flowgraf-mcp

Create and edit clean, editable architecture diagrams from your AI agent.

Flowgraf turns a description of a system into a clean, auto-laid-out architecture diagram — and hands back a link to a live canvas you can keep editing (by chat or by hand). This package is the stdio proxy for MCP clients that speak stdio; it forwards to Flowgraf's hosted MCP endpoint. No API key, no LLM cost to you — your agent authors the diagram, Flowgraf lays it out and renders it.

Tools

Tool	What it does
create_diagram	Turn a graph (nodes + edges + groups) into a diagram → returns an SVG, a Mermaid string, and a /d/<id> canvas link
edit_diagram	Apply operations to an existing diagram (e.g. insert a cache between two nodes) — it re-wires and re-lays-out automatically
get_diagram	Fetch a diagram's current graph + version

Install

Claude Code

Recommended — the hosted remote endpoint (no local process):

claude mcp add --transport http flowgraf https://flowgraf.in/api/mcp

Or via this stdio proxy:

claude mcp add flowgraf npx flowgraf-mcp

Cursor / Windsurf (stdio)

Add to your MCP config (~/.cursor/mcp.json for Cursor):

{
  "mcpServers": {
    "flowgraf": {
      "command": "npx",
      "args": ["-y", "flowgraf-mcp"]
    }
  }
}

Anything else

npx -y flowgraf-mcp

The proxy talks the Model Context Protocol over stdio and forwards to the hosted API.

Configuration

By default the proxy targets Flowgraf's hosted endpoint. Override it (e.g. for local development) with an environment variable:

Variable	Meaning
FLOWGRAF_MCP_URL	Full endpoint URL, e.g. http://localhost:3000/api/mcp
FLOWGRAF_MCP_BASE_URL	Base URL; /api/mcp is appended

Example

"Create an architecture diagram: a user hits an API gateway in a VPC, which talks to a Postgres database." → create_diagram returns an SVG and a link like https://flowgraf.in/d/abc123. Open it to edit on the canvas.

"Add a Redis cache between the API and the database." → edit_diagram inserts the cache and re-routes the edge automatically — no manual cleanup.

Links

• Website: https://flowgraf.in
• MCP endpoint: https://flowgraf.in/api/mcp

License

MIT