kio-orzeczenia-mcp

MCP server (Model Context Protocol) for the case law of the Krajowa Izba Odwolawcza (KIO) (National Appeals Chamber) at the Urzad Zamowien Publicznych (Public Procurement Office) - the public database orzeczenia.uzp.gov.pl.

It lets Claude / Cursor / VS Code MCP agents consume KIO rulings with verifiable citations (signature + URL + date).

Status: POC v0.1.0 | License: Apache-2.0 | Maintainer: MateMatic

Preliminary warning. The v0.1.0 connector is a proof-of-concept release. It fetches data from the public UZP case law database via HTML (no official REST API). Full legal disclaimer - see the "Legal disclaimer" section below. A dedicated smoke test and notification to UZP are required before production deployment.

What KIO is

The Krajowa Izba Odwolawcza (National Appeals Chamber) is an administrative (quasi-judicial) body operating at the Urzad Zamowien Publicznych (Public Procurement Office) - KIO members are independent when adjudicating (art. 471 PZP) - which hears appeals against contracting authorities' decisions in public procurement proceedings (the Act of 11 September 2019 - Public Procurement Law). KIO rulings are made publicly available by UZP under the Act on access to public information.

KIO rulings are not a source of law within the meaning of art. 87 of the Constitution of the Republic of Poland - they are reference material widely used in the practice of law firms dealing with public procurement.

Related MCP server: mcp-nsa

Quickstart

# Clone and enter the directory
git clone https://github.com/matematicsolutions/kio-orzeczenia-mcp.git
cd kio-orzeczenia-mcp

# Virtualenv
python -m venv .venv
.\.venv\Scripts\Activate.ps1

# Install
pip install -e ".[dev]"

# Offline test (signature parser)
pytest tests/test_signature.py -v

# Smoke test (online - hits UZP, rate-limited 1 req/s)
pytest tests/test_smoke.py -v -m smoke

# Run the server (stdio)
python -m kio_orzeczenia_mcp.server

Wiring into Claude Code

Add to ~/.claude.json (or .mcp.json in the project):

{
  "mcpServers": {
    "kio-orzeczenia": {
      "command": "python",
      "args": ["-m", "kio_orzeczenia_mcp.server"],
      "env": {
        "KIO_MCP_RATE_LIMIT": "1.0",
        "KIO_MCP_CACHE_DIR": "~/.matematic/cache/kio"
      }
    }
  }
}

Restart Claude Code. After startup, 5 tools should be visible.

5 MCP tools

1. kio_search(query: SearchQuery) -> SearchResult

Search over KIO case law. All fields optional.

// Arguments:
{
  "phrase": "razaco niska cena",
  "signature": null,
  "date_from": "2024-01-01",
  "date_to": "2024-12-31",
  "pzp_article": "226",
  "subject_index": null,
  "inflection": true,
  "page": 1,
  "size": 20
}

Returns {total, page, items: [OrzeczenieSummary]}.

2. kio_get_orzeczenie(signature_or_id: str | int) -> Orzeczenie

Fetches the full text of a single ruling.

// Arguments:
"KIO 2924/21"   // string -> first search by signature to resolve internal_id (+1 req)
15903           // int -> directly GET /Home/HtmlContent/15903

Returns the full Orzeczenie with content_text, sentence, reasoning (if the parser can extract them), pzp_articles, chamber_composition, parties.

3. kio_recent(days: int = 30, limit: int = 20) -> list[OrzeczenieSummary]

The most recent rulings from the last N days, sorted by date descending.

// Arguments:
{ "days": 30, "limit": 20 }

4. kio_by_pzp_article(article: str, limit: int = 20) -> list[OrzeczenieSummary]

Rulings citing a specific PZP article. Filtered by phrase + post-process (no server-side article filter).

// Arguments:
{ "article": "226", "limit": 20 }
{ "article": "224 ust. 1 pkt 1", "limit": 50 }

5. kio_get_pdf_url(signature_or_id: str | int) -> dict

Returns the URL to the PDF (rendered by UZP from .docx via Qt 4.8.7). Does not fetch bytes - we link to it.

// Returns:
{
  "pdf_url": "https://orzeczenia.uzp.gov.pl/Home/PdfContent/15903?Kind=KIO",
  "signature": "KIO 2924/21",
  "internal_id": 15903,
  "human_readable_citation": "Wyrok KIO z 2021-10-28, sygn. KIO 2924/21"
}

3 usage examples (natural language)

Example 1: "KIO rulings on abnormally low price from the past year"

The agent calls kio_search:

{
  "phrase": "razaco niska cena",
  "date_from": "2025-05-20",
  "date_to": "2026-05-20",
  "inflection": true,
  "size": 50
}

Result: a list of OrzeczenieSummary with human_readable_citation ready to insert into a court filing.

Example 2: "KIO rulings citing art. 226 sec. 1 point 5 PZP"

The agent calls kio_by_pzp_article:

{ "article": "226 ust. 1 pkt 5", "limit": 30 }

Example 3: "Ruling KIO 2924/21 - who were the parties and was the appeal upheld"

The agent calls kio_get_orzeczenie:

"KIO 2924/21"

Result: the full Orzeczenie with parties, sentence, reasoning.

Limitations (POC)

1. Mapping signature -> internal_id requires a search - if you query by signature, we make +1 req

2. No server-side filter by PZP article - filtering done via phrase search + post-process (may miss some hits)

3. PDF not fetched - only a link to the UZP page (product decision)

4. The sentence/reasoning parser is shallow - in the POC we return content_text as plain text. Splitting into sections -> v1.0

5. Rate limit 1 req/s - large lists may be slow. A 7-day cache for rulings (immutable) mitigates this.

Cache

• Rulings (immutable): 7 days

• Search result lists: 6 hours

• PZP dictionary (once implemented): 30 days

Cache location: ~/.matematic/cache/kio/ (configurable via KIO_MCP_CACHE_DIR).

Audit log

Location: ~/.matematic/audit/kio-orzeczenia-mcp.jsonl

JSONL format (one entry per tool call). See CONSTITUTION.md Art. 3.

What is NOT logged: the full text of a ruling (content_text, reasoning). We log only signatures and metadata.

Legal disclaimer

The data comes from the public UZP case law database (orzeczenia.uzp.gov.pl), made available under the Act of 6 September 2001 on access to public information and the Act of 11 September 2019 - Public Procurement Law.

The connector:

• does not modify the source data,

• does not de-anonymize the parties to a proceeding beyond what UZP publishes,

• does not circumvent any technical protections,

• identifies itself with the User-Agent header matematic-kio-mcp/{version} (+https://matematic.co).

Pre-release blocker. Before publishing the repository on GitHub, a notification to UZP (kontakt@uzp.gov.pl) about launching the connector is planned - User-Agent, query limit, nature of access. Status: TODO.

In case of objections from UZP or other parties - contact: kontakt@matematic.co.

License

Apache-2.0. See LICENSE.

Project constitution

See CONSTITUTION.md - 4 governance principles (public data, rate limit, audit log, citations).

Other open connectors for Polish law

Open-source connectors by MateMatic that complement the scope of this repository:

• mcp-saos - SAOS (Supreme Court, Supreme Administrative Court, common courts)

• mcp-eu-sparql - EU law via Cellar SPARQL

• mcp-isap - Journal of Laws, Monitor Polski, ministerial gazettes (Sejm ELI API)

External catalog of legal sources: worldwidelaw/legal-sources (bulk harvest scripts, MIT).