Excalidraw Diagram Generator

A skill for generating Excalidraw-format diagrams from natural language descriptions. This skill helps create visual representations of processes, systems, relationships, and ideas without manual drawing.

When to Use This Skill

Use this skill when users request:

• "Create a diagram showing..."
• "Make a flowchart for..."
• "Visualize the process of..."
• "Draw the system architecture of..."
• "Generate a mind map about..."
• "Create an Excalidraw file for..."
• "Show the relationship between..."
• "Diagram the workflow of..."

Supported Diagram Types

• Flowcharts: Sequential processes, workflows, decision trees
• Relationship Diagrams: Entity relationships, system components, dependencies
• Mind Maps: Concept hierarchies, brainstorming results, topic organization
• Architecture Diagrams: System design, module interactions, data flow
• Data Flow Diagrams (DFD): Data flow visualization, data transformation processes
• Business Flow (Swimlane): Cross-functional workflows, actor-based process flows
• Class Diagrams: Object-oriented design, class structures and relationships
• Sequence Diagrams: Object interactions over time, message flows
• ER Diagrams: Database entity relationships, data models

Step-by-Step Workflow

Step 1: Understand the Request

Analyze the user's description to determine:

• Diagram type (flowchart, relationship, mind map, architecture)
• Key elements (entities, steps, concepts)
• Relationships (flow, connections, hierarchy)
• Complexity (number of elements)

Step 2: Choose the Appropriate Diagram Type

Step 3: Extract Structured Information

For Flowcharts:

• List of sequential steps
• Decision points (if any)
• Start and end points

For Relationship Diagrams:

• Entities/nodes (name + optional description)
• Relationships between entities (from -> to, with label)

For Mind Maps:

• Central topic
• Main branches (3-6 recommended)
• Sub-topics for each branch (optional)

For Data Flow Diagrams (DFD):

• Data sources and destinations (external entities)
• Processes (data transformations)
• Data stores (databases, files)
• Data flows (arrows showing data movement from left-to-right or from top-left to bottom-right)
• Important: Do not represent process order, only data flow

For Business Flow (Swimlane):

• Actors/roles (departments, systems, people) - displayed as header columns
• Process lanes (vertical lanes under each actor)
• Process boxes (activities within each lane)
• Flow arrows (connecting process boxes, including cross-lane handoffs)

For Class Diagrams:

• Classes with names
• Attributes with visibility (+, -, #)
• Methods with visibility and parameters
• Relationships: inheritance (solid line + white triangle), implementation (dashed line + white triangle), association (solid line), dependency (dashed line), aggregation (solid line + white diamond), composition (solid line + filled diamond)
• Multiplicity notations (1, 0..1, 1..*, *)

For Sequence Diagrams:

• Objects/actors (arranged horizontally at top)
• Lifelines (vertical lines from each object)
• Messages (horizontal arrows between lifelines)
• Synchronous messages (solid arrow), asynchronous messages (dashed arrow)
• Return values (dashed arrows)
• Activation boxes (rectangles on lifelines during execution)
• Time flows from top to bottom

For ER Diagrams:

• Entities (rectangles with entity names)
• Attributes (listed inside entities)
• Primary keys (underlined or marked with PK)
• Foreign keys (marked with FK)
• Relationships (lines connecting entities)
• Cardinality: 1:1 (one-to-one), 1:N (one-to-many), N:M (many-to-many)
• Junction/associative entities for many-to-many relationships (dashed rectangles)

Step 4: Generate the Excalidraw JSON

Create the .excalidraw file with appropriate elements:

Available element types:

• rectangle: Boxes for entities, steps, concepts
• ellipse: Alternative shapes for emphasis
• diamond: Decision points
• arrow: Directional connections
• text: Labels and annotations

Key properties to set:

• Position: x, y coordinates
• Size: width, height
• Style: strokeColor, backgroundColor, fillStyle
• Font: fontFamily: 5 (Excalifont - required for all text elements)
• Text: Embedded text for labels
• Connections: points array for arrows

Important: All text elements must use fontFamily: 5 (Excalifont) for consistent visual appearance.

