How do I install the composer MCP server?

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "composer": { "command": "npx", "args": ["-y", "composer"] } }

What does composer do?

Give your AI coding agent an architecture canvas to design and evolve diagrams.

Is the composer MCP server free to use?

Yes. composer is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

How do I install the composer MCP server?

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "composer": { "command": "npx", "args": ["-y", "composer"] } }

What does composer do?

Give your AI coding agent an architecture canvas to design and evolve diagrams.

Is the composer MCP server free to use?

Yes. composer is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

Composer MCP Server

Composer demo

Composer logo Composer MCP Server

Give your AI coding agent an architecture canvas.
Design, visualize, and evolve software architecture diagrams - right from your IDE.

Composer is a visual system design tool that lets AI coding agents create and modify interactive architecture diagrams through MCP (Model Context Protocol). Your agent gets tools to add services, databases, queues, and connections, and you get a live canvas at usecomposer.com that updates in real-time.

Code

Your IDE  <-->  MCP Server (this package)  <-->  Composer API  <-->  Your Diagram

Getting Started

Connect your IDE

Claude Code:

Terminal

claude mcp add --transport http composer https://mcp.usecomposer.com

Cursor — create .cursor/mcp.json in your project root:

config.json

{
  "mcpServers": {
    "composer": {
      "type": "http",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

Your browser will open for authorization on first use.

Claude Code

Terminal

claude mcp add --transport http composer https://mcp.usecomposer.com

Cursor

Create .cursor/mcp.json in your project root:

config.json

{
  "mcpServers": {
    "composer": {
      "type": "http",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

Codex

bash

codex mcp add composer -- npx -y @usecomposer/mcp --stdio

VS Code (Copilot Chat)

Create .vscode/mcp.json in your project root:

config.json

{
  "servers": {
    "composer": {
      "type": "http",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

VS Code (Cline)

Open Cline sidebar > Settings (gear icon) > MCP Servers > Add Remote Server:

config.json

{
  "mcpServers": {
    "composer": {
      "type": "http",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

VS Code (Continue)

Add to .continue/config.yaml:

yaml

mcpServers:
  - name: composer
    url: https://mcp.usecomposer.com

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

config.json

{
  "mcpServers": {
    "composer": {
      "serverUrl": "https://mcp.usecomposer.com"
    }
  }
}

Note: Windsurf uses "serverUrl" instead of "url".

OpenCode

Create opencode.json in your project root:

config.json

{
  "mcp": {
    "composer": {
      "type": "remote",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

Tools

Diagram Management

Tool	Description
`list_diagrams`	List all your diagrams. Call this first to find which diagram to work on
`create_diagram`	Create a new diagram and auto-select it for this session
`select_diagram`	Select which diagram to work on for this session
`rename_diagram`	Rename the currently selected diagram

Note: Call list_diagrams then select_diagram (or create_diagram) before using other tools.

Read

Tool	Description
`get_graph`	Get the full architecture diagram - all nodes and edges
`get_node`	Get details for a single node including connected edges
`search_graph`	Search nodes and edges by keyword
`get_screenshot`	Get a PNG thumbnail of the diagram from the last auto-save

Write

Tool	Description
`upsert_node`	Create or update a node (service, database, queue, etc.)
`upsert_edge`	Create or update a connection between two nodes
`define_api`	Define API endpoints on a backend service node
`delete_element`	Delete a node or edge from the diagram
`link_path`	Link a node to a file or folder in your codebase

Plan & Verify

Tool	Description
`verify_diagram`	Check for issues like missing endpoints or orphaned nodes
`plan_import`	Step-by-step workflow for importing an existing codebase
`get_guide`	Reference guide for node types, protocols, and best practices

Node Types

client · frontend · backend · database · cache · queue · storage · external

Edge Protocols

REST · gRPC · GraphQL · WebSocket · TCP · UDP · async · event · internal

Example Prompts

Once connected, try asking your AI agent:

Prompt	What it does
"Import this codebase into Composer"	Scans your repo and builds the architecture diagram
"Create a new Composer diagram called Backend Architecture"	Creates and auto-selects a new diagram
"Add a Redis cache between the API and the database in Composer"	Adds a new node and edges to the diagram
"Add analytics monitoring to the Composer diagram"	Adds observability nodes and connections
"Update the APIs I defined in Composer"	Refreshes endpoint definitions on backend nodes
"Verify my Composer diagram"	Checks for missing endpoints, orphaned nodes, etc.
"Link each Composer node to its source code"	Associates diagram nodes with file paths

How It Works

Authentication is handled via OAuth 2.1 — your browser opens for a one-time consent flow, and you're connected. Tool calls are proxied to the Composer API at mcp.usecomposer.com. Your diagram data lives on Composer's servers. The MCP server itself is stateless.

Changes made through MCP are immediately visible on the Composer canvas via real-time WebSocket sync.

