Lex — Temporal Luxembourg and EU Law MCP Server

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answering

Lex — Temporal Luxembourg and EU Law is answering right now. Last checked 8 min ago. It exposes 10 tools. Last commit 3 Sep 2026.

Temporal search and comparison for official Luxembourg and reviewed EU law, with provenance.

Uptime history 80 days of history · worst day 0%

80 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

267 ms

Response time

average over 24h

Stars

last commit 3 Sep 2026

What changed 28

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 9 August 2026. No other catalogue keeps this.

16 Aug 6 tools changed the parameters they ask for12 times that day article_history, as_of, changes_in_period and 3 more

16 Aug a tool description was rewritten cited_by

12 Aug 10 tools changed the parameters they ask for article_history, as_of, changes_in_period and 7 more

12 Aug a tool changed version

9 Aug 2 tool descriptions were rewritten diff, search

9 Aug 2 tools changed the parameters they ask for diff, search

and 6 more, back to 9 August 2026

What the code does

We read the source, 5 d ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Executes code built at runtime web/smoke.mjs:55

    dom.window.eval(code);

Runs an external command src/Lex.Ingest/IndexFromCorpus.cs:816

        var start = new ProcessStartInfo("git")

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add lex --transport http https://law.soufien.lu/mcp

Settings → Connectors → Add custom connector, then paste this address

https://law.soufien.lu/mcp

~/.codex/config.toml

[mcp_servers.lex]
url = "https://law.soufien.lu/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "lex": {
      "url": "https://law.soufien.lu/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "lex": {
      "type": "http",
      "url": "https://law.soufien.lu/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, but it did not say what kind of credentials it expects.

Available tools 10

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

article

article_history

Every distinct text ONE provision (article/annex) has had on its publisher timeline, plus lifecycle events (inserted/removed/renumbered, renumbering detected mechanically by identical text hash). Read timeline_semantics before calling an interval legal applicability. Answers "what did Article X say over its life / when did it change".

as_of

The state of one document as it stood on one date. Pure lookup, no ranking. mode=outline lists provisions without text and may be narrowed with anchors; mode=select returns only the named anchors' text; mode=full (default) returns the whole text. Every provision carries its own permalink and hash.

changes

changes_in_period

ACROSS the corpus: which works gained new versions between two dates, how many each, and when — the aggregate counterpart of diff/timeline (which cover ONE work). Use for "what changed between 2025 and 2026", "which laws changed most during the pandemic", "what moved last month". order=by_churn ranks by number of new versions; by_date (default) lists most recently changed first.

cited

cited_by

Which held provision versions contain captured publisher cross-references to this work. This reverse lookup reports the publisher references Lex captured; it does not classify their relationship type or assess current legal effect.

coverage

coverage

What we hold and what we lack, tier by tier: counts, date ranges, history_begins, known gaps. This tool exists to say what we do NOT have.

diff

diff

What changed between two dates for one work: which publisher versions cover the selected dates and, where both texts are held, retrieve them via as_of to compare. An optional held article anchor scopes the typed comparison workspace. Read timeline_semantics before describing legal applicability.

force

in_force_on

Compatibility name for publisher states covering a date, computed from timeline intervals and deduplicated by work. Legilux states describe applicability; EUR-Lex states are official consolidated wording states and must not be called entry into force. Every envelope carries timeline_semantics and the result carries a mandatory population disclosure.

provenance

provenance

Proof chain for one lex_id: source URI, retrieval time, record/body hashes, event chain, corpus commit, index build, stamp signature.

search

Filtered legal search. keyword is deterministic FTS5/BM25; hybrid adds the pinned local encoder and fixed RRF when verified vectors are mounted. No generative model participates. The response query_plan separates resolved work constraints, article and role intent, and residual provision terms. Returns hits WITHOUT body text; full state via as_of.

timeline

timeline

Every publisher state a document has been in: timeline intervals, version keys, and explicit timeline_semantics. Legilux intervals describe applicability; EUR-Lex intervals describe official consolidated wording states, not entry into force.

Endpoints

URL	Transport	State	Latency	Checked
https://law.soufien.lu/mcp	streamable-http	needs auth	286 ms	8 min ago

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Lex — Temporal Luxembourg and EU Law — questions

Answers built from our own checks of this server.

What can Lex — Temporal Luxembourg and EU Law do?

It exposes 10 tools, read directly from the server on our last check. Among them: article_history, as_of, changes_in_period, cited_by, coverage, diff and 4 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Lex — Temporal Luxembourg and EU Law working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 267 ms. The bar chart above shows every period we have measured.

How do I connect Lex — Temporal Luxembourg and EU Law?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own credentials: it refuses anonymous clients.

Does Lex — Temporal Luxembourg and EU Law need an API key?

Yes. Every time we knock, Lex — Temporal Luxembourg and EU Law answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is Lex — Temporal Luxembourg and EU Law?

It answers our handshake in 267 ms on average, which is faster than 63% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Lex — Temporal Luxembourg and EU Law open source?

The code is open source: it is published under the Apache-2.0 licence, written in C#, 9 stars on GitHub and 7 open issues. The licence covers the code in the repository, not the hosted service at law.soufien.lu, which runs on its operator's own terms.