How do I install the Sac C4 skill?

Run npx skillmds@latest add spillwavesolutions/sac-c4 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Sac C4 safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Sac C4?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Sac C4 free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Sac C4?

spillwavesolutions (@spillwavesolutions) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Sac C4

Name: Sac C4
Author: spillwavesolutions

C4 model integration for the architecture second brain. Map System/Person/ SoftwareContainer/Component/Code, generate L1–L4 Mermaid views, import Structurizr DSL, and avoid Docker vs C4 Container confusion.

spillwavesolutions 3c1946c 1.2 KB Updated Sep 17, 2026

Web & Frontend

Install

Press C to copy

$ npx skillmds@latest add spillwavesolutions/sac-c4

Installs into ~/.claude/skills (or .claude/skills inside a project). Restart Claude Code to pick it up.

Download SKILL.md

＋ Add to collection

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Trust & safety

Audits pending

Not yet audited · commit 3c1946c

Works with: Claude Code Claude.ai OpenAI Codex +

File contents

SAC × C4 model

Critical naming

C4 Container = SoftwareContainer (or Service/WebApp/Database stand-ins)
Docker/OCI = ContainerImage — different concept

Commands

# Inventory how the bundle maps to C4 abstractions
python3 "${CLAUDE_PLUGIN_ROOT}/scripts/sac_c4.py" --bundle knowledge --inventory

# Generate L1–L4 diagram concepts + Structurizr DSL export
python3 "${CLAUDE_PLUGIN_ROOT}/scripts/sac_c4.py" --bundle knowledge --generate --system "My System"

# Print DSL only
python3 "${CLAUDE_PLUGIN_ROOT}/scripts/sac_c4.py" --bundle knowledge --dsl

# Scan existing Structurizr workspaces
python3 "${CLAUDE_PLUGIN_ROOT}/scripts/sac_scan_structurizr.py" --root . --json

When designing

L1 — who uses the system; external systems
L2 — where does the new app/service/DB sit as a SoftwareContainer?
L3 — components inside that container
L4 — modules/classes when coding

Deep doc: docs/c4-integration.md.

spillwavesolutions/system-architecture-capture/tree/main/skills/sac-c4 commit 3c1946c4e4

Frequently asked questions

npx skillmds@latest add spillwavesolutions/sac-c4