LawMCP

MCP server for Polish and EU legal databases — ISAP (legal acts), SAOS (court judgments), EUR-Lex (EU legislation & CJEU case law), and Sejm API (legislative process).

Exposes legal data as tools for LLMs via the Model Context Protocol.

Tools

Tool	Sources	Description
search_legislation	ISAP + EUR-Lex	Search Polish and EU legislation in parallel. Only in-force acts by default.
read_act	ISAP	Read a Polish legal act — metadata, references, and full text in one call.
search_case_law	SAOS + CJEU	Search Polish and EU court judgments in parallel.
read_judgment	SAOS	Read a Polish court judgment by its SAOS ID.
read_eu_document	EUR-Lex	Read an EU document by its CELEX number.
search_legislative_process	Sejm API	Search legislative processes in the Polish parliament.

Installation

From source

git clone https://github.com/ItsRaelx/LawMCP.git
cd LawMCP
pip install -e .

With Docker

git clone https://github.com/ItsRaelx/LawMCP.git
cd LawMCP
docker build -t law-mcp .

Usage

Claude Desktop

Add to your Claude Desktop config file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

Using pip install:

{
  "mcpServers": {
    "law-mcp": {
      "command": "law-mcp"
    }
  }
}

Using Docker:

{
  "mcpServers": {
    "law-mcp": {
      "command": "docker",
      "args": ["run", "--rm", "-i", "law-mcp"]
    }
  }
}

Remote (Streamable HTTP)

Run the server with HTTP transport for remote access:

law-mcp --transport streamable-http --port 8000

Connect via http://host:8000/mcp. Set LAWMCP_ALLOWED_HOSTS environment variable to restrict allowed Host headers (e.g. LAWMCP_ALLOWED_HOSTS=lawmcp.example.com).

Claude Code

claude mcp add law-mcp -- python -m law_mcp

Or with Docker:

claude mcp add law-mcp -- docker run --rm -i law-mcp

MCP Inspector

mcp dev src/law_mcp/server.py

Docker Compose

docker compose up -d

Tool Details

search_legislation

Search legislation across Polish (ISAP) and EU (EUR-Lex) databases in parallel. By default only returns acts currently in force.

Parameter	Type	Default	Description
query	string	—	Full-text search query
title	string	—	Search in Polish act titles (ISAP-specific)
keywords	string	—	Comma-separated keywords (ISAP-specific)
date_from	string	—	Earliest date (yyyy-MM-dd)
date_to	string	—	Latest date (yyyy-MM-dd)
source	string	—	PL (Polish only), EU (EU only), or omit for both
in_force	bool	true	Only return acts currently in force
limit	int	10	Max results per source

read_act

Read a Polish legal act — returns metadata, references, and full text in one call. Accepts either an ELI identifier or publisher+year+position.

Parameter	Type	Description
eli	string	ELI identifier, e.g. DU/2024/1673
publisher	string	DU (Dziennik Ustaw) or MP (Monitor Polski)
year	int	Publication year
position	int	Position number in the journal

search_case_law

Search case law across Polish courts (SAOS) and EU Court of Justice (CJEU) in parallel.

Parameter	Type	Default	Description
query	string	—	Full-text search query
date_from	string	—	Earliest judgment date (yyyy-MM-dd)
date_to	string	—	Latest judgment date (yyyy-MM-dd)
court_type	string	—	Polish court filter: COMMON, SUPREME, ADMINISTRATIVE, CONSTITUTIONAL_TRIBUNAL, NATIONAL_APPEAL_CHAMBER
source	string	—	PL (Polish only), EU (EU only), or omit for both
limit	int	10	Max results per source

read_judgment

Read a Polish court judgment by its SAOS ID. Returns the full text, judges, legal bases, and referenced regulations.

Parameter	Type	Description
judgment_id	int	Numeric judgment ID from SAOS

read_eu_document

Read an EU legal document by its CELEX number from EUR-Lex. Works for regulations, directives, decisions, and CJEU judgments.

Parameter	Type	Description
celex	string	CELEX identifier, e.g. 32016R0679 (GDPR) or 62014CJ0362 (Schrems)

search_legislative_process

Search legislative processes in the Polish Sejm (parliament).

Parameter	Type	Default	Description
title	string	—	Search in process titles
date_from	string	—	Earliest date (yyyy-MM-dd)
date_to	string	—	Latest date (yyyy-MM-dd)
term	int	10	Sejm term number (current: 10)
limit	int	20	Max results

Data Sources

Source	Type	API
ISAP/ELI	Polish legal acts (Dziennik Ustaw, Monitor Polski)	REST/JSON
SAOS	Polish court judgments (500k+ records)	REST/JSON
EUR-Lex CELLAR	EU legislation and CJEU case law	SPARQL
Sejm API	Polish legislative process	REST/JSON

All APIs are public and require no authentication.

Future Integrations

The following commercial legal information systems could be integrated with API keys:

• LEX (Wolters Kluwer) — commentaries, glosses, consolidated texts with annotations
• Legalis (C.H. Beck) — legal commentaries, journal articles, case law annotations

These require commercial subscriptions and are not currently supported.

Development

pip install -e ".[dev]"
pytest -v
ruff check src/ tests/

License

MIT