arc42 is a template for architecture documentation with 12 sections. C4 is a diagram model (Context → Container → Component → Code) that maps directly into arc42's structural sections.
Arc42 C4 is a community-contributed Claude Code skill in the devops sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/arc42-c4/ and loads when your prompt matches the skill's trigger.
The Arc42 C4 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 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/arc42-c4 curl -L https://claudskills.com/skills/arc42-c4/SKILL.md \ -o ~/.claude/skills/arc42-c4/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/arc42-c4/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/arc42-c4/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\arc42-c4\SKILL.md on Windows. See the full install guide for step-by-step instructions.
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.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.