Draw.io Diagram Skill

Create professional, editable diagram files in draw.io's native XML format.

Output Format

Draw.io files are XML with this structure:

<mxfile host="app.diagrams.net" modified="DATE" agent="Claude" version="21.0.0" type="device">
  <diagram name="DIAGRAM_NAME" id="UNIQUE_ID">
    <mxGraphModel dx="1200" dy="800" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="1100" pageHeight="850" math="0" shadow="0">
      <root>
        <mxCell id="0" />
        <mxCell id="1" parent="0" />
        <!-- All diagram elements go here -->
      </root>
    </mxGraphModel>
  </diagram>
</mxfile>

Core Element Types

Basic Shapes

<!-- Rectangle -->
<mxCell id="unique-id" value="Label Text" style="rounded=0;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
  <mxGeometry x="100" y="100" width="120" height="60" as="geometry" />
</mxCell>

<!-- Rounded Rectangle -->
<mxCell id="unique-id" value="Label" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;" vertex="1" parent="1">
  <mxGeometry x="100" y="100" width="120" height="60" as="geometry" />
</mxCell>

<!-- Cylinder (Database) -->
<mxCell id="unique-id" value="Database" style="shape=cylinder3;whiteSpace=wrap;html=1;boundedLbl=1;backgroundOutline=1;size=15;fillColor=#f8cecc;strokeColor=#b85450;" vertex="1" parent="1">
  <mxGeometry x="100" y="100" width="80" height="80" as="geometry" />
</mxCell>

<!-- Ellipse -->
<mxCell id="unique-id" value="Node" style="ellipse;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;" vertex="1" parent="1">
  <mxGeometry x="100" y="100" width="80" height="80" as="geometry" />
</mxCell>

Containers & Groups

<!-- Swimlane (Container with Header) -->
<mxCell id="unique-id" value="Section Title" style="swimlane;fontStyle=1;align=center;verticalAlign=top;childLayout=stackLayout;horizontal=1;startSize=30;fillColor=#f5f5f5;strokeColor=#666666;fontColor=#333333;" vertex="1" parent="1">
  <mxGeometry x="40" y="40" width="200" height="150" as="geometry" />
</mxCell>

<!-- Header Bar (using brand primary color) -->
<mxCell id="unique-id" value="" style="rounded=0;whiteSpace=wrap;html=1;fillColor=#0066CC;strokeColor=#0066CC;" vertex="1" parent="1">
  <mxGeometry x="40" y="40" width="400" height="40" as="geometry" />
</mxCell>

Connectors & Arrows

<!-- Basic Arrow -->
<mxCell id="unique-id" value="" style="endArrow=classic;html=1;rounded=0;strokeWidth=2;strokeColor=#666666;" edge="1" parent="1" source="source-id" target="target-id">
  <mxGeometry relative="1" as="geometry" />
</mxCell>

<!-- Bidirectional Arrow -->
<mxCell id="unique-id" value="" style="endArrow=classic;startArrow=classic;html=1;rounded=0;strokeWidth=2;" edge="1" parent="1">
  <mxGeometry relative="1" as="geometry">
    <mxPoint x="200" y="200" as="sourcePoint" />
    <mxPoint x="400" y="200" as="targetPoint" />
  </mxGeometry>
</mxCell>

<!-- Flex Arrow (Block Arrow) -->
<mxCell id="unique-id" value="" style="shape=flexArrow;endArrow=classic;html=1;fillColor=#FFB800;strokeColor=#cc9400;width=20;endSize=8;" edge="1" parent="1">
  <mxGeometry relative="1" as="geometry">
    <mxPoint x="200" y="200" as="sourcePoint" />
    <mxPoint x="400" y="200" as="targetPoint" />
  </mxGeometry>
</mxCell>

<!-- Dashed Line -->
<mxCell id="unique-id" value="" style="endArrow=classic;html=1;dashed=1;dashPattern=8 8;strokeColor=#999999;" edge="1" parent="1">
  <mxGeometry relative="1" as="geometry">
    <mxPoint x="200" y="200" as="sourcePoint" />
    <mxPoint x="400" y="200" as="targetPoint" />
  </mxGeometry>
</mxCell>

Text Elements

<!-- Plain Text -->
<mxCell id="unique-id" value="Label Text" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;fontSize=12;" vertex="1" parent="1">
  <mxGeometry x="100" y="100" width="100" height="30" as="geometry" />
</mxCell>

