eu.ansvar/czech-law-mcp
Czech legislation via MCP — full-text search across statutes and provisions
Open source Open in the app JSON README (API)
About
Czech legislation via MCP — full-text search across statutes and provisions
Details
- Kind
- MCP servers
- Topic
- Government & public data
- Publisher
- eu.ansvar
- Origin
- official
- Category
- ferramentas
- Transport
- local
- Version
- 1.0.1
- Stars
- 2
- Open pull requests
- 17
- Last push
- 2026-07-07T03:58:51Z
- Repository state
- arquivado
- Language
- TypeScript
- License
- NOASSERTION
- Added
- 2026-08-29 03:01:32
- Updated
- 2026-08-29 03:01:32
- Origin id
eu.ansvar/czech-law-mcp
README
# Czech Law MCP
<!-- ANSVAR-CTA-BEGIN -->
> **The Czech law corpus is now served through the Ansvar Gateway.** Connect your AI assistant (Claude, Copilot, Cursor, custom MCP client) to `https://gateway.ansvar.eu/mcp` — one OAuth connection, free tier available, covering this corpus plus EU regulations, national law across 28 audited jurisdictions, and CVE/security intelligence, every result with a verbatim source citation. Start at https://ansvar.eu/docs/quickstart
### Connect
**Claude Code** (one line):
```bash
claude mcp add ansvar --transport http https://gateway.ansvar.eu/mcp
```
**Claude Desktop / Cursor** — add to `claude_desktop_config.json` (or `mcp.json`):
```json
{
"mcpServers": {
"ansvar": {
"type": "url",
"url": "https://gateway.ansvar.eu/mcp"
}
}
}
```
**Claude.ai** — Settings → Connectors → Add custom connector → paste `https://gateway.ansvar.eu/mcp`
First request opens an OAuth signup flow (setup details: [ansvar.eu/docs/quickstart](https://ansvar.eu/docs/quickstart)). After signup, your client is bound to your account; tier (free / premium / team / company) determines fan-out, quota, and which downstream MCPs are reachable.
---
## Self-host this MCP
You can also clone this repo and build the corpus yourself. The schema,
fetcher, and tool implementations all live here. What is not in the repo is
the pre-built database — TDM and standards-licensing constraints on the
upstream sources mean we host the corpus on Ansvar infrastructure rather
than redistribute it as a public artifact.
Build your own: run this repo's ingestion script (entry-point varies per
repo — typically `scripts/ingest.sh`, `npm run ingest`, or `make ingest`;
check the repo root).
<!-- ANSVAR-CTA-END -->
MCP server for Czech Law — 45,899 statutes from www.e-sbirka.cz.
[](LICENSE)
[](https://modelcontextprotocol.io)
[](#coverage)
## What this is
This server indexes the legal materials listed under **Sources** below and
exposes them via the Model Context Protocol. Part of the Ansvar MCP fleet —
source-available servers published for self-hosting.
It makes no outbound network calls except to the upstream sources during
ingestion — no analytics, no phone-home.
## Coverage
- **Corpus:** Czech Law — 45,899 statutes, 461,231 provisions
- **Jurisdiction code:** `CZ`
- **Corpus snapshot:** 2026-02-22
The corpus is rebuilt from the upstream sources by the included ingestion script; re-run periodically to refresh.
See **Sources** below for source URLs, terms, and reuse conditions.
## Why this exists
LLMs answering compliance, security, or legal questions from training data
alone will fabricate citations — confidently producing article numbers,
statute names, and source URLs that do not exist, or that do not say what
the model claims. This MCP exists so an agent can call a tool that returns
the real text, the real identifier, and the real source URL straight from
the indexed materials — and ground an answer rather than recall it.
One MCP, one corpus. The point is composition.
The **Ansvar Gateway** ([ansvar.eu](https://ansvar.eu)) joins this MCP
with the rest of the Ansvar fleet behind a single authenticated
endpoint — 300+ servers covering legal jurisdictions, EU
regulations, security frameworks, sector regulators, privacy-pattern
catalogues, and risk-scoring tools. That lets an agent run cross-domain
workflows that no single MCP can serve alone:
- **Threat model and TARA.** Threat enumeration → known component
vulnerabilities → severity scoring → applicable AI, cybersecurity, and
automotive obligations → privacy threats. Every finding traceable to
its source.
- **Gap analysis.** Target framework requirements → current-state
evidence → unmet obligations → remediation guidance and authority
opinions. Every gap traceable to the specific requirement that flagged
it.
- **Data Protection Impact Assessment.** Privacy regulation articles →
national DPA guidance → privacy-pattern catalogue → applicable case
law.
### Getting high-quality citations
Citation accuracy degrades when an agent's context fills up. Long inputs
cause retrieval-stage drift — the model recalls claim text correctly but
misattributes the source. Two practices keep accuracy high:
1. **Focused first pass, checking-agent second pass.** Query a small,
relevant set of MCPs first, then run a separate agent whose only job
is to re-resolve each citation against the source MCP and flag any
that no longer match. The checking agent uses the same MCP tools as
the synthesis agent.
2. **Pull the source text verbatim when in doubt.** Every citation an
agent emits points back to a tool call against this server. You — or
another agent — can call the same tool with the same identifier and
read the raw statute, article, or standard text directly. If the
verbatim text doesn't support what the agent claimed, the citation
was misused, regardless of whether the identifier was real.
Both patterns work the same way self-hosted or through the gateway.
