The PlantUML server integrates PlantUML diagram generation capabilities directly into Claude Desktop and Claude Code using the Model Context Protocol (MCP). It empowers Claude instances to create various diagrams like sequence, class, and architecture diagrams, and provides utilities for encoding and decoding PlantUML for URL sharing. A key feature is its intelligent error handling prompt, which guides Claude to detect, parse, and automatically fix common PlantUML syntax errors, enhancing the reliability and user-friendliness of diagram generation.