# Cenogram MCP Server

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[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)

**Polish Real Estate Transaction & Parcel Data for AI**

MCP server for Polish real estate data. Access 8M+ real estate transactions from the national Registry of Prices and Values (Rejestr Cen Nieruchomosci, RCN) - prices from notarial deeds, not listings - directly from Claude, Cursor, ChatGPT, Grok, or any MCP-compatible AI assistant. Beyond transaction prices, the server resolves cadastral parcels and adds per-parcel context: zoning, flood and landslide risk, heritage register, building permits and construction activity, public transport access, agricultural land classification and surrounding land use.

Data source: Polish national RCN registry (Rejestr Cen Nieruchomosci) | Platform: [cenogram.pl](https://cenogram.pl?src=mcpstdio)

## Get your API key

1. Go to [cenogram.pl/api](https://cenogram.pl/api?src=mcpstdio)
2. Enter your email
3. You'll receive your `cngrm_...` API key by email

Manage your keys at [cenogram.pl/ustawienia](https://cenogram.pl/ustawienia).

## Installation

Pick your client. All options below use the hosted server - no local install needed (except npx/stdio).

<details open>
<summary><strong>Claude Code</strong></summary>

One command - zero config files:

```bash
claude mcp add cenogram https://mcp.cenogram.pl/mcp \
  -t http -H "Authorization: Bearer YOUR_API_KEY"
```

</details>

<details>
<summary><strong>Cursor</strong></summary>

Add to `.cursor/mcp.json` in your project:

```json
{
  "mcpServers": {
    "cenogram": {
      "type": "http",
      "url": "https://mcp.cenogram.pl/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}
```

</details>

<details>
<summary><strong>Claude Desktop</strong></summary>

Add to your config file:
- macOS: `~/Library/Application Support/Claude/claude_desktop_config.json`
- Windows: `%APPDATA%\Claude\claude_desktop_config.json`

**npx (stdio):**
```json
{
  "mcpServers": {
    "cenogram": {
      "command": "npx",
      "args": ["-y", "@cenogram/mcp-server@latest"],
      "env": {
        "CENOGRAM_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}
```

</details>

<details>
<summary><strong>VS Code / GitHub Copilot</strong></summary>

Add to `.vscode/mcp.json` in your workspace:

```json
{
  "servers": {
    "cenogram": {
      "type": "http",
      "url": "https://mcp.cenogram.pl/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}
```

</details>

<details>
<summary><strong>Windsurf</strong></summary>

Add to `~/.codeium/windsurf/mcp_config.json`:

**HTTP remote:**
```json
{
  "mcpServers": {
    "cenogram": {
      "type": "http",
      "url": "https://mcp.cenogram.pl/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}
```

If HTTP doesn't work, use the **npx (stdio)** option below instead.

</details>

<details>
<summary><strong>Cline</strong></summary>

In VS Code: Settings > Cline > MCP Servers. Add:

```json
{
  "cenogram": {
    "type": "http",
    "url": "https://mcp.cenogram.pl/mcp",
    "headers": {
      "Authorization": "Bearer YOUR_API_KEY"
    }
  }
}
```

</details>

<details>
<summary><strong>npx (stdio) - local/offline</strong></summary>

Requires **Node.js >= 18**. Use this if you want to run the server locally instead of connecting to the hosted one.

```json
{
  "mcpServers": {
    "cenogram": {
      "command": "npx",
      "args": ["-y", "@cenogram/mcp-server@latest"],
      "env": {
        "CENOGRAM_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}
```

| Client | Config file |
|---|---|
| Cursor | `.cursor/mcp.json` |
| Claude Code | `.mcp.json` in your project |
| Claude Desktop | `~/Library/Application Support/Claude/claude_desktop_config.json` |
| Windsurf | `~/.codeium/windsurf/mcp_config.json` |
| Cline | VS Code settings > Cline > MCP Servers |

</details>

## Configuration

| Env Variable | Required | Default | Description |
|---|---|---|---|
| `CENOGRAM_API_KEY` | **Yes** (stdio) | - | API key from [cenogram.pl/api](https://cenogram.pl/api?src=mcpstdio) |
| `CENOGRAM_API_URL` | No | `https://cenogram.pl` | API base URL |
| `MCP_TRANSPORT` | No | `stdio` | Set to `http` for Streamable HTTP mode |
| `MCP_PORT` | No | `3002` | HTTP server port (HTTP mode only) |
| `CENOGRAM_CLIENT_ID` | No | auto-generated | Persistent client identifier |

You can also use the `--http` CLI flag instead of `MCP_TRANSPORT=http`.

## Tips

- **Model selection**: For best results, use Claude **Opus 4.7**. It makes more sequential tool calls and produces richer analysis. You can switch the model in the dropdown at the bottom of the chat window.