Step 5: Format the Output

Structure the complete Excalidraw file:

{
  "type": "excalidraw",
  "version": 2,
  "source": "https://excalidraw.com",
  "elements": [
    // Array of diagram elements
  ],
  "appState": {
    "viewBackgroundColor": "#ffffff",
    "gridSize": 20
  },
  "files": {}
}

Step 6: Save and Provide Instructions

• Save as <descriptive-name>.excalidraw
• Inform user how to open:
  • Visit https://excalidraw.com
  • Click "Open" or drag-and-drop the file
  • Or use Excalidraw VS Code extension

Best Practices

Element Count Guidelines

Layout Tips

• Start positions: Center important elements, use consistent spacing
• Spacing:
  • Horizontal gap: 200-300px between elements
  • Vertical gap: 100-150px between rows
• Colors: Use consistent color scheme
  • Primary elements: Light blue (#a5d8ff)
  • Secondary elements: Light green (#b2f2bb)
  • Important/Central: Yellow (#ffd43b)
  • Alerts/Warnings: Light red (#ffc9c9)
• Text sizing: 16-24px for readability
• Font: Always use fontFamily: 5 (Excalifont) for all text elements
• Arrow style: Use straight arrows for simple flows, curved for complex relationships

Complexity Management

If user request has too many elements:

1. Suggest breaking into multiple diagrams
2. Focus on main elements first
3. Offer to create detailed sub-diagrams

Example response: "Your request includes 15 components. For clarity, I recommend:

1. High-level architecture diagram (6 main components)
2. Detailed diagram for each subsystem

Would you like me to start with the high-level view?"

Example Prompts and Responses

Example 1: Simple Flowchart

User: "Create a flowchart for user registration"

Agent generates:

• Extract steps: "Enter email" -> "Verify email" -> "Set password" -> "Complete"
• Create flowchart with 4 rectangles + 3 arrows
• Save as user-registration-flow.excalidraw

Example 2: Relationship Diagram

User: "Diagram the relationship between User, Post, and Comment entities"

Agent generates:

• Entities: User, Post, Comment
• Relationships: User -> Post ("creates"), User -> Comment ("writes"), Post -> Comment ("contains")
• Save as user-content-relationships.excalidraw

Example 3: Mind Map

User: "Mind map about machine learning concepts"

Agent generates:

• Center: "Machine Learning"
• Branches: Supervised Learning, Unsupervised Learning, Reinforcement Learning, Deep Learning
• Sub-topics under each branch
• Save as machine-learning-mindmap.excalidraw

Troubleshooting

Advanced Techniques

Grid Layout (for Relationship Diagrams)

const columns = Math.ceil(Math.sqrt(entityCount));
const x = startX + (index % columns) * horizontalGap;
const y = startY + Math.floor(index / columns) * verticalGap;

Radial Layout (for Mind Maps)

const angle = (2 * Math.PI * index) / branchCount;
const x = centerX + radius * Math.cos(angle);
const y = centerY + radius * Math.sin(angle);

Auto-generated IDs

Use timestamp + random string for unique IDs:

const id = Date.now().toString(36) + Math.random().toString(36).substr(2);

Output Format

Always provide:

• Complete .excalidraw JSON file
• Summary of what was created
• Element count
• Instructions for opening/editing

Example summary:

Created: user-workflow.excalidraw
Type: Flowchart
Elements: 7 rectangles, 6 arrows, 1 title text
Total: 14 elements

To view:
1. Visit https://excalidraw.com
2. Drag and drop user-workflow.excalidraw
3. Or use File -> Open in Excalidraw VS Code extension

Validation Checklist

Before delivering the diagram:

• All elements have unique IDs
• Coordinates prevent overlapping
• Text is readable (font size 16+)
• All text elements use fontFamily: 5 (Excalifont)
• Arrows connect logically
• Colors follow consistent scheme
• File is valid JSON
• Element count is reasonable (<20 for clarity)