Merser

Merser by Skyes Over London is a public npm MCP server and immersive source-world lab built from the MCP2/MCP4 extracted room packs.

React Three Fiber · Three.js · Drei · Postprocessing · GSAP · Lenis · Framer Motion · Motion · Theatre · Remotion · Cloudflare Pages · Model Context Protocol

Live world: merser.pages.dev

Connect To Claude, Cursor, Or Any MCP Client

Option 1 - npx

{
  "mcpServers": {
    "merser": {
      "command": "npx",
      "args": ["-y", "@skyes0verl0nd0n/merser", "--stdio"]
    }
  }
}

Option 2 - Global Install

npm install -g @skyes0verl0nd0n/merser
merser --stdio

{
  "mcpServers": {
    "merser": {
      "command": "merser",
      "args": ["--stdio"]
    }
  }
}

Option 3 - Remote HTTP

{
  "mcpServers": {
    "merser": {
      "url": "https://merser.pages.dev/mcp"
    }
  }
}

Remote HTTP access is gate-owned by the shared 0S/FS27/SkyGate/Free99 lane. The public endpoint returns 401 without a valid owner-issued bearer or shared gate session.

CLI

npx @skyes0verl0nd0n/merser --help
npx @skyes0verl0nd0n/merser --version
npx @skyes0verl0nd0n/merser --tools
npx @skyes0verl0nd0n/merser --config
npx @skyes0verl0nd0n/merser --health
npx @skyes0verl0nd0n/merser --stdio

The npm package is @skyes0verl0nd0n/merser; installed bin aliases include merser, merser-mcp, and Merser.

MCP Tools

| Tool | What it returns | | --- | --- | | mcp4_index | Full Merser index: public URLs, package commands, room ids, pack ids, and tool list | | mcp4_packs | Extracted source-pack manifest from the MCP2/MCP4 build lane | | mcp4_room | Real-world immersive room specs: barbershop, tattoo, med spa, gym, and source vault | | mcp4_component | Component vault entries pulled from the MCP bridge/source packs | | mcp4_prompt_pack | Prompt packets for using the Merser source-world lane | | mcp4_cli | CLI, local HTTP, deploy, stress, and remote access commands | | mcp4_build_plan | Build plan for turning source packs into immersive world-site artifacts | | mcp4_icons | Skyes/MetrAIyux icon registry and source-pack icon manifest |

Runtime Stack

| Dependency | Version | | --- | --- | | @modelcontextprotocol/sdk | ^1.29.0 | | @react-three/fiber | ^9.6.1 | | @react-three/drei | ^10.7.7 | | @react-three/postprocessing | ^3.0.4 | | three | ^0.184.0 | | postprocessing | ^6.39.1 | | gsap | ^3.15.0 | | lenis | ^1.3.23 | | framer-motion | ^12.38.0 | | motion | ^12.38.0 | | @theatre/core | ^0.7.2 | | remotion | ^4.0.464 | | @remotion/player | ^4.0.464 | | react | ^19.2.6 | | react-dom | ^19.2.6 | | zod | ^4.1.12 | | lucide-react | ^1.16.0 |

Live Surfaces

• Site: https://merser.pages.dev/
• Health: https://merser.pages.dev/health
• MCP endpoint: https://merser.pages.dev/mcp
• 0S SkyeWay listing: https://metraiyux-0s-full-system.graylondonskyes.workers.dev/skyeway.html

Local Development

git clone <your-workspace>
cd .vscode/MCP4
npm install
npm run dev
npm run start:http
npm run stress

Local stdio from this repo:

{
  "mcpServers": {
    "merser": {
      "command": "node",
      "args": ["/workspaces/MetrAIyux-0S/.vscode/MCP4/stdio-server.mjs", "--stdio"]
    }
  }
}

Stress And Proof

The release lane includes package, stdio, local HTTP, live site, live health, unauthenticated gate, and headed browser proof.

npm run stress
npm run build:worker
npm run deploy

Latest release proof at publish time:

• Stdio MCP calls passed.
• Local HTTP /health, tools/list, and tools/call stress passed.
• Live root and /health stress passed.
• Live unauthenticated /mcp correctly returned 401.
• Headed browser proof passed desktop and mobile with real interactions.

License

UNLICENSED. Public npm distribution is for controlled developer access to Merser, the source-world MCP server and release lane by Skyes Over London. Do not treat this as an open-source license grant.