What is plantuml-mcp-server CLAUDE.md?

Project instructions for developing and operating a PlantUML MCP server. PlantUML is a text-based language for creating diagrams, and MCP lets coding agents call the server’s tools.

Use it to build, run, test, develop, or configure the server for Claude Code, including tests with sample PlantUML and C4 diagrams.

It collects the repository’s build, test, setup, and run commands in one place, reducing setup mistakes.

How sysam68/plantuml-mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to sysam68/plantuml-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/sysam68/plantuml-mcp-server/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/sysam68/plantuml-mcp-server

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/sysam68/plantuml-mcp-server/claude-md/github.svg)](https://agentmods.dev/instructions/sysam68/plantuml-mcp-server/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/sysam68/plantuml-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/sysam68/plantuml-mcp-server/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/sysam68/plantuml-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/sysam68/plantuml-mcp-server/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 729 This file is loaded in full into every session.

When invoked 729 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00729	$0.00729
Opus 5.5	$0.00292	$0.00292
Sonnet 5.5	$0.00146	$0.00146
Haiku 4.5	$0.00073	$0.00073

Measured 2mo ago against content hash ba79de991529, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

plantuml-mcp-server CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 59 lines

How it starts

The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Common Development Commands

Building and Running

npm run build - Compile TypeScript to JavaScript in the dist/ directory
npm run dev - Start TypeScript compiler in watch mode for development
npm start - Run the compiled server from dist/plantuml-mcp-server.js
make build - Clean and build the project (preferred)
make run - Build and run the server with proper setup
make dev - Run TypeScript in watch mode using Makefile

Testing

make test-mcp - Test using mcptools CLI with sample PlantUML diagrams (comprehensive test including C4 diagrams)
make test - Test server functionality with background process

Setup and Installation

make install - Install npm dependencies with Node.js version check
make setup - Full setup including install, build, and Claude Code configuration
make setup-claude - Show Claude Code MCP configuration instructions

Project Architecture

Single-File MCP Server

This is a Model Context Protocol (MCP) server that provides PlantUML diagram generation capabilities. The project follows a single-file architecture pattern with all core logic in src/plantuml-mcp-server.ts:22-216.

Main Components:

src/plantuml-mcp-server.ts - Complete MCP server implementation with PlantUML capabilities
dist/ - Compiled JavaScript output directory (TypeScript target: ES2022, module: ESNext)
Makefile - Comprehensive build and development workflow management
package.json - Configured as ESM module with bin entry for npx support

MCP Tools Implementation

The server implements three MCP tools via the PlantUMLMCPServer class:

generate_plantuml_diagram (src/plantuml-mcp-server.ts:93-144)
- Generates PlantUML diagrams and returns embeddable URLs
- Supports SVG/PNG formats
- Validates server accessibility with fetch requests
- Returns markdown embed code

Read the full file on GitHub · 59 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 59 lines · 729 tokens per session scan A ba79de991529

Subscribe to this mod's changes

plantuml-mcp-server CLAUDE.md is an instructions file published in the GitHub repository sysam68/plantuml-mcp-server (0 stars, last pushed 18d ago), licensed MIT. It adds 729 tokens to every session, about $0.0029 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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plantuml-mcp-server: Instructions file for Claude Code