bartosz-kuc/honest-stat-gov-mcp

Local MCP server for the Polish Central Statistical Office (GUS) Bank Danych Lokalnych (BDL) — the definitive public source for Polish socioeconomic statistics: population, prices, business demographics, unemployment, GDP, at country / voivodeship / powiat / gmina resolution.

Part of the honest-mcp family of small, auditable, local-first MCP servers.

Why

BDL contains tens of thousands of time series about Poland. Its web UI (bdl.stat.gov.pl) is powerful but slow to navigate when you know exactly what you want. The public REST API is the fast path but has enough concepts (subjects → variables → units → data) to make manual use annoying. This server lets your AI find the right variable and unit and pull the data — one conversation, done.

Same trust model as the rest of the family: data flows only between your machine and GUS.

Features

Five tools:

• search_subjects — browse or search the subject tree (e.g., "CENY", "LUDNOŚĆ")
• search_variables — find data series in a subject
• search_units — find territorial units (voivodeship, powiat, gmina) by name and/or level
• get_unit_details — full record for a unit ID
• get_data — pull actual values for a variable across chosen units and year range. With unit_ids, only those units are returned (one API request per unit); without them, all voivodeships

Data source

• Endpoint: bdl.stat.gov.pl/api/v1 — GUS BDL public REST API
• No API key required; anonymous limits are 5 req/s, 100 per 15 min, 1,000 per 12 h and 10,000 per 7 days (api.stat.gov.pl)
• get_data with unit_ids makes one request per unit (at most 4 req/s); on HTTP 429 it stops and lists the units it did not fetch
• Higher limits are available with free registration (API key); this server does not send a key, so it always uses the anonymous limits

Requirements

• Python 3.10+

Setup

git clone https://github.com/bartosz-kuc/honest-stat-gov-mcp.git
cd honest-stat-gov-mcp
python3 -m venv venv
./venv/bin/pip install -r requirements.txt

On Windows, use venv\Scripts\pip and venv\Scripts\python instead of the venv/bin/... paths here and below.

Register with Claude Code:

claude mcp add stat-gov /absolute/path/to/venv/bin/python /absolute/path/to/server.py

Claude Desktop claude_desktop_config.json:

{
  "mcpServers": {
    "stat-gov": {
      "command": "/absolute/path/to/venv/bin/python",
      "args": ["/absolute/path/to/server.py"]
    }
  }
}

Example usage

"How has the average monthly wage changed in Mazowieckie over the last 10 years?"

Three-step: search_variables(name="przeciętne wynagrodzenie") → note variable ID → search_units(name="mazowieckie", level=2) → note unit ID → get_data(variable_id=..., unit_ids=[...], year_from=2015, year_to=2024) (with only year_from, just that one year is returned).

"Which voivodeships had the highest unemployment in 2024?"

search_variables(name="stopa bezrobocia") → get_data(variable_id=..., year_from=2024, year_to=2024) — default returns all voivodeships.

Data flow

Your AI client
     ↕  MCP stdio
This server (Python, on your machine)
     ↕  HTTPS
bdl.stat.gov.pl (GUS)

No cloud middle. No telemetry.

Author

Bartosz Kuć — Warsaw-based developer, JDG owner running skanfirmy.pl.

• GitHub: https://github.com/bartosz-kuc

• Email: [email protected]

Consulting

Available for consulting on Polish tax and business integrations (KSeF, GUS/NFZ/GIOŚ APIs, mBank data), MCP server design, and AI-assisted tooling for JDGs and small teams. See skanfirmy.pl/uslugi for productized packages (audit 3k PLN, setup 8-15k PLN, retainer 2-4k PLN/mo), or reach out via email.

License

MIT — see LICENSE.

Related

• Part of the honest-mcp family — see the family index.