo run -- coupling --history $ARGUMENTS

# Diff current issues against the target branch
cargo run -- coupling --baseline main $ARGUMENTS

Step 2: Subdomain Classification

Read .coupling.toml for existing subdomain config. If absent, examine the codebase and suggest classification:

  • Core: Modules providing competitive advantage (frequently evolving)
  • Supporting: Stable business logic (CRUD, ETL, data pipelines)
  • Generic: Solved problems (auth, logging, config, web framework)

The [subdomains] section informs essential-vs-accidental volatility. Core modules are expected to change; supporting/generic modules with high churn can indicate Accidental Volatility.

Step 3: Map Integrations

For each detected coupling, evaluate across 3 dimensions:

  1. Strength: What knowledge is shared? Is it implicit or explicit?
  2. Distance: Code structure + team boundaries + runtime coupling
  3. Volatility: Business-driven (subdomain) + git-history-based

Look beyond explicit code dependencies for implicit coupling:

  • Duplicated business logic across modules
  • Shared magic constants/strings
  • Assumptions about data format or ordering (connascence of meaning)
  • Co-changing files without explicit dependencies

Automated issue signals to preserve in the review:

  • Hidden Coupling: strong temporal co-change without an AST dependency
  • Accidental Volatility: supporting/generic subdomain code with suspicious churn

Read the full file on GitHub · 114 lines

Changes

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.

  1. 5d ago First seen · 114 lines · 27 tokens per session scan A 2d1466c5e6fc

Subscribe to this mod's changes

review is a skill published in the GitHub repository nwiizo/cargo-coupling (96 stars, last pushed yesterday), licensed MIT. It adds 27 tokens to every session and 799 once invoked, about $0.0001 per session on Opus 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 2026-09-01.

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