onsystem MCP Server

by dgesteves Your server? Claim it

local only

onsystem runs on your own machine — the client starts it, so there is no endpoint to ping. Last commit 10 Oct 2026.

Keeps coding agents on your design system: knows your real components, props, variants and tokens.

—

Installs / week

npm · onsystem

Stars

8 open issues

10 Oct 2026

Last commit

from GitHub

MIT

License

TypeScript

Nothing serious here today

Today is the operative word: we check onsystem every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add onsystem -- npx -y onsystem

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

[mcp_servers.onsystem]
command = "npx"
args = ["-y", "onsystem"]

.cursor/mcp.json

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

.vscode/mcp.json

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

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onsystem — questions

Answers built from our own checks of this server.

Why is there no uptime for onsystem?

onsystem runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package onsystem.

How do I connect onsystem?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls onsystem straight from npm; nothing to host, nothing to sign up for.

Is onsystem open source?

Yes — it is published under the MIT licence, written in TypeScript, 1 stars on GitHub and 8 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.