Composer

Name: Composer
Author: olivergrabner

by olivergrabnerversion 0.1.7i★ –iRuns on your computer

Registry nameio.github.OliverGrabner/composer

Install

Overview

Description from the maker (original English)

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

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Design, images & audio

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "composer": {
      "command": "npx",
      "args": [
        "-y",
        "@usecomposer/mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add composer -- npx -y @usecomposer/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "composer": {
      "command": "npx",
      "args": [
        "-y",
        "@usecomposer/mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "composer": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@usecomposer/mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account olivergrabner, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Design, images & audioi

More stars than 0% of the other 2184 servers in this category
Published to the registry more recently than 5% of the other 2184 servers in this category
Basic checks equal to or better than 100% of the other 2184 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Composer safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.7) reached the registry 7 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Figma Context MCP, Claude Real Video, Figma MCP Server

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Figma Context MCP

by GLips

Give your coding agent access to your Figma data. Implement designs in any framework in one-shot.

Runs on your computer★ 16,165MITUpdated 5 months ago

Install

Claude Real Video

by HUANGCHIHHUNGLeo

Let any LLM watch a video locally — and search everything it has ever watched.

Runs on your computer★ 2,284MITUpdated 2 months ago

Install

Figma MCP Server

by figma

Figma’s official server gives AI your design data so it can turn designs into code or describe them accurately. Connects to Figma’s cloud.

Runs in the cloud★ 2,152Updated 13 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

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.

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

Getting Started

Connect your IDE

Claude Code:

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

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

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

Your browser will open for authorization on first use.

Claude Code

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

Cursor

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

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

Codex

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

VS Code (Copilot Chat)

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

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

VS Code (Cline)

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

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

VS Code (Continue)

Add to .continue/config.yaml:

mcpServers:

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

Windsurf

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

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

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

OpenCode

Create opencode.json in your project root:

"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

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

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Design, images & audioi

Common questions

Alternatives

Figma Context MCP

Claude Real Video

Figma MCP Server

README from the maker

Getting Started

Connect your IDE

Tools

Diagram Management

Read

Write

Plan & Verify

Node Types

Edge Protocols

Example Prompts

How It Works

Development

Links

License