@propraven/mcp

Model Context Protocol server for PropRaven — gives Claude, ChatGPT, Cursor, and any MCP-compatible agent canonical access to 191.3M US parcels (110.0M mapped) with ownership, valuation, permits, deeds, hazard, and market data.

Hosted endpoint: https://propraven.com/mcp (Streamable HTTP, no install — docs: https://propraven.com/docs/mcp · agents + x402: https://propraven.com/docs/agents). Or run the stdio server locally (below).

Hosted (no install)

Point any HTTP-transport MCP client at https://propraven.com/mcp with your API key as a bearer header. Claude Desktop / Cursor (claude_desktop_config.json, ~/.cursor/mcp.json):

{
  "mcpServers": {
    "propraven": {
      "url": "https://propraven.com/mcp",
      "headers": { "Authorization": "Bearer pz_your_real_key_here" }
    }
  }
}

Claude Code: claude mcp add --transport http propraven https://propraven.com/mcp --header "Authorization: Bearer pz_your_real_key_here". The claude.ai web connector uses OAuth instead — add a custom connector with the same URL and sign in.

Local stdio server (npx @propraven/mcp)

Requirements: Node ≥18, a PropRaven API key (pz_…) from https://propraven.com/settings/api-keys (free, no card).

Claude Desktop — edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "propraven": {
      "command": "npx",
      "args": ["-y", "@propraven/mcp"],
      "env": { "PROPRAVEN_API_KEY": "pz_your_real_key_here" }
    }
  }
}

Cursor (~/.cursor/mcp.json) takes the same block. Claude Code: claude mcp add propraven --env PROPRAVEN_API_KEY=pz_your_real_key_here -- npx -y @propraven/mcp.

Restart the client. The 8 PropRaven tools appear in the tool list.

Quick test

Look up parcel 37:119:12104406 and tell me the owner.

The agent should pick parcel_lookup and return the canonical parcel card with the owner.

ChatGPT: Custom GPT → Actions → OpenAPI URL https://api.propraven.com/openapi.json with API-key (Bearer) auth; native MCP-in-ChatGPT can use the hosted endpoint https://propraven.com/mcp (OAuth 2.1 + PKCE).

Tools

Names match the hosted server (^[a-zA-Z0-9_-]{1,64}$, as MCP clients and the Anthropic API require).

| Tool | Purpose | Backed by | |---|---|---| | parcel_lookup | Resolve one parcel by ID, address, or APN | GET /api/v1/parcels/{id} (ID) or GET /api/v1/search/full (address / APN) | | parcel_search | Text search by owner, address fragment, APN or city (+ state/city filters, keyset cursor) | GET /api/v1/search/full | | parcel_compare | Free card (+ hazards) for 2–25 parcels, for agent-side ranking | GET /api/v1/parcels/{id} (+ /risks) × N | | owner_pierce | Parcels titled under an owner name (optional state filter, best-effort ticker) | GET /api/v1/owners/{name}/portfolio (+ /owners/search for ticker) | | hazard_score | Flood / wildfire / seismic / windstorm / air-quality / crime blocks | GET /api/v1/parcels/{id}/risks | | valuation_estimate | Market value, AVM, assessed values, last sale, $/sqft | GET /api/v1/parcels/{id} | | permits_history | Permit timeline (≤100 newest, with true-count basis) | GET /api/v1/parcels/{id}/permits?shape=envelope | | sales_history | Deed / transfer timeline | GET /api/v1/parcels/{id}/deeds?shape=envelope |

Parcel IDs. The canonical form is state_fips:county_fips:parcel_id, e.g. 37:119:12104406. The legacy 5-digit form (37119:12104406) and PropRaven parcel UUIDs are also accepted. parcel_search and parcel_lookup's address search add a lookup_id to every result (search rows carry the PropRaven UUID in parcel_id), which parcel_lookup / parcel_compare accept.

No tool spends money. The client only issues GETs to the seven free / metered read endpoints above, refuses every other path before a request is sent (the paid parcel report, comp pack, risk score, owner report, leads, storefront, …), and never sends a payment header. If the API ever answers with an x402 402 Payment Required, the tool returns 402 payment required — this tool never pays. Calls still count against your plan's monthly quota. To buy a dossier, use the hosted server's explicit buy_* tools or propraven.com.

Errors are RFC 7807 problem details, surfaced as <status> <code>: <detail> (e.g. 404 not_found: …). A 429 or 503 is retried once when Retry-After is ≤ 10 s.

Tool descriptions call out when not to use each tool, which is the biggest determinant of agent selection accuracy.

Environment

| Variable | Default | Purpose | |---|---|---| | PROPRAVEN_API_KEY | (required) | Bearer token, format pz_... | | PROPRAVEN_BASE_URL | https://propraven.com | API host (every path starts with /api/v1). | | PROPRAVEN_TIMEOUT_MS | 30000 | Per-request timeout in ms. |

Requests carry User-Agent: @propraven/mcp/<version>.

Develop / inspect

npm ci
npm run build
npm test          # node:test suite — no network, no API key needed

# Live-reloading dev (TypeScript, no build step):
PROPRAVEN_API_KEY=pz_test... npm run dev

# Or open the MCP Inspector UI:
PROPRAVEN_API_KEY=pz_test... npm run inspect

The inspector at https://modelcontextprotocol.io/legacy/tools/inspector lets you call each tool manually and see request/response payloads.

Why this exists

Every Claude / ChatGPT / Cursor workflow that touches property data needs an authoritative parcel-lookup tool. There is no canonical property-data MCP today. PropRaven aims to be it before the first-mover window closes (~12–18 months).

License

Apache-2.0