<!-- Bold Title -->
<mxCell id="unique-id" value="Title" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;fontSize=18;fontStyle=1;fontColor=#333333;" vertex="1" parent="1">
  <mxGeometry x="100" y="20" width="300" height="40" as="geometry" />
</mxCell>

<!-- Multi-line Text (use &#xa; for newlines) -->
<mxCell id="unique-id" value="Line 1&#xa;Line 2&#xa;Line 3" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=top;whiteSpace=wrap;rounded=0;fontSize=10;" vertex="1" parent="1">
  <mxGeometry x="100" y="100" width="150" height="60" as="geometry" />
</mxCell>

Common Style Properties

Colors (use hex codes)

Property	Purpose	Example
`fillColor`	Background	`fillColor=#dae8fc`
`strokeColor`	Border	`strokeColor=#6c8ebf`
`fontColor`	Text	`fontColor=#333333`

Standard Color Palette

Blue:    fillColor=#dae8fc;strokeColor=#6c8ebf
Green:   fillColor=#d5e8d4;strokeColor=#82b366
Yellow:  fillColor=#fff2cc;strokeColor=#d6b656
Orange:  fillColor=#ffe6cc;strokeColor=#d79b00
Red:     fillColor=#f8cecc;strokeColor=#b85450
Purple:  fillColor=#e1d5e7;strokeColor=#9673a6
Grey:    fillColor=#f5f5f5;strokeColor=#666666

Typography

Property	Values	Example
`fontSize`	Number	`fontSize=12`
`fontStyle`	0=normal, 1=bold, 2=italic, 3=bold+italic	`fontStyle=1`
`align`	left, center, right	`align=center`
`verticalAlign`	top, middle, bottom	`verticalAlign=middle`

Borders & Effects

Property	Values	Example
`rounded`	0 or 1	`rounded=1`
`strokeWidth`	Number	`strokeWidth=2`
`dashed`	0 or 1	`dashed=1`
`dashPattern`	Pattern	`dashPattern=8 8`
`shadow`	0 or 1	`shadow=1`

Company Branding (Customisable)

This skill supports company-specific branding. Edit references/branding.md to set your organisation's colours and styles.

Default brand placeholders (replace with your own):

Primary:   fillColor=#0066CC;strokeColor=#0052a3;fontColor=#FFFFFF
Secondary: fillColor=#FFB800;strokeColor=#cc9400;fontColor=#333333
Dark:      fillColor=#1a1a2e;strokeColor=#1a1a2e;fontColor=#FFFFFF
Light BG:  fillColor=#f0f4f8;strokeColor=#0066CC

See references/branding.md for full customisation instructions.

Diagram Patterns

Architecture Diagram Layout

Title bar at top (full width, branded color)
Main sections as swimlanes or rounded containers
Components as rounded rectangles inside sections
Databases as cylinders
External systems on left/right edges
Arrows showing data/control flow
Legend in corner explaining colors/symbols
Footer with metadata

Layered Architecture (Top to Bottom)

┌─────────────────────────────────────┐
│           Users / Clients           │  ← Top layer
├─────────────────────────────────────┤
│           API / Interface           │
├─────────────────────────────────────┤
│         Business Logic              │
├─────────────────────────────────────┤
│         Data / Storage              │  ← Bottom layer
└─────────────────────────────────────┘

Left-to-Right Flow

┌──────┐     ┌──────────┐     ┌──────────┐
│Source│ ──► │ Process  │ ──► │  Target  │
└──────┘     └──────────┘     └──────────┘

Best Practices

Unique IDs: Every mxCell needs a unique id attribute
Parent hierarchy: Set parent="1" for top-level elements
Positioning: Use mxGeometry with x, y, width, height
Layering: Elements defined later appear on top
Alignment: Use consistent x/y spacing (grid of 10-20px)
Colors: Use coordinated fill/stroke pairs from the palette
Labels: Keep text concise; use separate text elements for descriptions
Whitespace: Leave margins inside containers (20-40px padding)

Workflow

Determine diagram type and layout pattern
Set page dimensions in mxGraphModel (pageWidth, pageHeight)
Create container structure (swimlanes, groups)
Add components with unique IDs
Add connectors referencing source/target IDs
Add labels and annotations
Add legend if using color coding
Save as .drawio file
Copy to /mnt/user-data/outputs/ and present to user

Cloud Provider Icons (AWS, Azure, GCP)

Draw.io includes built-in shape libraries for major cloud providers. Use official icons for professional architecture diagrams.

