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C4 Architecture Documentation · zzafergok | DecimalAI

documentationby zzafergok

C4 Architecture Documentation

zzafergok/c4-architecture

Source zzafergok/skills ↗License Not recorded

Generate architecture documentation using C4 model Mermaid diagrams.

SkillScore70Maintained

Automatic

Coding pack

Last verified 8/6/2026

What it changes

Passed 16 of 23 test cases with the skill, and 15 of 23 without it.

Without skill65%

With skill70%

Checks it passed that the model alone missed

sets c4ShapeInRow parameter
uses C4Context diagram syntax
uses UpdateLayoutConfig directive

and 3 more in the full report

4 fixed12 passed either way4 still failing3 broke

Pass-rate lift: +4 pp
Tokens: +83%
Agent turns: 0%
Response time: -38%

Model gemini-3.6-flashMeasured 8/6/2026v1 · latest is v216 of 23 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

This benchmark measured an earlier version of the skill.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/zzafergok-c4-architecture/SKILL.md https://app.decimal.ai/s/zzafergok-c4-architecture/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add zzafergok-c4-architecture, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/zzafergok-c4-architecture/ and pins it in .decimal/skills.lock

decimalai skills add zzafergok-c4-architecture

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/zzafergok-c4-architecture/SKILL.md https://app.decimal.ai/s/zzafergok-c4-architecture/SKILL.md

Raw file: /s/zzafergok-c4-architecture/SKILL.md ↗ · machine-readable summary at /s/zzafergok-c4-architecture.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 4

Prompt

Our SRE team needs architectural diagrams to set up AWS ECS Fargate clusters and RDS PostgreSQL instances for production deployment. What specific C4 diagram type and output filename should be provided to meet DevOps infrastructure needs?

What was checked, without and with the skill
Checked	Without skill	With skill
recommends C4Deployment diagram	Passed	Passed
specifies output filename c4-deployment.md	Missed	Passed

case-10 · gemini-3.6-flash · 8/6/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md326 linessingle file

C4 Architecture Documentation

Generate software architecture documentation using C4 model diagrams in Mermaid syntax.

Workflow

Understand scope - Determine which C4 level(s) are needed based on audience
Analyze codebase - Explore the system to identify components, containers, and relationships
Generate diagrams - Create Mermaid C4 diagrams at appropriate abstraction levels
Document - Write diagrams to markdown files with explanatory context

C4 Diagram Levels

Select the appropriate level based on the documentation need:

Level	Diagram Type	Audience	Shows	When to Create
1	C4Context	Everyone	System + external actors	Always (required)
2	C4Container	Technical	Apps, databases, services	Always (required)
3	C4Component	Developers	Internal components	Only if adds value
4	C4Deployment	DevOps	Infrastructure nodes	For production systems
-	C4Dynamic	Technical	Request flows (numbered)	For complex workflows

Key Insight: "Context + Container diagrams are sufficient for most software development teams." Only create Component/Code diagrams when they genuinely add value.

Quick Start Examples

System Context (Level 1)

C4Context
  title System Context - Workout Tracker


  Person(user, "User", "Tracks workouts and exercises")
  System(app, "Workout Tracker", "Vue PWA for tracking strength and CrossFit workouts")
  System_Ext(browser, "Web Browser", "Stores data in IndexedDB")


  Rel(user, app, "Uses")

Track record

Benchmark

16 / 23

test cases passed, vs 15 / 23 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 9/26/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

zzafergok / skills

02-software-architecture/c4-architecture/SKILL.md

View on GitHub ↗

Imported 9/26/2026Version v2

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

C4 Architecture Documentation

Workflow

C4 Diagram Levels

Quick Start Examples

System Context (Level 1)

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills