Gaff Check MCP server

gaff-check

Due diligence on any Irish property, for AI agents.

gaff-check is an open-source MCP (Model Context Protocol) server that gives AI assistants — Claude, Cursor, ChatGPT, or any MCP-compatible agent — ground truth from Ireland's scattered public property datasets.

Ask your assistant:

"Should I bid on this bungalow in Killiney? Tell me everything I should worry about."

…and it can check, in one conversation:

• 🏗️ Planning applications near the property (that pending apartment block behind the back garden)
• 💶 Sold prices on the street and in the area (Property Price Register)
• 🌊 Flood risk (OPW / GSI flood mapping)
• ☢️ Radon risk (EPA radon risk areas)
• 🗺️ Zoning (Myplan generalised land-use zoning)
• ⚡ BER / energy rating context and retrofit grant signals
• 🚓 Recorded-crime context for the containing Garda sub-district — category counts and carefully qualified rates, never a safety score

All from official, public Irish datasets. No scraping of commercial listing sites. Records and clearly labelled derived context — never invented certainty.

Why

Buying (or renovating, or just being nosy about) a house in Ireland means trawling six-plus government websites, each with its own dreadful UX, none of which talk to each other. The data is public. The synthesis isn't. gaff-check is the glue: a single, boring, reliable tool layer so the reasoning can happen in your AI assistant.

What it is not

• Not a valuation engine. It returns records; your agent does the thinking.
• Not a Daft/MyHome scraper. Public state data only.
• Not a website. It's a utility that enhances tools you already use.

Quick start

gaff-check runs as a stdio MCP server and requires Node.js 20 or newer. Do not run npx -y gaff-check on its own: it will wait for an MCP client to send requests, so the terminal will appear to hang. Add it to your assistant instead; no API keys or separate package installation are needed.

Claude Code:

claude mcp add --transport stdio --scope user gaff-check -- npx -y gaff-check

Run /mcp in Claude Code to confirm that gaff-check is connected. --scope user makes it available in every project; omit that option if you want Claude Code's default project-local configuration instead.

Codex:

codex mcp add gaff-check -- npx -y gaff-check

Run codex mcp list to confirm the server is configured, then start a new Codex session and use /mcp to inspect the active tools.

Claude Desktop (claudedesktopconfig.json):

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

What it looks like

Shortened. The full README is on GitHub.