Connect to the public hosted server — no installation required. All rendering engines and dependencies are pre-installed.
Connect Diagrams MCP to Claude, Cursor or any other MCP client and it stops being a tab you switch to. Connect to the public hosted server — no installation required. All rendering engines and dependencies are pre-installed. The diagrams mcp mcp server is what makes that connection.
Because this one is hosted, setup is mostly authentication — you point your client at the endpoint and approve access. Nothing runs on your machine, so there is no runtime to keep patched.
The toolset is worth reading before you wire it up, because it tells you what the integration is really for:
Prerequisites — Graphviz is required for the default local/in-process rendering mode. Mermaid CLI and PlantUML are optional — install them only if you need thoseDiscovery — The Discovery tool exposed by this serverRendering — The Rendering tool exposed by this serverConfiguration is passed through the environment: RENDERER_HOST, FASTMCP_HOST, DIAGRAMS_RENDERER_URL, BASE_URL. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.
Graphviz is required for the default local/in-process rendering mode. Mermaid CLI and PlantUML are optional — install them only if you need those specific rendering engines locally. | Dependency | Required for | Install | |---|---|---| | Graphviz | render_diagram (cloud architecture) | brew install graphviz | | Mermaid CLI
Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Diagrams MCP's toolset — Prerequisites, Discovery, Rendering — is a fair guide to whether it matches your workflow. It is maintained by byteoverdev; worth a glance at recent repository activity before you build anything load-bearing on it.
SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.
| Tool | What it does |
|---|---|
| Prerequisites | Graphviz is required for the default local/in-process rendering mode. Mermaid CLI and PlantUML are optional — install them only if you need those specific rendering engines locally. |
| Discovery | The Discovery tool exposed by this server. |
| Rendering | The Rendering tool exposed by this server. |
{
"mcpServers": {
"diagrams-mcp": {
"url": "https://diagrams-mcp-production.up.railway.app/mcp"
}
}
}Configuration as documented by the project. Restart the client after saving.
Graphviz is required for the default local/in-process rendering mode. Mermaid CLI and PlantUML are optional — install them only if you need those specific rendering engines locally. | Dependency | Required for | Install | |---|---|---| | Graphviz | render_diagram (cloud architecture) | brew install graphviz | | Mermaid CLI
| Variable | Description | Required |
|---|---|---|
| RENDERER_HOST | Endpoint or connection string the server talks to. | Optional |
| FASTMCP_HOST | Endpoint or connection string the server talks to. | Optional |
| DIAGRAMS_RENDERER_URL | Endpoint or connection string the server talks to. | Yes |
| BASE_URL | Endpoint or connection string the server talks to. | Yes |
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