feat: Add diagram-generation plugin for Excalidraw diagrams #151
Description
Summary
Add a new diagram-generation plugin for creating professional Excalidraw diagrams for architecture and design documentation.
Components
| Type | Name | Description |
|---|---|---|
| Agent | diagram-pro |
Excalidraw diagram expert (sonnet model) |
| Command | diagram-generate |
Generate new diagrams from descriptions |
| Command | diagram-fix |
Correct layout/bindings in existing diagrams |
| Skill | excalidraw-diagram |
Comprehensive diagram generation knowledge |
Features
- 5 diagram types: System/Component, Workflow/State, Sequence, ERD, Deployment
- Library-first approach: 70+ pre-built components across 16 categories
- Semantic color palettes: Architecture, workflow, AWS, K8s themes
- Presentation-ready: 1920x1080 frames with hand-drawn aesthetic
- Correction workflow: Fix layout, bindings, and colors in existing diagrams
Skill Structure (Progressive Disclosure)
skills/excalidraw-diagram/
├── SKILL.md # Core instructions (~270 lines)
├── assets/ # Config and palettes
├── library/ # 70+ component library with index
├── patterns/ # Diagram type templates
├── primitives/ # Basic shapes and connectors
└── reference/ # Detailed templates (load on demand)
Use Cases
- Architecture documentation for systems and services
- Workflow and state machine visualization
- Sequence diagrams for API interactions
- Entity-relationship diagrams for data models
- Deployment diagrams for infrastructure
Checklist
- Plugin directory created
- Agent with proper frontmatter (name, description, model)
- Commands with clear triggers
- Skill with YAML frontmatter and "Use when" clause
- Registered in marketplace.json
- Documentation updates (plugins.md, agents.md, agent-skills.md)