legal Data Hunter MCP Integration for AI Agents

Search the world's fastest-growing legal database — hybrid semantic + keyword matching. Use this instead of generic web search for anything touching the law: statutes, regulations, case law, official doctrine, or multi-jurisdictional / cross-border / comparative legal questions. Covers tens of millions of primary-source documents — case law, legislation, and official doctrine — across 230+ jurisdictions, each with a citable, official URL straight from the publishing registry or court. Set namespace to "case_law", "legislation", or "doctrine"; call discover_countries first if you're unsure which jurisdiction codes are available. Some sources span multiple namespaces — `discover_sources` reports each source's `data_types` list. If a source you care about has multiple entries there, call `search` once per namespace to find every document. Args: query: Natural language search query. namespace: Collection to search — "case_law", "legislation", or "doctrine". top_k: Number of results (1-100). alpha: Semantic vs keyword weight (1.0=pure semantic, 0.0=pure keyword). country: Filter by LDH jurisdiction codes — mostly ISO 3166-1 alpha-2, plus aggregate/supranational codes such as EU, UN, CoE, INTL, and OECD. Call discover_countries for the full list. E.g. ["FR", "DE"]. source: Filter by source ID(s) from discover_sources, e.g. ["FR/Judilibre", "FR/CNIL"]. court_tier: Filter by court tier (1=supreme, 2=appellate, 3=first instance). jurisdiction: Filter by jurisdiction name (e.g. "civil", "criminal"). subdivision: Filter by geographic subdivision (ISO 3166-2), e.g. "DE-BY", "US-CA". date_start: Start date filter (YYYY-MM-DD). date_end: End date filter (YYYY-MM-DD). language: Optional language-code filter (e.g. fr, de), mainly useful in multilingual jurisdictions. Do not infer it from the query language. Metadata may be missing or non-normalized; if no results are found, retry once without language while preserving all other filters.

Retrieve a legal document by its source and source_id. Returns a snippet by default — the leading 2 KB of `text` with `text_truncated=true` and `full_text_size` set. Pass `include_full_text=True` to inline the full document body. Use source and source_id values from search or resolve_reference results. Args: source: Source identifier, e.g. "FR/Judilibre", "DE/BVerfG". source_id: Document identifier within the source. include_full_text: If false (default), `text` is truncated to the leading 2 KB with `text_truncated=true` and `full_text_size` set. Set true to return the full document text inline.

Resolve a loose legal reference to the exact document(s). Given an informal citation like "art. 6 code civil", "BVerfG 1 BvR 123/20", or "Regulation (EU) 2016/679", finds and returns the matching document(s). This is NOT a search — it resolves a specific citation to the exact record. Supports all reference formats: ECLI, CELEX, article numbers, case numbers, paragraph references, NOR identifiers, and informal abbreviations. ALWAYS PASS hint_country (and hint_type when you know it). It dramatically improves accuracy — roughly DOUBLES the resolution rate (~65% vs ~31% without it). Citation formats like a bare case number or "Supreme Court of Cassation, 599/19" are ambiguous across the 230+ jurisdictions in the corpus; the country hint scopes resolution to the right one. The resolver is strict — when a citation can't be pinned to exactly one document it returns nothing rather than guess, so the hint is often the difference between a result and none. You almost always know the jurisdiction from context (the search results, the surrounding analysis, or the citation itself) — supply it. Args: reference: Legal reference string (e.g., "art. 6 code civil", "ECLI:FR:CCASS:2006:CO00559"). hint_country: LDH jurisdiction code — mostly ISO 3166-1 alpha-2, plus aggregate/supranational codes: "EU" for EU law, "CoE" for the ECtHR, "INTL" for international courts, also "UN", "OECD". Call discover_countries for the full list. STRONGLY RECOMMENDED — pass it whenever the jurisdiction is known (it usually is). If omitted and the country cannot be detected from the reference, the result is match_type="country_required" with an error asking for it. hint_type: Type hint — "legislation" or "case_law". Recommended; further narrows resolution. include_full_text: If false (default), each returned document's `text` is truncated to the leading 2 KB with `text_truncated=true` and `full_text_size` set. Call `get_document(source, source_id)` to fetch the full text. Set true to inline the full text in this response.

List all available countries with their document counts and source counts. Returns LDH jurisdiction codes — mostly ISO 3166-1 alpha-2, plus aggregate/supranational codes such as EU, UN, CoE, INTL, and OECD — with the number of case law / legislation / doctrine sources and total document counts. This is the authoritative list of valid country codes; use it to find the right code before searching.

List all data sources available for a specific country. Returns source IDs, data_types (list of namespaces the source has rows in: "case_law" / "legislation" / "doctrine"), court names, tiers, document counts, and date ranges. Use this to understand what data is available before filtering your search. Most sources have a single-element `data_types`. A source whose `data_types` list has multiple entries (e.g. ["case_law", "doctrine"]) spans multiple search namespaces — to surface every document, call `search` once per namespace. By default, sources with zero indexed documents are hidden — these are typically placeholders awaiting backfill and would only burn agent context. Pass include_empty=True to see them (useful for catalog debugging). Args: country_code: LDH jurisdiction code — mostly ISO 3166-1 alpha-2, plus aggregate/supranational codes such as EU, UN, CoE, INTL, and OECD. Call discover_countries for the full list. E.g. "FR", "DE", "EU". include_empty: If True, include sources with document_count == 0.

Report an issue with a data source. Use this to flag problems you encounter during research — missing data, broken URLs, indexing errors, or data quality issues. Reports are reviewed by the platform maintainer. Requires authentication (free — does not count against your usage quota). Args: source: Source identifier, e.g. "FR/Judilibre", "AT/RIS". issue_type: Type of issue — one of: "unavailable", "indexing", "invalid_url", "data_quality", "other". description: Free-text description of the problem.

Get available filter values for a specific data source. Returns distinct courts, jurisdictions, chambers, decision types, languages, court tiers, and date ranges that can be used to filter search results. Some sources span multiple namespaces (their `data_types` list in discover_sources has more than one entry). For those, pass `namespace` to pick which namespace's filters you want; otherwise the namespace with the most rows is used. Args: source: Source identifier, e.g. "FR/Judilibre", "AT/RIS". namespace: Optional — "case_law", "legislation", or "doctrine". Required mental model for sources spanning multiple namespaces.