onsystem MCP Server: Install & Setup

Install onsystem in Claude Code

Claude Code

claude mcp add onsystem -- npx -y onsystem

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

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

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

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

Run: claude mcp add onsystem -- npx -y onsystem

nxtg-ai/forge-orchestrator

Forge orchestrator MCP server for Claude Code (alpha). Codex/Gemini runners are not in the alpha.

MladenSU/cli-mcp-server

Command-line execution with customizable security policies.

DenRakEiw/scumble

Agents drive a layered AI inpainting editor: select by text, inpaint, mask, layers, PSD/ORA export.

satelliteoflove/godot-mcp

Agent-driven Godot playtesting: editor control, input injection, game-time stepping, live state.

ScopeBlind/scopeblind-gateway

Fail-closed Cedar policy gate + Ed25519 signed receipts for agent tool calls. Denies on any error.

debugmcp/mcp-debugger

Step-through debugging for AI agents: breakpoints, stepping and live variables in ten languages