ClaudSkills / Engineering / code-quality

Designing Deep Modules

Quality score: 70/100 · Category: Engineering · Sub-category: code-quality

type:review

Guides designing, reviewing, and refactoring modules for depth — maximizing functionality hidden behind minimal interfaces. Analyzes module boundaries, identifies shallow modules and classitis, applies deep module heuristics (pull complexity downward, define errors out of existence, design for the common case), and produces refactoring plans. Covers information hiding, leaky abstractions, and abstraction boundaries based on Ousterhout's A Philosophy of Software Design. Use when designing module interfaces, reviewing code for shallow abstractions, refactoring pass-through layers, evaluating API surface area, reducing interface complexity, or applying deep module principles at any scale (functions, classes, packages, services, APIs).

What this skill does

Designing Deep Modules is a production-ready Claude Code skill (quality score 70/100) in the code-quality sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/designing-deep-modules/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when designing module interfaces, reviewing code for shallow abstractions, refactoring pass-through layers, evaluating API surface area, reducing interface complexity, or applying deep module principles at any scale (functions, classes, packages, services, APIs).

Who uses this skill

The Designing Deep Modules skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/designing-deep-modules
curl -L https://claudskills.com/skills/designing-deep-modules/SKILL.md \
  -o ~/.claude/skills/designing-deep-modules/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/designing-deep-modules/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/designing-deep-modules/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\designing-deep-modules\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

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