onsystem · Office #48,917

What it is

Calls itself “plugin”.

• Calls itself: plugin

“…onsystem Keep coding agents on your design system”

“MCP server, Claude Code plugin, ESLint plugin and GitHub Action.”

What it costs

No free plan.

• Free plan: no

“MIT.”

Who it sells to

Sells to developers.

• Sells to: developers

“Keep coding agents on your design system”

How it runs

A browser extension. Runs locally and works offline. Distributed through the npm. Offers an API. AI is a side feature. Built with Vercel.

• Kind: extension
• Runs where: on the device, offline
• Distributed via: npm
• API: yes
• AI role: a side feature
• Built with: Vercel

“MCP server, Claude Code plugin, ESLint plugin and GitHub Action.”

“Static analysis from start to finish: no model calls, no API key, and it runs offline.”

What it works with

Integrates with Codex, Cursor, MUI and 1 more. Names @shadcn/lint, Claude Code and 1 more on its pages.

• Integrates with: Codex · Cursor · MUI · +1
• Names: @shadcn/lint · Claude Code · shadcn/ui

“@shadcn/lint is a linter: it polices the classes written against a component and the theme, in React, Svelte and Vue, on Tailwind v4.”

“MCP server, Claude Code plugin, ESLint plugin and GitHub Action.”

What it offers as proof

Live, no waitlist. Claims “1,200 agent runs, 6 models”. Try it without signing up. Publishes docs.

• Number claimed: 1,200 agent runs, 6 models
• Instant signup: yes
• Trial asks for: nothing

“Get started”

“No install, no config.”