onsystem MCP Server

by dgestevesio.github.dgesteves/onsystemv0.8.0

Catches palette colors, native elements and APIs your design system lacks in agent-written React.

1Node.jsstdioofficial registry

context tax

pending

security

100/100

cold start

pending

freshness

Active2d ago

Our reading of onsystem, from the data

onsystem is a design MCP server from dgesteves, listed in the official MCP Registry.

We haven't measured its tool list yet, so its token cost is unknown.

Maintenance is active: the last public signal was 2 days ago (2026-10-16). For comparison, 70% of design servers are active or maintained.

With 1 GitHub stars it ranks #214 of 696 design servers we index.

It runs locally on your machine over stdio.

Install onsystem MCP server

claude mcp add onsystem -- npx -y onsystem

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

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

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

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "onsystem": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "onsystem"
      ]
    }
  }
}

Add to .vscode/mcp.json in your workspace.

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

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

Security signals

100/100 — no known issues found as of 2026-10-19, from the checks below. This is not a guarantee of safety; review what a server can do before connecting it.

Deductions

No findings from the checks that ran.

Checks

✓Repository hygiene (archived, activity, license, security policy)
○Package metadata (install scripts, provenance) — pending
○Tool descriptions (prompt-injection and hidden-text heuristics) — pending
○Source scan (secrets, CVEs, risky code) by vectra-guard — pending

Scan it yourself before installing with vectra-guard, the open-source agent security CLI. Scoring rules

Freshness

Active — last maintenance signal 2d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-16 · 2d ago · GitHub
Latest release
2026-10-16 · 2d ago · GitHub · onsystem@0.8.0
Package published
no data · npm/PyPI
Registry entry updated
2026-10-16 · 2d ago · official registry · v0.8.0

How it compares in Design

Against the most-starred design servers we index. Token cost is per model turn, measured from each server's live tool list.

Server	Stars	Tools	Tokens / turn	Freshness	Runs
onsystem (this)	1	—	not measured	Active	local
Figma Developer	16,007	—	not measured	Slowing	local
Design System	11,774	—	not measured	Active	local
Magic	6,105	—	not measured	Maintained	—
Primer	3,918	—	not measured	Active	local
Dembrandt	3,722	—	not measured	Active	local

All design MCP servers

FAQ

›How do I install the onsystem MCP server in Claude Code?

Run: claude mcp add onsystem -- npx -y onsystem. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does onsystem require an API key?

No required environment variables are declared in its published metadata.

›Can I use onsystem as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is onsystem in the official MCP registry?

Yes, as io.github.dgesteves/onsystem.

Sources and method

Official MCP Registry entry: updated 2026-10-16
GitHub repository: fetched 2026-10-19
Package registry (npm / PyPI): listed
Security signals, computed by us: 2026-10-19
Last checked against all sources: 2026-10-19

The description, packages and links come from the maintainer's own published metadata. Token cost, security signals, freshness and the reading above are MCPSkillHub's own measurements; see the methodology. Spot an error? Request a correction or claim the listing.