ClaudSkills / Engineering / architecture

Creating C4 Diagrams

Q: What is a Claude Code skill and how does the Creating C4 Diagrams 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. Creating C4 Diagrams is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Engineering · Sub-category: architecture · Last updated: 2026-05-21

type:review

Creates, reviews, and interprets C4 software architecture diagrams (System Context, Container, Component, Dynamic, Deployment). Produces Structurizr DSL or Mermaid C4 diagram code following C4 model best practices. Use when the requested output is explicitly C4, when reviewing existing C4 diagrams for correctness and anti-patterns, when generating Structurizr DSL workspaces, when producing Mermaid C4 diagrams for READMEs, or when using C4 diagrams as context for design decisions, code generation, risk analysis, or onboarding.

About this skill (catalog notes)

Creating C4 Diagrams includes at least one code block. The SKILL.md runs to about 1,010 words, in the catalog's typical mid-range.

Original author: msewell
Indexed lastmod: 2026-05-21
Catalog position: Engineering · architecture
Indexed related skills: 10

How Creating C4 Diagrams fits the catalog

Creating C4 Diagrams sits in the Engineering category under the architecture sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

This skill is C4-specific: model architecture using C4 abstractions and notation (not generic box-and-arrow diagrams).

What this skill does

Creating C4 Diagrams is a community-contributed Claude Code skill in the architecture sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/creating-c4-diagrams/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the requested output is explicitly C4, when reviewing existing C4 diagrams for correctness and anti-patterns, when generating Structurizr DSL workspaces, when producing Mermaid C4 diagrams for READMEs, or when using C4 diagrams as context for design decisions, code generation, risk analysis, or onboarding.

Who uses this skill

The Creating C4 Diagrams Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 117,000+ 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/creating-c4-diagrams
curl -L https://claudskills.com/skills/creating-c4-diagrams/SKILL.md \
  -o ~/.claude/skills/creating-c4-diagrams/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/creating-c4-diagrams/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/creating-c4-diagrams/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\creating-c4-diagrams\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 Creating C4 Diagrams Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/creating-c4-diagrams/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Creating C4 Diagrams 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 Creating C4 Diagrams skill?

Use Creating C4 Diagrams when your Claude Code task falls under the Engineering category — specifically in the architecture 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 Creating C4 Diagrams" or describe the task and let Claude pick). Browse related skills at /category/engineering/.

What is a Claude Code skill and how does the Creating C4 Diagrams 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. Creating C4 Diagrams is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/msewell/agent-stuff/blob/HEAD/skills/creating-c4-diagrams/SKILL.md
Author: msewell

Cite this skill

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

APA

msewell. (2026). Creating C4 Diagrams [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/creating-c4-diagrams/

BibTeX

@misc{creating-c4-diagrams-2026,
  author    = {msewell},
  title     = {Creating C4 Diagrams [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/creating-c4-diagrams/}
}

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