Plantuml Mcp Server
About
MCP server that provides PlantUML diagram generation capabilities
Details
- Author
- infobip
- Downloads
- 237
- Categories
- Developer Tools, Other
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Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Plantuml Mcp ServerCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
{
"mcpServers": {
"plantuml": {
"command": "npx",
"args": [
"plantuml-mcp-server"
],
"env": {
"PLANTUML_SERVER_URL": "https://www.plantuml.com/plantuml"
}
}
}
}
generate_plantuml_diagram
Generate a PlantUML diagram with automatic syntax validation and error reporting for auto-fix workflows. Returns embeddable image URLs for valid diagrams or structured error details for invalid syntax that can be automatically corrected. Optionally saves the diagram to a local file.
encode_plantuml
Encode PlantUML code for URL usage
decode_plantuml
Decode encoded PlantUML string back to PlantUML code
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"plantuml mcp server": {
"plantuml": {
"command": "npx",
"args": [
"plantuml-mcp-server"
],
"env": {
"PLANTUML_SERVER_URL": "https://www.plantuml.com/plantuml"
}
}
}
}
}McpServers
{
"plantuml": {
"command": "npx",
"args": [
"plantuml-mcp-server"
],
"env": {
"PLANTUML_SERVER_URL": "https://www.plantuml.com/plantuml"
}
}
}This prompt provides Claude instances with comprehensive instructions on how to:
- Detect PlantUML syntax errors using native server validation
- Implement intelligent auto-fix workflows for common syntax issues
- Parse structured error responses and apply appropriate corrections
- Handle validation failures gracefully with retry logic
The prompt enables Claude to automatically detect and fix common PlantUML errors like missing tags, invalid arrow syntax, typos in keywords, and missing quotes, making PlantUML diagram generation more reliable and user-friendly.
# Using default PlantUML server claude mcp add plantuml --scope user --env PLANTUML_SERVER_URL=https://www.plantuml.com/plantuml -- npx plantuml-mcp-server
Add this to your Claude Desktop MCP configuration (~/Library/Application Support/Claude/claude_desktop_config.jsonon macOS):
{ "mcpServers": { "plantuml": { "command": "npx", "args": ["plantuml-mcp-server"], "env": { "PLANTUML_SERVER_URL": "https://www.plantuml.com/plantuml" } } } }
To use your own PlantUML server, change thePLANTUML_SERVER_URLenvironment variable.
Then restart Claude Desktop/Code to activate the MCP server.
- Generate PlantUML diagramsand get embeddable SVG/PNG URLs
- Create sequence diagrams, class diagrams, architecture diagrams
- Use advanced PlantUML featureslike!includedirectives and external libraries
- Encode/decode PlantUMLfor URL sharing
- Save diagrams locallywith secure path restrictions
Thegenerate_plantuml_diagramtool supports saving diagrams to local files via theoutput_pathparameter.
Security:By default, files can only be saved within the current working directory. Only.svgand.pngextensions are allowed.
To allow additional directories, set thePLANTUML_ALLOWED_DIRSenvironment variable:
# Allow specific directories (colon-separated) PLANTUML_ALLOWED_DIRS=/home/user/diagrams:/tmp/output # Allow any directory (use with caution) PLANTUML_ALLOWED_DIRS=*
> add c4 diagram for this project in readme 'C4 diagram for plantuml-mcp-server' section
Sequence diagram for plantuml-mcp-server
> add sequence diagram in readme in architecture section
> show me basic oauth2 flow png, open it in browser
# Clone and setup git clone https://github.com/mzagar/plantuml-mcp-server.git cd plantuml-mcp-server make setup
# Show all available commands make help # Build and run all tests make clean build test-all
MIT License - seeLICENSEfile for details.
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