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onsystem

v0.5.0

Keeps coding agents on your design system: it knows your real components, props, variants and tokens, catches the moment an agent invents one and has it fix it, and the same check gates your PRs. Local, zero config, works alongside @shadcn/lint.

Claude Code1 Skill1 MCP serverstdio

By Diogo EstevesLicense: MIT1 GitHub starsUpdated last week

Directory evidence

Runtimes
Claude Code
Parsed components
2 skill or MCP entries
Source updated
Oct 10, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install onsystem for Claude Code

Installs for the current user
claude plugin marketplace add IchenDEV/agent-plugin-mkt
claude plugin marketplace update agent-plugin-marketplace
claude plugin install onsystem-2@agent-plugin-marketplace

Paste and run these commands in a terminal with Claude Code. They add and refresh the PluginsMP catalog, then install this plugin.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually
git clone https://github.com/dgesteves/onsystem

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is plugins/onsystem/.

Plugin files

plugins/onsystem/
├── .claude-plugin/plugin.json
├── skills/onsystem/SKILL.md
└── .mcp.json

Included Skills1

onsystemskills/onsystem/SKILL.md

Build or change React UI with this project's own design system. Use when writing or editing components, pages or styles in .tsx/.jsx files, choosing colors, spacing or radius, or reviewing UI code. Look components, props, variants and tokens up with the onsystem MCP tools instead of guessing, and fix every check_ui finding.

MCP servers1

onsystemstdio
command
npx
args
-y [email protected]

Plugin manifests1

plugins/onsystem/.claude-plugin/plugin.json
{
  "name": "onsystem",
  "displayName": "onsystem",
  "version": "0.5.0",
  "description": "Keeps coding agents on your design system: it knows your real components, props, variants and tokens, catches the moment an agent invents one and has it fix it, and the same check gates your PRs. Local, zero config, works alongside @shadcn/lint.",
  "author": {
    "name": "Diogo Esteves",
    "url": "https://github.com/dgesteves"
  },
  "homepage": "https://onsystem.vercel.app/docs/plugin",
  "repository": "https://github.com/dgesteves/onsystem",
  "license": "MIT",
  "keywords": [
    "design-system",
    "shadcn",
    "react",
    "tailwindcss",
    "lint",
    "mcp"
  ],
  "icon": "./icon.svg",
  "documentationUrl": "https://onsystem.vercel.app/docs/plugin",
  "supportUrl": "https://github.com/dgesteves/onsystem/issues"
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[onsystem on Agent Plugins Marketplace](https://pluginsmp.com/plugins/onsystem-2)