@diagrammo
基本信息
MCP server for rendering DGMO diagrams. Generate sequence diagrams, flowcharts, ER diagrams, C4 architecture, gantt charts, kanban, sitemaps, mind maps, and 30+ other chart types from concise text markup.
使用下面的配置,将此服务器添加到你的 MCP 客户端。
{
"mcpServers": {
"dgmo": {
"command": "npx",
"args": [
"-y",
"@diagrammo/dgmo-mcp"
]
}
}
}Render DGMO markup to SVG or PNG. Returns SVG text or base64 PNG image. When format is "png", also saves the image to a temp file and returns the path. For DGMO syntax call get_language_reference (e.g. color a label with a trailing color name: "Sales red").
Generate a shareable diagrammo.app URL for a DGMO diagram.
Open a DGMO diagram in the Diagrammo desktop app (macOS only). Falls back to browser preview if the app is not installed. Pass `filePath` to open a saved .dgmo file directly — the app opens THAT file, so in-app edits autosave back to it (one editable source of truth, live re-render). This is the preferred path when the app is installed: write the .dgmo source first, then open it here. Omit `filePath` for an ephemeral diagram (sends a deep link; the app creates its own copy).
Check whether the Diagrammo desktop app is installed (macOS). Call this ONCE before choosing how to show a diagram. If installed, the preferred output is to save the .dgmo source and open that file live in the app (open_in_app with filePath) — do NOT default to an online share URL. If not installed, fall back to the online share URL.
List all supported DGMO chart types with descriptions.
Get the DGMO language reference documentation. Optionally filter by chart type.
Render one or more DGMO diagrams and open an HTML preview in the browser. Supports theme toggle and optional source display. For DGMO syntax call get_language_reference (e.g. color a label with a trailing color name: "Sales red").
Generate a polished HTML report with multiple DGMO diagrams, table of contents, and optional source blocks. Opens in browser by default. For DGMO syntax call get_language_reference (e.g. color a label with a trailing color name: "Sales red").
Validate DGMO markup without rendering. Returns structured parse errors and warnings. Much faster than render_diagram — use this to check syntax before rendering.
Suggest the best DGMO chart type for a user's plain-English diagram request. ALWAYS CALL THIS FIRST when creating a new diagram — it prevents guessing and is the authoritative selection mechanism. Returns one of two shapes: (1) a confident pick (high/medium) with the top match's syntax, or (2) an '⚠️ ASK THE USER' directive when the choice is ambiguous or nothing matched. On an ASK-THE-USER directive, do NOT pick a type yourself — present the listed candidates to the user and wait for their choice before generating.
Get example DGMO diagrams for a chart type. Returns real-world examples from the gallery that demonstrate syntax patterns. Use these as few-shot references when generating new diagrams.
Diagrammo (dgmo) is an MCP server that renders 35+ diagram types — sequence, flowchart, ER, C4, gantt, kanban, mindmap, infrastructure, sitemap, journey map, tech radar, and more — to SVG or PNG from concise text markup. It outputs renders locally with no API key required and can produce shareable online.diagrammo.app URLs or open diagrams in the local Diagrammo desktop app.
Install by adding the dgmo entry to your Claude Desktop or Claude Code configuration using npx -y @diagrammo/dgmo-mcp. After restarting the client, the tools appear automatically. Use tools like render_diagram, share_diagram, open_in_app, list_chart_types, get_language_reference, preview_diagram, and generate_report.
online.diagrammo.app URLsdgmo offers beautiful defaults with 10 built-in palettes, supports more diagram types (ER schemas, C4, kanban, infrastructure, tech radar, etc.), generates persistent share links, and requires no API key — all rendering is local.
The server runs via `npx`, so Node.js and npm must be installed on your machine. No additional dependencies or accounts are needed.
All rendering happens locally on your machine. Your diagram text and data never leave your computer. Share links encode the diagram markup in the URL but are hosted on diagrammo.app.
The MCP server communicates over standard stdio transport. No API key, authentication, or external services are required for rendering.
The README does not describe any specific limits. All 35+ chart types are fully supported locally. The server provides a `get_language_reference` tool to fetch full syntax documentation.
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