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Search EUR-Lex, fetch parsed EU legislation and case law, explore the citation graph.
About
Search EUR-Lex, fetch parsed EU legislation and case law, explore the citation graph.
Security Report
6.5
Moderate6.5Moderate RiskClean, well-structured MCP server for querying EU legal data via LexAPI. Proper authentication via API key in environment variables, no malicious patterns, input validation on structured parameters, and appropriate permission scope for its purpose. Minor code quality observations around error handling breadth and lack of request logging, but these are low-severity. Supply chain analysis found 2 known vulnerabilities in dependencies (0 critical, 2 high severity). Package verification found 1 issue.
6 files analyzed · 7 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
LexAPI API key. Get one at https://lex-api.com/dashboard (FREE tier available; semantic tools require a paid plan).Required
Environment variable: LEXAPI_API_KEY
Override the LexAPI base URL. Defaults to https://lex-api.com/api/v1.
Environment variable: LEXAPI_BASE_URL
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-lex-api-lexapi-mcp": {
"env": {
"LEXAPI_API_KEY": "your-lexapi-api-key-here",
"LEXAPI_BASE_URL": "your-lexapi-base-url-here"
},
"args": [
"-y",
"@lexapi/mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
LexAPI MCP
Model Context Protocol server for LexAPI — query EUR-Lex, EU case law, and the citation graph from Claude, Cursor, and other MCP-enabled clients.
Install once, get an API key, and ask your AI assistant: "summarize Article 17 of the GDPR" or "which regulations amend Directive 95/46/EC?" — the model calls LexAPI directly.
Install
You'll need a LexAPI API key. Create one for free at lex-api.com/dashboard (50 calls/day on the FREE tier).
Claude Desktop
Add to claude_desktop_config.json (location: ~/Library/Application Support/Claude/claude_desktop_config.json on macOS):
{
"mcpServers": {
"lexapi": {
"command": "npx",
"args": ["-y", "@lexapi/mcp"],
"env": {
"LEXAPI_API_KEY": "lex_..."
}
}
}
}
Restart Claude Desktop.
Claude Code
claude mcp add lexapi --env LEXAPI_API_KEY=lex_... -- npx -y @lexapi/mcp
Cursor / other MCP clients
Any client that supports stdio MCP servers can run this. The command is npx -y @lexapi/mcp with LEXAPI_API_KEY in the environment.
Tools
| Tool | What it does |
|---|---|
lex_search | Structured EUR-Lex search (text, dates, document type, author, language). |
lex_get_document | Full parsed document by CELEX — metadata + articles, sections, tables, annexes. |
lex_get_metadata | Metadata only (faster than full content). |
lex_get_document_by_url | Fetch by EUR-Lex URL (pasted from a browser). |
lex_recent_documents | Recent Official Journal publications (default 7 days). |
lex_cited_by | Documents citing this CELEX (inbound, typed edges). |
lex_cites | Documents this CELEX cites (outbound, typed edges). |
lex_citation_network | Both directions in one call. |
lex_semantic_case_law | Embedding search over EU case law (paid plans). |
lex_semantic_legislation | Embedding search over EU legislation (paid plans). |
Configuration
| Env var | Default | Purpose |
|---|---|---|
LEXAPI_API_KEY | (required) | Your API key. Get one at lex-api.com/dashboard. |
LEXAPI_BASE_URL | https://lex-api.com/api/v1 | Override for self-hosted or staging. |
Troubleshooting
LEXAPI_API_KEY is not set — the env var isn't reaching the spawned process. Double-check the env block in your MCP client config.
LexAPI error (401 invalid_api_key) — the key is wrong or revoked. Generate a new one at the dashboard.
LexAPI error (429 …) — you hit your daily quota or per-minute rate limit. The server retries once automatically; if you see this in tool output, you're over quota. Upgrade your plan or wait for reset.
LexAPI error (403 …) on semantic tools — semantic search requires a paid plan. FREE tier returns 403 for those endpoints.
Local development
git clone https://github.com/Lex-API/lexapi-mcp.git
cd lexapi-mcp
npm install
npm run build
LEXAPI_API_KEY=lex_xxx node dist/index.js
License
MIT
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