AWS Icons (Quick Reference)

AWS uses shape=mxgraph.aws4.resourceIcon with resIcon=mxgraph.aws4.SERVICE:

<mxCell id="lambda-1" value="Lambda" style="sketch=0;outlineConnect=0;fontColor=#232F3E;fillColor=#ED7100;strokeColor=#ffffff;dashed=0;verticalLabelPosition=bottom;verticalAlign=top;align=center;html=1;fontSize=12;fontStyle=0;aspect=fixed;shape=mxgraph.aws4.resourceIcon;resIcon=mxgraph.aws4.lambda;" vertex="1" parent="1">
  <mxGeometry x="100" y="100" width="78" height="78" as="geometry" />
</mxCell>

Common AWS resIcon values:

Compute: ec2, lambda, ecs, eks, fargate
Storage: s3, elastic_block_store, elastic_file_system
Database: rds, dynamodb, aurora, elasticache, redshift
Networking: vpc, cloudfront, route_53, api_gateway, elastic_load_balancing
Security: iam, cognito, secrets_manager, kms, waf

AWS Category Colors:

Compute: #ED7100
Storage: #7AA116
Database: #C925D1
Networking: #8C4FFF
Security: #DD344C

Azure Icons (Quick Reference)

Azure uses image=img/lib/azure2/CATEGORY/SERVICE.svg:

<mxCell id="vm-1" value="VM" style="aspect=fixed;html=1;points=[];align=center;image;fontSize=12;image=img/lib/azure2/compute/Virtual_Machine.svg;verticalLabelPosition=bottom;verticalAlign=top;" vertex="1" parent="1">
  <mxGeometry x="100" y="100" width="68" height="68" as="geometry" />
</mxCell>

Common Azure image paths:

compute/Virtual_Machine.svg, compute/Function_Apps.svg
containers/Kubernetes_Services.svg
storage/Storage_Accounts.svg, storage/Blob_Storage.svg
databases/SQL_Database.svg, databases/Azure_Cosmos_DB.svg
networking/Virtual_Networks.svg, networking/Load_Balancers.svg
security/Key_Vaults.svg, identity/Azure_Active_Directory.svg

AWS Group Containers

<!-- VPC -->
<mxCell id="vpc" value="VPC" style="sketch=0;outlineConnect=0;gradientColor=none;html=1;whiteSpace=wrap;fontSize=12;fontStyle=0;shape=mxgraph.aws4.group;grIcon=mxgraph.aws4.group_vpc;strokeColor=#8C4FFF;fillColor=none;verticalAlign=top;align=left;spacingLeft=30;dashed=0;" vertex="1" parent="1">
  <mxGeometry x="40" y="40" width="400" height="300" as="geometry" />
</mxCell>

<!-- Public Subnet -->
grIcon=mxgraph.aws4.group_public_subnet;strokeColor=#7AA116;fillColor=#E9F3E6

<!-- Private Subnet -->
grIcon=mxgraph.aws4.group_private_subnet;strokeColor=#00A4A6;fillColor=#E6F6F7

References

For advanced patterns and complete icon lists, see:

references/architecture-patterns.md - Common architecture diagram layouts
references/style-guide.md - Extended styling options and icon placement
references/cloud-icons.md - Complete AWS, Azure, GCP icon reference
references/branding.md - Company branding customisation guide

drawioSafety 100Repository

Package Files

Draw.io Diagram Skill

Output Format

Core Element Types

Basic Shapes

Containers & Groups

Connectors & Arrows

Text Elements

Common Style Properties

Colors (use hex codes)

Standard Color Palette

Typography

Borders & Effects

Company Branding (Customisable)

Diagram Patterns

Architecture Diagram Layout

Layered Architecture (Top to Bottom)

Left-to-Right Flow

Best Practices

Workflow

Cloud Provider Icons (AWS, Azure, GCP)

AWS Icons (Quick Reference)

Azure Icons (Quick Reference)

AWS Group Containers

References

Install

AI Quality Score

Metadata

Tags

drawioSafety 100Repository ShareFavorite skill

Package Files

Draw.io Diagram Skill

Output Format

Core Element Types

Basic Shapes

Containers & Groups

Connectors & Arrows

Text Elements

Common Style Properties

Colors (use hex codes)

Standard Color Palette

Typography

Borders & Effects

Company Branding (Customisable)

Diagram Patterns

Architecture Diagram Layout

Layered Architecture (Top to Bottom)

Left-to-Right Flow

Best Practices

Workflow

Cloud Provider Icons (AWS, Azure, GCP)

AWS Icons (Quick Reference)

Azure Icons (Quick Reference)

AWS Group Containers

References

Install

AI Quality Score

Metadata

Tags

drawioSafety 100Repository