doc-architecture
Generate architecture documentation using arc42 or C4 model. Use for creating system context, container, and component diagrams with narrative.
What this skill does
# Generate Architecture Documentation
Create comprehensive architecture documentation for a system or component.
## Process
### 1. Parse Arguments
Extract from user input:
- **Subject**: System/component to document (required)
- **Format**: `arc42`, `c4`, or `both` (default: `c4`)
- **Level**: For C4 - `context`, `container`, or `component` (default: `container`)
### 2. Analyze System
Explore the codebase to understand:
1. **System boundaries**: What is in scope?
2. **External dependencies**: What systems does it interact with?
3. **Internal structure**: How is it organized?
4. **Technology stack**: What technologies are used?
5. **Key flows**: What are the important scenarios?
Use file exploration to gather information:
- Solution/project files for structure
- Configuration files for dependencies
- Entry points for architecture clues
- Existing documentation
### 3. Generate Documentation
Based on the format argument:
**If format = c4:**
1. Load the `c4-documentation` skill
2. Generate diagrams at the requested level:
- **context**: System with users and external systems
- **container**: Internal applications and data stores
- **component**: Internal structure of a container
3. Include narrative description with each diagram
**If format = arc42:**
1. Load the `arc42-documentation` skill
2. Generate relevant sections:
- Introduction and Goals
- Architecture Constraints
- System Scope and Context
- Solution Strategy
- Building Block View
- Runtime View (key scenarios)
- Deployment View
- Cross-cutting Concepts
**If format = both:**
1. Generate arc42 document
2. Embed C4 diagrams in appropriate sections
### 4. Output Structure
Create documentation file(s):
```text
For C4:
docs/architecture/
└── {subject}-c4-{level}.md
For arc42:
docs/architecture/
└── {subject}-arc42.md
For both:
docs/architecture/
├── {subject}-architecture.md # arc42 with embedded C4
└── diagrams/
├── context.mmd
├── container.mmd
└── component.mmd
```
### 5. Include in Output
Every generated document should include:
1. **Header with metadata**
- Title
- Last updated date
- Author (if known)
- Version
2. **Diagrams** (Mermaid format)
- Properly formatted C4 diagrams
- Legend if needed
3. **Narrative**
- Context and purpose
- Key decisions and rationale
- Technology choices
- Trade-offs acknowledged
4. **References**
- Links to related docs
- External resources
- ADRs if applicable
## Example Invocations
```text
/doc-architecture "order service"
→ Generates C4 container diagram for order service
/doc-architecture "payment gateway" format=arc42
→ Generates full arc42 documentation
/doc-architecture "api gateway" format=c4 level=component
→ Generates C4 component diagram
/doc-architecture "entire system" format=both level=context
→ Generates arc42 with embedded C4 context diagram
```
## Quality Criteria
Generated documentation must:
- [ ] Accurately reflect the system structure
- [ ] Use consistent terminology
- [ ] Include valid Mermaid/PlantUML syntax
- [ ] Explain the "why" not just the "what"
- [ ] Be actionable for readers
- [ ] Follow project documentation conventions
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