domain_lookupLABSCO SUMMARY
One tool, one question, one API key.
Technology-stack questions are exactly where a model's training data goes stale, and this replaces recollection with a dated detection from BuiltWith. The detection dates and links are the part worth using: they tell you when the technology was seen, not just that it was. Everything hinges on having a BuiltWith key, since the server is a thin wrapper around their API.
What it is
A small MCP server over the BuiltWith API for looking up a website's technology stack. It runs locally over stdio and works with any MCP-compatible assistant.
What you get
domain_lookup— the technology stack for one domain, taking the domain and an optionaldetailedflag- Technologies grouped by category — analytics, CMS, frameworks and the rest — so the answer is organised rather than a flat list
- Descriptions, detection dates and links for each technology, which is what turns "they use X" into something checkable
- A Node API client you can import directly if you want the same lookups outside MCP
Requirements
A BuiltWith API key, passed as BUILTWITH_API_KEY either in the environment or in your client's MCP settings. Node.js 18 or higher; clone, npm install, npm run build, then point your client at the built entry point. The README notes that the MCP SDK is installed from GitHub rather than npm and gives a fallback if that dependency does not resolve. MIT licensed.
Setup effort
Build from source — git clone https://github.com/Cyreslab-AI/builtwith-mcp-server.git
USE CASES
01
Qualifying a prospect before a call
Look up the domain and read back the stack grouped by category, with the detection dates.
02
Checking a competitor's analytics or commerce setup
Ask about one category on a specific domain rather than reading a whole report.
03
Getting the detail behind a detection
Turn on the detailed flag for descriptions and links alongside the technology names.
1 tool
Listed in project docs. Your client may show a different list.
BEFORE YOU INSTALL
What to know first
Tools you get
1 tool named in the project's documentation.
Requires
- Node.js 18 or later
- BUILTWITH_API_KEY in your environment
Where it runs
Both documented clients run the server on your machine.
INSTALLATION
Connect your client
You clone and build this one yourself.
Server setup
TERMINAL
git clone https://github.com/Cyreslab-AI/builtwith-mcp-server.git
cd builtwith-mcp-server
npm install
npm run buildMCP Clients
Claude Desktop, Cline
JSON
{
"mcpServers": {
"builtwith": {
"command": "node",
"args": [
"<YOUR_PATH_TO_BUILTWITH_MCP_SERVER>/build/index.js"
],
"env": {
"BUILTWITH_API_KEY": "<YOUR_BUILTWITH_API_KEY>"
},
"disabled": false,
"autoApprove": []
}
}
}
