The Model Context Protocol is an open standard that lets AI assistants call outside tools. Once you add this server, your assistant can look up licenses directly instead of searching the web.

Does it cost anything or need a key?

No. It's free and needs no account or API key. It returns the same state-record data as the rest of the site.

Each tool call: the tool, the search terms or license number, the results returned, and the calling app's name, IP address and country. We use it to see what people look for; we never sell it.

Free tool

Verify licenses from inside your AI assistant

Plumb Registry runs a free MCP server. Add it to Claude, ChatGPT, Cursor or your own agent, and it can search and verify fire protection licenses in Texas (fire sprinkler, alarm and extinguisher) and California (C-16 fire protection) directly from state records.

Server URL (streamable HTTP, no key needed)

Tools

Tool	What it does	Example request
search_providers	Find licensed fire protection companies by state, city, county, service or company name.	"Licensed fire alarm companies in Pasadena, TX"
get_provider	One company's full record: licenses, expiration dates, locations, phone, and its page to cite.	"Tell me about this company's licenses"
verify_license	Check a fire protection license number: active or lapsed, who holds it, and when it expires.	"Is license ACR-3307692 current?"

How to connect

Claude (claude.ai or desktop): Settings → Connectors → Add custom connector, then paste the server URL.
Claude Code: claude mcp add --transport http plumb-registry https://plumbregistry.com/mcp
ChatGPT: in plans that allow custom connectors (developer mode), add a connector with the server URL.
Cursor, VS Code and other MCP clients: add {"mcpServers": {"plumb-registry": {"url": "https://plumbregistry.com/mcp"}}} to the client's MCP settings.
Your own agent: it's also listed in the official MCP Registry as com.plumbregistry/directory.

Every result includes the company's page URL and the date its license was verified, so your assistant can cite its source. Prefer plain web access? Use the JSON API.

Frequently asked questions

What is MCP?: The Model Context Protocol is an open standard that lets AI assistants call outside tools. Once you add this server, your assistant can look up licenses directly instead of searching the web.
Does it cost anything or need a key?: No. It's free and needs no account or API key. It returns the same state-record data as the rest of the site.
What do you log?: Each tool call: the tool, the search terms or license number, the results returned, and the calling app's name, IP address and country. We use it to see what people look for; we never sell it.