## Example Prompts

**Polish:**
- "Jaka jest mediana cen mieszkan w Krakowie w 2025?"
- "Pokaz transakcje z ulicy Pulawskiej 15 na Mokotowie"
- "Znajdz transakcje na dzialce 126104_9.0015.201"
- "Sprawdz plan miejscowy i ryzyko powodziowe dla dzialki 126104_9.0015.201"
- "Znajdz transakcje gruntow w promieniu 5km od centrum Wroclawia powyzej 500 000 PLN"
- "Porownaj ceny mieszkan na Mokotowie i Woli"
- "Pokaz rozklad cen nieruchomosci w Polsce"

**English:**
- "What's the median apartment price in Krakow in 2025?"
- "Show transactions at Pulawska 15 in Mokotow"
- "Find all transactions on parcel 126104_9.0015.201 and then search nearby"
- "Check the zoning and flood risk for parcel 126104_9.0015.201"
- "Find land transactions within 5km of Wroclaw center above 500,000 PLN"
- "Compare apartment prices in Mokotow and Wola districts"
- "Show the price distribution of real estate in Poland"

## Tools

| Tool | Description | Key Parameters |
|---|---|---|
| `search_transactions` | Search transactions with filters | location, street, buildingNumber, parcelId, propertyType, marketType, price/date/area range |
| `get_price_statistics` | Price/m2 stats by location (residential only) | location (optional) |
| `get_price_distribution` | Price histogram | bins, maxPrice |
| `search_by_area` | Search by geographic radius | latitude, longitude, radiusKm |
| `get_market_overview` | Database overview and stats | (none) |
| `list_locations` | List available locations | search (optional) |
| `search_parcels` | Search parcels by cadastral ID prefix | q (parcel ID prefix, min 3 chars) |
| `search_by_polygon` | Search within a GeoJSON polygon | polygon, propertyType, dateFrom/dateTo |
| `compare_locations` | Compare stats across 2-5 districts | districts (comma-separated), propertyType |
| `get_building_breakdown` | Per-building breakdown for one transaction (footprint, storeys, est. floor area) | transaction_id (UUID from a search result) |
| `get_parcel_report` | Composite dossier for one parcel: core, 9 enrichment layers, transaction history, local price context and municipal context | parcelId (cadastral id or UUID) |
| `resolve_parcel` | Resolve a cadastral parcel identifier to its canonical record | parcelId or q (id prefix), or lat + lng |
| `get_demographics` | Population and demographic context for a location | location or teryt, year (or yearFrom/yearTo), category |
| `get_infrastructure_signals` | Municipal infrastructure signals (tenders, utilities, capital spending) | location or teryt |
| `estimate_value` | Comparable-sales value estimate for a property | area, plus lat + lng or parcelId; rooms, market |
| `get_transaction_flood` | Flood risk for the property in a transaction | transaction_id (UUID from a search result) |
| `get_transaction_heritage` | Heritage-register status for the property | transaction_id |
| `get_transaction_landslide` | Landslide risk for the property | transaction_id |
| `get_transaction_surroundings` | Nuisance and land-use context around the property | transaction_id |
| `get_transaction_transit` | Public transport accessibility for the property | transaction_id |
| `get_transaction_permits` | Building permits recorded for the property | transaction_id |
| `get_transaction_planning` | Local zoning and planning status for the property | transaction_id |
| `get_transaction_farmland` | Agricultural land-use classification for the property | transaction_id |

### Location naming

- Most cities: use the city name directly (e.g., "Gdansk", "Lublin")
- Warsaw: "Warszawa" covers all 18 districts at once; name one ("Mokotow", "Srodmiescie", "Wola") to narrow it down
- Krakow and Lodz work the same way: the city name covers every sub-district, or name one ("Krakow-Podgorze")
- Neighbourhood names are not administrative units - search by radius or polygon instead
- Use `list_locations` to find valid names

### Property types

| Value | Polish | English |
|---|---|---|
| `land` | Grunt | Land plot |
| `building` | Budynek | Building |
| `developed_land` | Grunt zabudowany | Developed land |
| `unit` | Lokal | Apartment/unit |

### Workflows

Results include parcel IDs and GPS coordinates, enabling multi-step research:

```
1. Search by address    -> search_transactions(location="Mokotow", street="Pulawska", buildingNumber="15")
2. Note parcel_id and coordinates from results
3. Search nearby        -> search_by_area(lat=52.19, lng=21.01, radiusKm=2, propertyType="unit")
4. Compare prices       -> get_price_statistics(location="Mokotow")
```

This mimics how a property appraiser finds comparable transactions for valuation reports.

## Data

- **8M+ transactions** from all of Poland (380 counties)
- **Date range:** 2003 - present
- **Source:** Polish national RCN registry (Rejestr Cen Nieruchomosci)
- **Refresh:** periodic updates from RCN
- **Per-parcel context:** zoning, flood and landslide risk, heritage register, building permits and construction activity, transit access, agricultural land use and surroundings, addressable by cadastral ID

## Troubleshooting

**"Error: CENOGRAM_API_KEY is required"** - This only applies to stdio mode. Make sure `CENOGRAM_API_KEY` is set in the `env` block of your MCP config. For HTTP remote, the key goes in the `Authorization` header instead.

**npx hangs or fails** - Check your Node.js version with `node -v`. The stdio mode requires Node.js >= 18. If you're on an older version, use the HTTP remote option instead (no Node.js needed).

**A location returns 0 results** - The name may not be an administrative unit. Districts and neighbourhoods are two different things: "Mokotow" is a district and works, "Sluzew" is a neighbourhood inside it and does not. Use `list_locations(search="...")` to find valid names, or search by radius (`search_by_area`) for anything smaller than a district.

**401 Unauthorized (HTTP mode)** - The `Authorization` header must be `Bearer cngrm_...` (with the `Bearer` prefix). Double-check that the full API key is included, not just the prefix.

## Development

```bash
git clone https://github.com/cenogram/mcp-server.git
cd mcp-server
npm install
npm test
npm run build
```

## License

MIT