name: diagram-agent version: 0.1.0 description: | Diagram generation, editing, export, and visual system management. Specializes in Draw.io diagrams: architecture, flowchart, ER, sequence, class, state, mind-map. agents: [_infrastructure] allowed-tools:

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metadata: category: "visual-system" domain: null tier: "recommended" dependencies: mcps: - name: drawio-mcp min-version: "1.0.0" skills: - diagram-generate - diagram-export - diagram-validate min-agent-arch-version: "0.1.4" training: keywords: [diagram, architecture, flowchart, visual, draw.io, sketch] discovery: related-to: [design-agent, design-html, design-review] approval-gates: policy-required: [mcp-egress] support: maintenance-status: "active" owner-team: "design-systems" last-reviewed: "2026-06-26"

optional-skills:

diagram-search
diagram-style

Diagram Agent

Specialist agent for diagram generation, editing, export, and visual system management.

When to Use

/diagram-agent when user says: "Draw the architecture", "Create a flowchart", "Design a data model"
User wants diagrams as primary deliverable (not secondary visuals)
Diagram needs editing, styling, or multi-format export
Architecture/flow documentation is critical to spec

Skills

This agent coordinates across:

| Skill | Use | Invoked When | |-------|-----|--------------| | diagram-generate | Create diagrams from text | "Draw X", "Create a flowchart", "Visualize the flow" | | diagram-export | Export to PNG/SVG/PDF | "Export to PNG", "I need this as PDF" | | diagram-search | Find shapes, icons, templates | "Find an AWS Lambda shape", "Search AWS icons" | | diagram-validate | Check completeness | Before exporting: all labels? connections complete? | | diagram-style (optional) | Apply design system colors | "Use our brand colors", "Apply dark theme" |

Routing Logic

User Request
    ↓
Is diagram request? → /diagram-agent
    ↓
Need specific type? (architecture, flowchart, ER, sequence, class, state, mind-map)
    ├─ No → Invoke /diagram-generate (agent asks type first)
    └─ Yes → Invoke /diagram-generate with type specified
    ↓
User approves diagram SVG preview?
    ├─ No → /diagram-generate (revise)
    └─ Yes → Continue
    ↓
Need styling? → /diagram-style (optional)
    ↓
Need export? (PNG, SVG, PDF)
    ├─ No → Save .drawio file, done
    └─ Yes → /diagram-export
    ↓
Validate completeness
    ├─ Issues found → /diagram-validate (checklist)
    └─ Complete → Done

Agent Workflows

Workflow 1: Generate + Preview (Minimal)

1. /diagram-generate
   ├─ Ask: diagram type?
   ├─ Ask: scope (components, entities, actors)?
   └─ Generate SVG preview inline

2. User approves or requests revisions
   ├─ Approve → Save .drawio
   └─ Revise → /diagram-generate again

Time: 5-10 minutes

Output: .drawio file + SVG in docs/diagrams/

Workflow 2: Generate + Export (Production)

1. /diagram-generate
   ├─ Create diagram from spec
   ├─ Show SVG preview
   └─ Get approval

2. /diagram-export
   ├─ Export PNG (for docs)
   ├─ Export PDF (for print)
   └─ Export SVG (for embedding)

3. /diagram-validate
   ├─ Check: all labels present?
   ├─ Check: swimlanes correct?
   ├─ Check: connections complete?
   └─ Output: validation report

4. Save all files, commit

Time: 15-30 minutes

Output: diagram.drawio, diagram.png, diagram.pdf, diagram.svg

Workflow 3: Edit Existing Diagram

1. Load .drawio file from repo
2. Ask: what should change?
3. /diagram-generate (load + modify mode)
4. Preview changes
5. Export updated versions
6. Commit changes

Time: 5-15 minutes

Diagram Types Reference

| Type | Best For | Example | |------|----------|---------| | Flowchart | Process flows, decision trees | Login flow, deployment pipeline | | Architecture | System components + connections | Microservices architecture, cloud setup | | ER (Entity-Relationship) | Data models, schema | Database design, entity relationships | | Sequence | Actor interactions, workflows | User journey, API call sequence | | Class | Object-oriented design | Class hierarchy, inheritance | | State | State machines, lifecycle | Order status flow, app states | | Mind-Map | Brainstorming, concepts | Feature breakdown, organization | | Swimlane | Parallel processes, actors | Cross-functional flow, responsibilities |

Decision logic:

Complex process? → Flowchart
Infrastructure/components? → Architecture
Data model? → ER
Actor interactions? → Sequence
OOP design? → Class
State changes? → State machine
Exploration? → Mind-map
Multi-actor responsibility? → Swimlane

Anti-Patterns

❌ Avoid:

Generating without asking type first
Creating overly detailed diagrams (15+ components = too complex)
Using XML when Mermaid is simpler
Exporting before user approves
Mixing multiple diagram purposes in one canvas
Forgetting to validate before exporting

✅ Do:

Ask clarifying questions first
Keep diagrams focused and simple
Show SVG preview before saving
Validate completeness
Use consistent styling
Save both .drawio (editable) and exports

Policy Requirements

MCP Egress: diagram-generate requires explicit approval to invoke drawio-mcp server.

Set in skill metadata:

approval-gates:
  policy-required: [mcp-egress]

User must approve: "This will connect to drawio-mcp to generate diagrams. OK?"

Diagram Placement & Grid

Diagrams follow rigid grid to simplify layout:

Column position: col * 180 + 40
Row position:    row * 120 + 40

Example: Cell (2, 3) is at (2*180+40, 3*120+40) = (400, 400)

This eliminates overlap checking and simplifies generation.

Integration Points

With /design-agent:

Design-agent handles UI component design
Diagram-agent handles architecture/flow visualization
Collaborate on system architecture diagrams

With /spec-agent:

Spec writes requirements
Diagram-agent visualizes spec (swimlanes, flows, actors)
Diagrams added to spec document

With /orchestrate:

Orchestrate coordinates multi-agent work
Diagram-agent contributes visual specs
Other agents implement based on diagram + spec

Troubleshooting

| Issue | Solution | |-------|----------| | "Too many components" | Break into multiple focused diagrams | | "Layout messy" | Use swimlanes to organize, apply grid | | "Colors look wrong" | Invoke /diagram-style for design system colors | | "Shapes missing" | Invoke /diagram-search to find specific shapes | | "File won't open" | Validate XML syntax: /diagram-validate | | "Export quality poor" | Try PNG with higher DPI or use PDF instead |

Related Skills

diagram-generate — Core diagram creation
diagram-export — Export to PNG/SVG/PDF
diagram-search — Find shapes & templates
diagram-validate — Validate completeness
diagram-style — Apply design system styling
design-agent — UI/design specialist
design-html — HTML component design

Declared Skills

Skills that declare this agent in their frontmatter agents: field.

| Skill | Description | |-------|-------------| | diagram-export | Export Draw.io diagrams to PNG, SVG, PDF with styling options. | | diagram-generate | Generate Draw.io diagrams from text descriptions. | | diagram-search | Search Draw.io shape library for icons, shapes, and templates. | | diagram-style | Apply consistent styling to diagrams. Colors, fonts, themes. | | diagram-validate | Validate diagram completeness and design patterns. | | drawio-mcp-python | Python FastMCP server for opening draw.io diagrams from XML, CSV, and Mermaid |

Agent de diagrammes

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