Composer MCP server

by OliverGrabner·io.github.OliverGrabner/composer·v0.1.7·4 stars

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

B82/100grade B

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Safety scan

B82/100

full report

Adoption

New

4 stars52 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Composer tools (16, 4 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

create_diagramwrite action
Create a new diagram and auto-select it for this session.
define_api
Define API endpoints on a service node (full replacement).
delete_elementwrite action
Delete a node or edge from the diagram.
get_graph
Get the full architecture diagram -all nodes and edges.
get_guide
Get the Composer reference guide -node types, edge protocols, completeness criteria, and available tools. Call this BEFORE creating or modifying any nodes/edges.
get_node
Get full details for a single node including connected edges.
get_screenshot
Get a base64-encoded PNG thumbnail of the diagram captured during the last auto-save in the Composer UI.
link_path
Link a node to a file or folder path in the codebase.
list_diagrams
List all diagrams accessible to you. Call this first to find which diagram to work on.
plan_import
Get the step-by-step workflow for importing a codebase into Composer. Call this when about to scan a repository and recreate its architecture as a diagram.
rename_diagram
Rename the currently selected diagram.
search_graph
Search the diagram for nodes and edges matching a keyword. Searches names, descriptions, tags, paths, endpoints, entities, edge labels, and data flows.
select_diagram
Select which diagram to work on for this session.
upsert_edgewrite action
Create or update a connection between two nodes.
upsert_nodewrite action
Create or update an architecture node on the diagram.
verify_diagram
Check the diagram for completeness issues -orphaned nodes, missing endpoints/entities/descriptions, edges without data_flow. Call after building to catch gaps.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings

Code scan9 source files scanned25/25
–Live reliabilityno gateway calls yet and no remote to proben/a
–Tool poisoningtools not inspected (local package is not executed); not countedn/a
Auth qualitylocal package, no credentials required12/15
Maintenancelast push 172 days ago8/15
Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Overall 82/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

How Composer compares

Against every graded AI and agents MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 82/100; higher than 65% of 4,460 AI and agents servers
Tools: 16; the typical AI and agents server has 6
Tools that change things: 25%; typical: 0%. Fewer write tools means less an agent can break
GitHub stars: 4; more than 77% of 2,711 AI and agents servers
Downloads a week: 52; more than 43% of 1,538 AI and agents servers with a package

What its tools let an agent do: 11 read · 1 create · 3 change · 1 delete

Install Composer in Claude Code, Cursor or VS Code

Runs npx -y @usecomposer/mcp on your machine. Read the scan report first; the gateway never runs local packages.

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

Add to Cursor

What the publisher says

From the Composer repository's README, as published. We do not edit it. Read it on GitHub

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

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Composer: common questions

Is Composer MCP server safe?: Mostly: it is graded B (82/100). Read the Composer safety report
How do I install Composer?: It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Composer need an API key?: Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Composer maintained?: The last commit was 209 days ago (2026-04-09). The latest release is v0.1.7.
What can I use instead of Composer?: Servers from other publishers that do the same job: Figma Context MCP server, Openflowkit MCP server and VisualTorch MCP server.
How does Composer compare with other AI and agents MCP servers?: safety score 82/100 (higher than 65% of 4,460 AI and agents servers); tools 16 (the typical AI and agents server has 6); tools that change things 25% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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