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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.

Agent Plugins1 Skill1 MCP serverstdio

By Diogo EstevesLicense: MIT1 GitHub starsUpdated last week

Directory evidence

Runtimes
Agent Plugins
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 →

Get the plugin

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-agent/.

This listing currently publishes only the generic Agent Plugins format. Automatic install commands for other clients are not generated yet.

Plugin files

plugins/onsystem-agent/
├── 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-agent/plugin.json
{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "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/clients",
  "repository": "https://github.com/dgesteves/onsystem",
  "license": "MIT",
  "keywords": [
    "design-system",
    "shadcn",
    "react",
    "tailwindcss",
    "lint",
    "mcp"
  ]
}

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)