## Two ways to use it
**Self-host (free, Apache 2.0)** — clone this repo, run the ingestion script to build your local database from the listed upstream sources, point your MCP client at the local server. Instructions below.
**Use the hosted gateway** — for production use against the curated,
kept-fresh corpus across the full Ansvar MCP fleet, with citation enrichment
and multi-jurisdiction fan-out — see [ansvar.eu](https://ansvar.eu).
## Self-hosting
### Install
```bash
git clone https://github.com/Ansvar-Systems/Czech-law-mcp.git
cd Czech-law-mcp
npm install
```
### Build the database
```bash
npm run build:db
```
Ingestion is a snapshot — your local copy goes stale until you re-run it. The hosted gateway corpus is refreshed continuously.
### Premium tier (case-law)
The premium tier extends the free corpus with curated Supreme Court decisions from the **Sbírka soudních rozhodnutí a stanovisek** published at [sbirka.nsoud.cz](https://sbirka.nsoud.cz). License basis is the same Czech-Statutory-PD §3 carve-out that covers statutes — court decisions are excluded from copyright protection under Czech Copyright Act 121/2000 Coll.
Build the premium database in two steps. First, ingest the case-law corpus (single-threaded, ≥ 2 seconds per request, honouring `robots.txt`):
```bash
npm run ingest:nsoud-sbirka # full corpus (~9,790 decisions, ~6 hours)
npm run ingest:nsoud-sbirka -- --limit 100 # smoke test (200 seconds)
npm run ingest:nsoud-sbirka -- --resume # skip already-ingested URLs
```
Seed files land under `data/case-law-seed/{ns-sbirka-<id>}.json`. Then build the premium database, which combines the e-Sbírka statute corpus with the case-law seeds:
```bash
npm run build:db:premium
```
The premium build writes to `data/database-premium.db` (~1.3 GB statutes + case-law growth). Case-law rows are stored in the same `legal_documents` table with `type='case_law'`, `publisher='Nejvyšší soud'`, `license='Czech-Statutory-PD'`. Cited statutes parsed from each decision's `Předpisy` field land in `cross_references`.
The full Supreme Court decision search at `rozhodnuti.nsoud.cz` is out of scope — that subdomain blocks all non-DG_JUSTICE_CRAWLER user-agents via `robots.txt` and requires a separate written exception from NS IT. The Sbírka collection is the curated, publication-grade subset.
### Configure your MCP client
```json
{
"mcpServers": {
"czech-law-mcp": {
"command": "node",
"args": ["dist/index.js"]
}
}
}
```
## Sources
| Source | Source URL | Terms / license URL | License basis | Attribution required | Commercial use | Redistribution / caching | Notes |
|---|---|---|---|---|---|---|---|
| [www.e-sbirka.cz](https://www.e-sbirka.cz) | https://www.e-sbirka.cz | [Czech Copyright Act 121/2000 §3](https://www.e-sbirka.cz/eli/cz/sb/2000/121/) | `Czech-Statutory-PD` — Czech Copyright Act 121/2000 Coll. §3 excludes "úřední dílo" (official works) from copyright protection | Yes | Yes | Yes | Free tier. Same statutory carve-out mechanism as US-Federal-PD (17 USC §105) and Norwegian-Court-Publication. Czech transposition of EU Open Data Directive 2019/1024 (Act 261/2021 Coll.) provides supplementary basis. Catalogued upstream as `Czech-Statutory-PD` (entry_kind: regime). |
| [sbirka.nsoud.cz](https://sbirka.nsoud.cz) | https://sbirka.nsoud.cz/sbirka/{id}/ | [Czech Copyright Act 121/2000 §3](https://www.e-sbirka.cz/eli/cz/sb/2000/121/) | `Czech-Statutory-PD` — same úřední dílo carve-out applied to court decisions | Yes | Yes | Yes | Premium tier (Wave A). Curated Supreme Court decisions (Sbírka soudních rozhodnutí a stanovisek). `robots.txt` allows full crawl with no Crawl-Delay; ingestion is single-threaded at ≥ 2 s per request. Full Supreme Court search at `rozhodnuti.nsoud.cz` blocks non-DG_JUSTICE_CRAWLER agents and is out of scope. |
## What this repository does not provide
This repository's source — the MCP server code, schema, and ingestion script — is licensed under Apache
2.0. The license below covers the code in this repository only; it does not
extend to the upstream legal materials.
Running ingestion may download, cache, transform, and index materials from the listed upstream sources. You are responsible for confirming that your use of those materials complies with the source terms, attribution requirements, robots/rate limits, database rights, copyright rules, and any commercial-use or redistribution limits that apply in your jurisdiction.
## License
Apache 2.0 — see [LICENSE](LICENSE). Commercial use, modification, and
redistribution of **the source code in this repository** are permitted under
that license. The license does not extend to upstream legal materials downloaded by the ingestion script; those remain governed by the source jurisdictions' own publishing terms (see Sources above).
## The Ansvar gateway
If you'd rather not self-host, [ansvar.eu](https://ansvar.eu) provides this
MCP plus the full Ansvar fleet through a single authenticated endpoint, with
the curated production corpus, multi-MCP query orchestration, and citation
enrichment.
---
Issues: [github.com/Ansvar-Systems/Czech-law-mcp/issues](https://github.com/Ansvar-Systems/Czech-law-mcp/issues) · Security: <security@ansvar.eu>