8th Wall MCP — n8n Nodes

Custom n8n nodes to call the 8th Wall MCP HTTP bridge (from this repo).

Overview

• One flexible node: invoke any MCP tool exposed by the HTTP bridge
• Router node: converts free-text requests to tool + args items
• Dynamic tool list loaded from /tools
• Simple credential: base URL of the bridge (default http://127.0.0.1:8787)

Prerequisites

• Run the MCP HTTP bridge from this repo in a separate process:
  • Build: npm run build
  • Start: HTTP_PORT=8787 MODE=local PROJECT_ROOT=./project npm run http

Install (as a local community package)

1. From n8n-nodes-8thwall/ run:
   • npm install
   • npm run build
2. In n8n, enable community nodes and install from local folder or publish to npm as n8n-nodes-8thwall.

Usage

• Add credentials: 8th Wall MCP Bridge API

  • Base URL: http://127.0.0.1:8787 (or your host/port)

• Add node: 8th Wall MCP Tool

  • Tool: pick from the dropdown (loads from /tools)
  • Args (JSON): parameters for the selected tool, e.g.
    • assets_download_url: { "url": "https://example.com/model.glb", "filename": "models/MyModel.glb" }
    • scene_add_gltf_model: { "src": "assets/models/MyModel.glb", "position": [0,1.2,-2], "scale": [0.5,0.5,0.5] }
    • devserver_start: { "port": 5173 }

• Or use the Router node to drive the MCP node dynamically:

  • Add node: 8th Wall MCP Router
  • Set Request to something like: "Scaffold an A‑Frame project and start the dev server on 5173"
  • Connect Router → 8th Wall MCP
  • In the MCP node, enable "Use Custom Tool Name"
    • Tool Name (Custom): expression {{$json.tool}}
    • Args (JSON): expression {{$json.args}}
  • The Router can emit multiple items (e.g., download then add model) — the MCP node will execute each in order.

Notes

• The node simply POSTs to /tool/<name> with the JSON body you provide.
• Response shape mirrors the bridge: { ok, tool, result }. The node outputs result (or the full body on error).
• To point at an 8th Wall Desktop project, set PROJECT_ROOT when starting the bridge, or use the desktop tools.