c4-model SKILL.md skillA
c4-model from ulises-jeremias/agent-toolkit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ulises-jeremias/agent-toolkit/c4-model@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ulises-jeremias/agent-toolkit
- Path
plugins/agent-toolkit-complete/.github/skills/c4-model/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0, committed Aug 31, 2026
- Size
- 2,352 bytes
- Repository stars
- 19
- License
- MIT
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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 1. **Select level:** Context (system + actors) → Container (apps/data stores) → Component (modules) → Code (classes, optional). 2. **Render via Mermaid** (C4-inspired): `flowchart TD` with `subgraph` for boundaries, e.g.: ```mermaid flowchart TD …
Read the whole file at its exact version.
How to install
mdr add ulises-jeremias/agent-toolkit/c4-model@sha256:65b2d4c2f03c1d19The line at the top of this page pins the label v1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_6frdwwdbkm7p2fy6)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 31, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2352 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
ulises-jeremias/agent-toolkit · 19 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6frdwwdbkm7p2fy6 GET https://markdownregistry.com/api/v1/resolve?ref=ulises-jeremias/agent-toolkit/c4-model GET https://markdownregistry.com/api/v1/blob/65b2d4c2f03c1d198cc2237cd058ef745bc06247bb6858d83ebf5a3d07862df6
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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