LabscoMCP early access ↗
ByteOverDevMCP SERVER

Diagrams MCP Server

Cloud architecture diagrams, flowcharts and UML rendered to images, with node discovery so the model picks real service classes instead of guessing.

by ByteOverDev ↗Diagrams & ChartsCommunity

LABSCO SUMMARY

The discovery tools are what stop the diagram being wrong.

Cloud diagram libraries fail with models for a specific reason — the node classes and import paths are long and easy to hallucinate — and this server solves that by making the catalogue searchable before the render call. Having a hosted endpoint that needs no Graphviz, Java or Mermaid CLI on your machine removes the other usual obstacle.

What it is

A diagram server backed by three rendering engines — mingrammer/diagrams for cloud architecture, Mermaid for flowcharts and sequence diagrams, and PlantUML for UML. The discovery tools are what make it work with a model: rather than hoping the right import path is remembered, the model can list providers, browse services and search nodes by keyword before it writes any diagram code.

What you get

  • Render: render_diagram runs a mingrammer/diagrams Python script in a sandboxed subprocess and returns a PNG, render_mermaid renders a Mermaid definition, render_plantuml renders a PlantUML one
  • Discover before you draw: list_providers, list_services, list_nodes with import paths, and search_nodes for keyword search across every provider
  • Cross-cloud equivalence: find_equivalent maps a node to its counterpart on another provider, and list_categories lists all 30 infrastructure role categories with their mapped nodes
  • Reference material as MCP resources — diagrams://reference/diagram, diagrams://reference/edge, diagrams://reference/cluster, diagrams://reference/mermaid and diagrams://reference/plantuml

Requirements

Nothing — no account, no key. The simplest path is the hosted endpoint at https://diagrams-mcp-production.up.railway.app/mcp, which has every render dependency pre-installed and needs no local setup. Running it yourself: the package is diagrams-mcp-server (version 0.3.0), launched with uvx diagrams-mcp-server over stdio, and local rendering needs Graphviz for render_diagram, the Mermaid CLI for render_mermaid, and Java plus plantuml.jar for render_plantuml. A split mode exists for hosting, where DIAGRAMS_RENDERER_MODE=remote and DIAGRAMS_RENDERER_URL point a slim facade at a separate renderer service.

Setup effort

One command — claude mcp add --transport http diagrams-mcp https://diagrams-mcp-production.up.railway.app/mcp

See installation options