Modular Decomposition

Q: What is a Claude Code skill and how does the Modular Decomposition skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Modular Decomposition is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Product · Sub-category: roadmap · Last updated: 2026-05-21

Runs a sequenced monolith-to-modular pipeline that sizes and inventories components, finds shared domain duplication, addresses flattening and hierarchy issues, analyzes coupling, then groups components into candidate domain-aligned units, with optional embedded DDD strategic analysis for bounded contexts. Use when asking how to split a monolith, size components before extraction, find duplicated domain logic, clean up module hierarchy, measure coupling between modules, or group components into services. Do NOT use for phased extraction roadmaps or prioritization without the prior analysis steps (use decomposition-planning-roadmap after this pipeline), end-to-end legacy migration strategy writeups (use legacy-migration-planner), pure infrastructure capacity sizing, or when you only need DDD without the structural pipeline (install domain-analysis standalone).

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

This skill runs the Patterns 1–5 analysis pipeline before service extraction. Each pattern is plain markdown under references/; load the file for that step and execute it against the user’s codebase.

What this skill does

Modular Decomposition is a community-contributed Claude Code skill in the roadmap sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/modular-decomposition/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when asking how to split a monolith, size components before extraction, find duplicated domain logic, clean up module hierarchy, measure coupling between modules, or group components into services. Do NOT use for phased extraction roadmaps or prioritization without the prior analysis steps (use decomposition-planning-roadmap after this pipeline), end-to-end legacy migration strategy writeups (use legacy-migration-planner), pure infrastructure capacity sizing, or when you only need DDD without the structural pipeline (install domain-analysis standalone).

Who uses this skill

The Modular Decomposition Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 146,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/modular-decomposition
curl -L https://claudskills.com/skills/modular-decomposition/SKILL.md \
  -o ~/.claude/skills/modular-decomposition/SKILL.md

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

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

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

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.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Modular Decomposition Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/modular-decomposition/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Modular Decomposition skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Modular Decomposition skill?

Use Modular Decomposition when your Claude Code task falls under the Product category — specifically in the roadmap area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Modular Decomposition" or describe the task and let Claude pick). Browse related skills at /category/product/.

What is a Claude Code skill and how does the Modular Decomposition skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Modular Decomposition is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/tech-leads-club/agent-skills/blob/HEAD/packages/skills-catalog/skills/(architecture)/modular-decomposition/SKILL.md
Author: tech-leads-club
Website: https://agent-skills.techleads.club/

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

tech-leads-club. (2026). Modular Decomposition [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/modular-decomposition/

BibTeX

@misc{modular-decomposition-2026,
  author    = {tech-leads-club},
  title     = {Modular Decomposition [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/modular-decomposition/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/modular-decomposition.svg)](https://claudskills.com/skills/modular-decomposition/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-07-06 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/modular-decomposition/#security)

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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