Composer MCP Server

@OliverGrabner

Basic information

About Composer MCP Server

🔌MCP server that gives AI coding agents a visual architecture canvas

#mcp #mcp-server #architecture#system-design#diagram #visualization #claude-code #cursor #vscode #developer-tools #devtools#software-architecture#infrastructure #microservices#api-design#database #codebase#code-visualization#real-time#collaborative#oauth #typescript #npm #coding-agent #ai-agent #tool-use#software-engineering

Composer MCP Server config

Add this server to your MCP-compatible client using the configuration below.

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

Composer MCP Server tools

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Overview

What is Composer?

Composer is a visual system design tool that gives AI coding agents an architecture canvas to design, visualize, and evolve software architecture diagrams through the Model Context Protocol (MCP). It integrates directly with your IDE, allowing agents to add services, databases, queues, and connections, with a live canvas at usecomposer.com updating in real-time.

How to use Composer?

Connect your IDE by adding an MCP server using HTTP transport to https://mcp.usecomposer.com. For example, in Claude Code run claude mcp add --transport http composer https://mcp.usecomposer.com. Your browser will open for OAuth authorization on first use. Then use tools like create_diagram, upsert_node, upsert_edge, etc., via your AI coding agent.

Key features of Composer

Create and modify interactive architecture diagrams from your IDE.
Supports multiple node types: client, frontend, backend, database, cache, queue, storage, external.
Supports edge protocols: REST, gRPC, GraphQL, WebSocket, TCP, UDP, async, event, internal.
Real-time sync via WebSocket – changes appear instantly on the Composer canvas.
Verify diagrams for missing endpoints, orphaned nodes, and other issues.
Link nodes to files or folders in your codebase.

Use cases of Composer

Import an existing codebase and have the agent build a corresponding architecture diagram.
Add a Redis cache between the API and database in a diagram.
Define API endpoints on backend service nodes within the diagram.
Check the diagram for issues like missing endpoints or orphaned nodes.

Frequently asked questions

How does authentication work?

Authentication is handled via OAuth 2.1 – your browser opens for a one-time consent flow, then you're connected.

Where does diagram data live?

Your diagram data lives on Composer's servers. The MCP server itself is stateless.

What transports does Composer support?

The MCP server uses HTTP transport (URL: https://mcp.usecomposer.com). Some IDEs support an alternative stdio transport via npx (e.g., Codex: `codex mcp add composer -- npx -y @usecomposer/mcp --stdio`).

What is Composer's relation to other tools?

Composer is a dedicated architecture canvas that integrates with any MCP-compatible AI coding agent, providing specialized tools for system design and visualization.

Are there any known limits?

The README does not specify explicit limits. It notes that the server is stateless and data is hosted remotely.

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