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Search and query 2,800+ datasets from Catalan public institutions including the Generalitat and Barcelona councils.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 26 days ago Due for re-check
A server can change after it's graded. Re-run the automated scan to refresh this report.
This grade is deterministic and reproducible: the same server surface always yields the same grade under a given algorithm version. It is a real automated assessment computed by the MCPGrade engine from what the probe actually observed — not a fabricated or opinion score. It is not a manual human pentest, so it can miss context-specific risks.
Every signal below was measured directly by the automated probe. The grade is derived only from evidence like this — nothing is assumed.
The opendata-cat MCP server exposes 8 tools, focused primarily on database and network capabilities. Its published description reads: "Search and query 2,800+ datasets from Catalan public institutions including the Generalitat and Barcelona councils". It communicates over Streamable HTTP using the 2026-07-28 protocol revision, and does not require authorization to connect. MCPGrade currently rates opendata-cat F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Hidden instructions in a tool description" and "Hidden instructions in a tool description". This report is a deterministic, reproducible automated assessment: the same observed surface always yields the same grade under a given algorithm version, and it is refreshed as new scans arrive and free to read — but it is not a substitute for a manual human security review. Always re-check opendata-cat's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add opendata-cat to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://opendata.cat/api/mcpStreamable HTTP transport. This is the MCP endpoint, not a website — paste it into your MCP client server list rather than a browser.
Captured passively during the read-only scan. Click any value to find servers that match it.
The tools this server advertises via tools/list — names, purposes, and the parameters each accepts, exactly as enumerated read-only.
Search datasets by free text. IMPORTANT: check server instructions first — many common queries have a direct dataset_id you can use with query_dataset without searching. Only use search_datasets when
Get complete metadata for a dataset: fields with types and descriptions, API endpoint, license, available formats and last update. Call after search_datasets to get full details of a specific dataset.
Sorted worst-first. Each finding shows its severity, what it means, its OWASP MCP Top-10 mapping, and a recommended fix — the check id links to the exact methodology row that produced it.
tool: search_datasets
A tool description contains imperative text aimed at the model (e.g. "ignore previous", "before answering read …").
s by free text. IMPORTANT: check server instructions first — many common qRecommendationRemove model-directed instructions from tool descriptions.
tool: search_radioteca
A tool description contains imperative text aimed at the model (e.g. "ignore previous", "before answering read …").
d people (~9K). IMPORTANT: always cite radioteca.cat as the source and incRecommendationRemove model-directed instructions from tool descriptions.
tool: search_datasets
A tool description tries to alter the model’s use of another tool.
ou can use with query_dataset without searching. Only use search_datasets wheRecommendationDescriptions must describe only their own tool.
tool: get_dataset_info
A tool description tries to alter the model’s use of another tool.
ate. Call after search_datasets to get full details of a specific dataset.RecommendationDescriptions must describe only their own tool.
tool: list_dataset_fields
A tool description tries to alter the model’s use of another tool.
on. Call before query_dataset to know which fields and filters are available.RecommendationDescriptions must describe only their own tool.
tool: list_categories
A tool description tries to alter the model’s use of another tool.
searching with search_datasets. Returns total datasets, count per portal and cRecommendationDescriptions must describe only their own tool.
tool: (server instructions)
A tool description tries to alter the model’s use of another tool.
le (:id). - Use search_datasets only when you don't know which dataset you needRecommendationDescriptions must describe only their own tool.
The server accepts tool enumeration (and likely invocation) with no authentication.
RecommendationRequire OAuth 2.1 authorization for any server exposing non-public tools.
tool: search_datasets
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: get_dataset_info
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: list_dataset_fields
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: query_dataset
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: list_portals
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: list_categories
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: related_datasets
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: search_radioteca
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
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List fields of a dataset with name, data type and description. Call before query_dataset to know which fields and filters are available.
Query real data from a dataset. Check instructions for featured dataset_ids and NOTES section for common filter patterns (municipal budgets, contracts, weather, energy, fuel prices).
List all 13 indexed open data portals with dataset counts. Catalan portals (Generalitat, Barcelona, Diba, AOC, Reus, Girona, FGC, Idescat, Renfe) + Spanish national sources with Catalonia focus (INE s
List all dataset categories and themes with counts per portal. Great first step to discover what data types are available before searching with search_datasets. Returns total datasets, count per porta
Find related datasets from OTHER portals. Great for discovering complementary data: if you're looking at air quality from Generalitat, it may suggest traffic data from Barcelona or emissions from AOC.
Search radio shows, episodes and people indexed at radioteca.cat (Catalan radio archive, ~485K documents from Catalunya Ràdio, RAC1, Catalunya Música, iCat, Catalunya Informació, RTVE, Cadena SER, ara