plantuml
CLI/Python “Claude Code skill” that helps create PlantUML diagrams from text, convert .puml/.md content into PNG/SVG images, validate PlantUML syntax, and support extracting/embedding diagrams from markdown workflows.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Local execution via plantuml.jar and Graphviz; README does not discuss threat model for handling untrusted .puml/.md content (e.g., file path traversal, command injection in any wrapper scripts). No secrets/auth flows described. Ensure you do not render untrusted PlantUML/Graphviz inputs in shared environments without reviewing the scripts and runtime context.
⚡ Reliability
Best When
You want a local, scriptable way to generate and render PlantUML diagrams (especially from markdown) and include images in docs/Confluence-like systems.
Avoid When
You cannot install Java/plantuml.jar or Graphviz (Graphviz is recommended for most UML rendering).
Use Cases
- • Generate UML/non-UML diagrams (sequence/class/activity/deployment/ER/Gantt/mindmap, etc.) from descriptions
- • Convert .puml files to PNG/SVG for documentation
- • Process markdown files to extract embedded/link .puml blocks and produce updated markdown with image links
- • Validate PlantUML syntax in CI/CD without rendering images
- • Convert source-code-oriented architectures into PlantUML-friendly diagram outputs (via skill guidance)
Not For
- • A hosted diagram rendering API (everything described is local/CLI + plantuml.jar)
- • High-assurance enterprise diagram pipelines without reviewing dependencies and build/runtime hardening
- • Interactive diagram editing in the browser (this is generation/conversion-focused)
Interface
Authentication
No authentication described; tool operates locally and invokes plantuml.jar/Graphviz via scripts/CLI.
Pricing
No pricing information; appears to be an open-source/local utility.
Agent Metadata
Known Gotchas
- ⚠ Requires local Java + plantuml.jar; failures will occur if binaries aren’t present/located or PATH/env is misconfigured
- ⚠ Graphviz is recommended/required for most diagrams (some types may not need it)
- ⚠ Markdown processing supports both embedded puml blocks and linked .puml files; agents should ensure paths/relative links are correct
- ⚠ Multiple scripts are mentioned (process_markdown_puml.py vs legacy extract_and_convert_puml.py); agents should prefer the documented enhanced script
Alternatives
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Scores are editorial opinions as of 2026-03-30.