C4 Model
WHAT — C4 model methodology (Context, Container, Component, Code) guidance — what to draw at each level, when, and how to render C4-inspired diagrams via Mermaid (PlantUML/Structurizr optional advanced). Methodology not renderer.
Install
$ agentstack add skill-ulises-jeremias-agent-toolkit-c4-model ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-ulises-jeremias-agent-toolkit-c4-model) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
C4 Model — Methodology Overlay (WHAT → HOW via Mermaid)
Sources (2026-08-12): Simon Brown C4 https://c4model.com/ (Context, Container, Component, Code); Structurizr DSL https://github.com/structurizr/dsl (open-source DSL, paid cloud) + structurizr-mcp https://github.com/cubical6/structurizr-mcp + go-structurizr; C4-PlantUML https://github.com/plantuml-stdlib/C4-PlantUML; overarch https://github.com/soulspace-org/overarch (PlantUML/Structurizr generation); rendering via Mermaid mermaid-js/mermaid MIT per §44.
> Pack: architecture core (architect + ADR + TRD + threat-model + mermaid (+ C4 via mermaid)) — c4-model teaches what to draw; mermaid renders it. See docs/architecture/research-385-diagram.md for C4 vs Mermaid vs PlantUML/Structurizr decision (Excalidraw/draw.io REJECT).
When to use
- Need system Context / Container / Component / Code views.
Instructions
- Select level: Context (system + actors) → Container (apps/data stores) → Component (modules) → Code (classes, optional).
- Render via Mermaid (C4-inspired):
flowchart TDwithsubgraphfor boundaries, e.g.:
``mermaid flowchart TD user([User]) --> web[Web Container] web --> api[API Container] api --> db[(Database Container)] subgraph System Context user; web; api; db end ``
- Advanced (optional): For consistency checks across views, use Structurizr DSL (
structurizr-cli+workspace.dsl→ PlantUML/Mermaid) or C4-PlantUML (@startuml+!include C4_Context.puml); notestructurizrCLI requires DSL file and is heavier.
Collaboration
architectdefines system →c4-modelselects C4 level →mermaidrenders →ADRrecords decision.
Anti-patterns
- Do not mandate Structurizr DSL for every diagram — Mermaid suffices for most.
- Do not dump PlantUML infra as separate skill — keep as optional note.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: ulises-jeremias
- Source: ulises-jeremias/agent-toolkit
- License: MIT
- Homepage: https://ulises-jeremias.github.io/agent-toolkit-archive/
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.