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mcp-eu-sparql MCP server · C · ToolBench

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mcp-eu-sparql

github.com/matematicsolutions/mcp-eu-sparql

MCP server - EU legislation and CJEU case law via Publications Office SPARQL (Cellar / EUR-Lex)

2026-07-28+STDIO5 tools

61/100

Definition Quality77

Protocol Readiness50

Supportability43

Spec posture

Inferred effective spec 2026-07-28+·current baseline 2026-07-28

Static source inference · medium confidence · evidence: stateless requests

Current-spec patterns detected

Summary

Five tools with complete input schemas and descriptions in Polish. All tools are READ_ONLY search/discovery operations with proper enum constraints (lang, document_type). Descriptions are detailed (150-400 chars) and explain WHEN to use each tool. However, output schemas are not explicitly documented in the source, only inferred from format.ts helper functions. Parameter descriptions are thorough but could be more concise. No error recovery guidance in descriptions. Tool names follow verb_noun pattern (search_*) appropriately.

Tools (5)

search_by_celexread onlysource verified78/100

Znajdz akt prawny UE lub orzeczenie CJEU po numerze CELEX. Numer CELEX jest unikalny i identyfikuje dokument niezaleznie od jezyka. Przyklady: 32016R0679 (RODO), 31995L0046 (uchylona dyrektywa o ochronie danych), 62018CJ0311 (wyrok Schrems II). Zwraca tytul w wybranym jezyku, ECLI (dla case-law) i EUR-Lex URL.

search_by_date_rangeread onlysource verified78/100

Znajdz akty prawne UE z zakresu dat (po dacie dokumentu). Opcjonalnie filtruj po typie (REG=rozporzadzenie, DIR=dyrektywa, DEC=decyzja, RECO=zalecenie, OPIN=opinia). Maks. 50 wynikow na zapytanie. Uzyteczne do przegladu aktow z konkretnego okresu legislacyjnego.

search_cjeuread onlysource verified75/100

Orzeczenia Trybunalu Sprawiedliwosci UE: wyroki (JUDG, 34 tys.), postanowienia (ORDER, 8 tys.), opinie rzecznikow generalnych (OPIN_AG, 14 tys.). Opcjonalny zakres dat, typ dokumentu i `query` (keyword w tytule - tytul CJEU zawiera strony, sygnature i slowa kluczowe wyroku). Format CELEX dla CJEU: 6 + rok + kod (CJ=wyrok C, CO=postanowienie, CC=opinia AG) + nr sprawy (np. 62018CJ0311).

search_cjeu_by_ecliread onlysource verified78/100

Orzeczenie CJEU po identyfikatorze ECLI (np. ECLI:EU:C:2020:559 = Schrems II). Zwraca CELEX, date, tytul (strony + sygnatura + slowa kluczowe).

search_gdprhubread onlysource verified75/100

Pelnotekstowe wyszukiwanie w GDPRhub (gdprhub.eu, projekt noyb) - decyzje krajowych organow ochrony danych z calej UE + komentarze do artykulow RODO. UWAGA licencja tresci: CC BY-NC-SA 4.0 (niekomercyjna, share-alike) - kazda citation niesie pole `license` - przy wykorzystaniu tresci (nie samego linku) uprzedz uzytkownika o ograniczeniu NC.

Issues (5)

HIGHtool-output-schema ↗

Output schemas not documented in tool definitions. Responses are inferred from format.ts (buildCitations, buildGdprhubCitations) but not declared in CallToolRequestSchema. LLMs cannot predict response structure without explicit schema documentation.

search_by_celexsearch_by_date_rangesearch_cjeusearch_cjeu_by_eclisearch_gdprhub

MEDIUMrecovery-guide ↗

No error recovery guidance in tool descriptions. When SPARQL endpoint fails or returns no results, descriptions do not suggest fallback strategies (e.g., 'If no results, try search_cjeu with broader date range'). Agents cannot self-correct.

search_by_celexsearch_by_date_rangesearch_cjeusearch_cjeu_by_ecli

MEDIUMtool-description ↗

Descriptions are in Polish only. While domain-appropriate, descriptions should be in English for international LLM compatibility. Polish descriptions may confuse non-Polish-speaking agents or cause encoding issues.

search_by_celex

Recommendations

Add explicit output schema documentation to each tool definition. Example: 'Returns { citations: [{ title, url, celex?, ecli?, publication_date?, document_type?, license? }], total_count }'. This enables LLMs to plan downstream operations.
Translate tool descriptions and parameter descriptions to English. Keep Polish examples in descriptions but use English for the primary docstring. This improves compatibility with non-Polish LLM deployments.
Add recovery guidance to descriptions. E.g., search_by_celex: 'If CELEX not found, try search_by_date_range with the document's publication year.' This guides agent fallback strategies.
Add toolAnnotations to tool definitions: mark all five tools with readOnlyHint=true to signal to agents that these are safe, non-destructive operations that can be retried without side effects.
Enhance search_gdprhub with offset/cursor pagination. Add 'offset' parameter (default 0) and return 'next_offset' in response to support multi-page result traversal without context explosion.

Score history

Overall score trend

First recorded score · v2 rubric

61/100

Scored	Grade	Overall	Spec posture	Rubric
2026-09-23	C	61	2026-07-28+	v2