c4-model SKILL.md skillA
c4-model from mryll/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add mryll/skills/c4-model@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- mryll/skills
- Path
skills/c4-model/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Aug 20, 2026
- Size
- 10,465 bytes
- Repository stars
- 9
- License
- MIT
Create or review C4 model architecture documentation (official c4model.com notation) as diagrams-as-code in Markdown — C4-PlantUML where the target renders it (GitLab.com does; verify Self-Managed instances), Mermaid flowchart/sequence conventions otherwise. Use whenever the user wants to visualize or document the architecture of a system or codebase — even if they never say "C4" — for requests like "diagram this service", "document the architecture…
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 Architecture Documentation Generate C4 model architecture documentation as diagrams-as-code embedded in Markdown — in the selected notation — following the official guidance at c4model.com. The point of C4 is a small set of precise abstractions and views that stay consistent with each other — most of this skill exists to protect that precision. ## Workflow 1. **Read the repository's conventions first**: documentation language, existing architecture docs and where they live. 2. **Confirm purpose, audience, and scope.** Which views add value for this request? Context + Container is the recommended default set. Never generate every level by default — and if the user asks for one specific view, produce only that one. 3. **Separate current architecture from target architecture.** Mixing them in one view produces an ambiguous model; make two views when both are needed. 4. **Collect evidence before modeling** an existing codebase: read `references/codebase-analysis.md` and follow it. Never invent protocols, ownership, or elements the evidence does not support. …
Read the whole file at its exact version.
How to install
mdr add mryll/skills/c4-model@sha256:5c16e1c9b82c5f66The line at the top of this page pins the label v1.0.0, 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_df4n3w4il56gvync)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 20, 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 (10465 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
mryll/skills · 9 stars · license MIT · pushed 2026-10-16 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_df4n3w4il56gvync GET https://markdownregistry.com/api/v1/resolve?ref=mryll/skills/c4-model GET https://markdownregistry.com/api/v1/blob/5c16e1c9b82c5f66f74a063c4ddca6471d9a96e6d31ad7755cbf9cbb0a349603
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.