mcp-mermaid

Why we included this project

Most LLM assistants can describe a flowchart but struggle to produce one that actually renders. mcp-mermaid fixes that by exposing the full Mermaid syntax through a Model Context Protocol server, so a model can request a diagram and get back validated output as base64, SVG, raw Mermaid text, or a PNG saved to disk. The validation matters more than it sounds: when the model emits malformed syntax, the server flags it and the model can correct itself over several rounds, which is exactly where naive diagram generation tends to fall apart. It plugs into Claude, VS Code, Cline, and other MCP-capable clients with a short npx command, and the theme and background color options let the model produce styled output instead of a bare default. A focused tool that adds one capability to an existing agent setup rather than demanding a new platform.