UML MCP Server

MCP server for generating UML diagrams programmatically, typically using PlantUML or similar tools. Enables AI agents to create UML diagrams from text descriptions — class diagrams, sequence diagrams, activity diagrams, component diagrams — and render them as images for documentation and architecture visualization.

Evaluated Mar 06, 2026 (0d ago) vcurrent

Homepage ↗ Repo ↗ Developer Tools uml diagrams plantuml mcp-server architecture documentation visualization

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

100

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Architecture diagrams are design IP. Use local PlantUML rendering. External server option sends design data to plantuml.com.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

A developer or architect wants AI agents to automatically generate UML diagrams from code analysis, requirements descriptions, or system documentation — reducing manual diagram maintenance.

Avoid When

You need interactive visual editing or non-UML diagram formats. Mermaid-based MCPs are often simpler alternatives for basic diagramming.

Use Cases

• Generating UML class and sequence diagrams from architecture agents
• Creating system design diagrams from technical documentation agents
• Visualizing API flows and component relationships for software design agents
• Automating diagram generation for documentation pipelines

Not For

• Interactive diagram editing (programmatic generation only)
• Non-UML diagramming (use Mermaid or Excalidraw MCPs for other formats)
• Complex enterprise architecture with thousands of components

Interface

REST API

GraphQL

gRPC

MCP Server

Yes ↗

SDK

Webhooks

Authentication

Methods: none

OAuth: No Scopes: No

No authentication for local PlantUML rendering. External PlantUML server optional.

Pricing

Model: free

Free tier: Yes

Requires CC: No

PlantUML is free open source (GPL). MCP server is free.

Agent Metadata

Pagination

none

Idempotent

Full

Retry Guidance

Not documented

Known Gotchas

⚠ PlantUML requires Java or uses external server — verify dependencies before deployment
⚠ UML syntax validation is strict — agents need accurate PlantUML syntax knowledge
⚠ External PlantUML server option sends diagram source to plantuml.com — use local rendering for sensitive designs
⚠ Diagram complexity has size limits — very large diagrams may fail to render

Alternatives

mermaid-mcp-server excalidraw-mcp diagrams-mcp

Full Evaluation Report

Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for UML MCP Server.

$99

API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-03-06.