Development

bash

git clone https://github.com/olivergrabner/composer-mcp
cd composer-mcp
npm install
npm run dev        # Watch mode (rebuilds on change)
npm run build      # Production build

License

MIT

Composer demo

Composer logo Composer MCP Server

Give your AI coding agent an architecture canvas.
Design, visualize, and evolve software architecture diagrams - right from your IDE.

Code

Your IDE  <-->  MCP Server (this package)  <-->  Composer API  <-->  Your Diagram

Getting Started

Connect your IDE

Claude Code:

Terminal

claude mcp add --transport http composer https://mcp.usecomposer.com

Cursor — create .cursor/mcp.json in your project root:

config.json

{
  "mcpServers": {
    "composer": {
      "type": "http",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

Your browser will open for authorization on first use.

Claude Code

Terminal

claude mcp add --transport http composer https://mcp.usecomposer.com

Cursor

Create .cursor/mcp.json in your project root:

config.json

{
  "mcpServers": {
    "composer": {
      "type": "http",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

Codex

bash

codex mcp add composer -- npx -y @usecomposer/mcp --stdio

VS Code (Copilot Chat)

Create .vscode/mcp.json in your project root:

config.json

{
  "servers": {
    "composer": {
      "type": "http",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

VS Code (Cline)

Open Cline sidebar > Settings (gear icon) > MCP Servers > Add Remote Server:

config.json

{
  "mcpServers": {
    "composer": {
      "type": "http",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

VS Code (Continue)

Add to .continue/config.yaml:

yaml

mcpServers:
  - name: composer
    url: https://mcp.usecomposer.com

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

config.json

{
  "mcpServers": {
    "composer": {
      "serverUrl": "https://mcp.usecomposer.com"
    }
  }
}

Note: Windsurf uses "serverUrl" instead of "url".

OpenCode

Create opencode.json in your project root:

config.json

{
  "mcp": {
    "composer": {
      "type": "remote",
      "url": "https://mcp.usecomposer.com"
    }
  }
}

Tools

Diagram Management

Tool	Description
`list_diagrams`	List all your diagrams. Call this first to find which diagram to work on
`create_diagram`	Create a new diagram and auto-select it for this session
`select_diagram`	Select which diagram to work on for this session
`rename_diagram`	Rename the currently selected diagram

Note: Call list_diagrams then select_diagram (or create_diagram) before using other tools.

Read

Tool	Description
`get_graph`	Get the full architecture diagram - all nodes and edges
`get_node`	Get details for a single node including connected edges
`search_graph`	Search nodes and edges by keyword
`get_screenshot`	Get a PNG thumbnail of the diagram from the last auto-save

Write

Tool	Description
`upsert_node`	Create or update a node (service, database, queue, etc.)
`upsert_edge`	Create or update a connection between two nodes
`define_api`	Define API endpoints on a backend service node
`delete_element`	Delete a node or edge from the diagram
`link_path`	Link a node to a file or folder in your codebase

Plan & Verify

Tool	Description
`verify_diagram`	Check for issues like missing endpoints or orphaned nodes
`plan_import`	Step-by-step workflow for importing an existing codebase
`get_guide`	Reference guide for node types, protocols, and best practices

Node Types

client · frontend · backend · database · cache · queue · storage · external

Edge Protocols

REST · gRPC · GraphQL · WebSocket · TCP · UDP · async · event · internal

Example Prompts

Once connected, try asking your AI agent:

Prompt	What it does
"Import this codebase into Composer"	Scans your repo and builds the architecture diagram
"Create a new Composer diagram called Backend Architecture"	Creates and auto-selects a new diagram
"Add a Redis cache between the API and the database in Composer"	Adds a new node and edges to the diagram
"Add analytics monitoring to the Composer diagram"	Adds observability nodes and connections
"Update the APIs I defined in Composer"	Refreshes endpoint definitions on backend nodes
"Verify my Composer diagram"	Checks for missing endpoints, orphaned nodes, etc.
"Link each Composer node to its source code"	Associates diagram nodes with file paths

How It Works

Changes made through MCP are immediately visible on the Composer canvas via real-time WebSocket sync.

Development

bash

git clone https://github.com/olivergrabner/composer-mcp
cd composer-mcp
npm install
npm run dev        # Watch mode (rebuilds on change)
npm run build      # Production build

License

MIT

Composer

Quick Install

Install Config Generator

Documentation Overview

Getting Started

Connect your IDE

Tools

Diagram Management

Read

Write

Plan & Verify

Node Types

Edge Protocols

Example Prompts

How It Works

Development

Links

License

Related MCP Servers

Frequently Asked Questions about Composer

AllMCPs Directory Badge

Technical Specs & Signals

Moxie Docs MCP

Own this project?

Share & Embed

Explore more

Composer

Quick Install

Install Config Generator

Documentation Overview

Getting Started

Connect your IDE

Tools

Diagram Management

Read

Write

Plan & Verify

Node Types

Edge Protocols

Example Prompts

How It Works

Development

Links

License

Related MCP Servers

Frequently Asked Questions about Composer

AllMCPs Directory Badge

Technical Specs & Signals

Moxie Docs MCP

Own this project?

Share & Embed

Explore more