From duet
Create diagrams and visualizations using Mermaid.js v11 syntax. Use when generating flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, user journeys, timelines, or any of 24+ diagram types. Supports CLI rendering to SVG/PNG/PDF, theming, and configuration. Essential for inline documentation diagrams that render natively on GitHub.
npx claudepluginhub tslateman/claude-plugins --plugin duetThis skill uses the workspace's default tool permissions.
Create text-based diagrams using Mermaid.js v11 declarative syntax. Mermaid is the only diagram format that renders natively in GitHub markdown -- no exported images to commit.
Guides strict Test-Driven Development (TDD): write failing tests first for features, bugfixes, refactors before any production code. Enforces red-green-refactor cycle.
Guides systematic root cause investigation for bugs, test failures, unexpected behavior, performance issues, and build failures before proposing fixes.
Guides A/B test setup with mandatory gates for hypothesis validation, metrics definition, sample size calculation, and execution readiness checks.
Create text-based diagrams using Mermaid.js v11 declarative syntax. Mermaid is the only diagram format that renders natively in GitHub markdown -- no exported images to commit.
Basic Diagram Structure:
{diagram-type}
{diagram-content}
Common Diagram Types:
flowchart - Process flows, decision treessequenceDiagram - Actor interactions, API flowsclassDiagram - OOP structures, data modelsstateDiagram - State machines, workflowserDiagram - Database relationshipsgantt - Project timelinesjourney - User experience flowsWARNING:
references/diagram-types.mdcovers all 24+ diagram types with full syntax. Load only when you need a specific type's syntax.
Inline Markdown Code Blocks:
```mermaid
flowchart TD
A[Start] --> B{Decision}
B -->|Yes| C[Action]
B -->|No| D[End]
```
Configuration via Frontmatter:
```mermaid
---
theme: dark
---
flowchart LR
A --> B
```
Comments: Use %% prefix for single-line comments.
Follow these to avoid parse errors:
end keywordConvert .mmd files to images:
# Installation
npm install -g @mermaid-js/mermaid-cli
# Basic conversion
mmdc -i diagram.mmd -o diagram.svg
# With theme and background
mmdc -i input.mmd -o output.png -t dark -b transparent
# Custom styling
mmdc -i diagram.mmd --cssFile style.css -o output.svg
See references/cli-usage.md for Docker, batch processing, and advanced workflows.
Common Options:
theme: "default", "dark", "forest", "neutral", "base"look: "classic", "handDrawn"fontFamily: Custom font specificationsecurityLevel: "strict", "loose", "antiscript"See references/configuration.md for complete config options, theming, and customization.
Load references/examples.md for:
references/diagram-types.md - Syntax for all 24+ diagram typesreferences/configuration.md - Config, theming, accessibilityreferences/cli-usage.md - CLI commands and workflowsreferences/integration.md - JavaScript API and embeddingreferences/examples.md - Practical patterns and use cases/excalidraw - For architecture diagrams where hand-drawn aesthetic and drag-and-drop editing matter/design - Design thinking applies to diagram composition and layout/prose - Diagram labels benefit from the same concision rules as prose