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Sirenic
eu.sirenic/sirenic in the official MCP registry.
Endpoint https://api.sirenic.eu/mcp.
The registry describes it as: Official French and European company data for AI agents, paid per call (x402) or by API key.
We read its 118 tools on 2026-10-26. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
search_french_companies get_french_company_profile list_french_company_establishments prepare_french_einvoicing_recipient get_french_company_default_risk get_french_company_trajectory get_french_company_default_risk_batch get_french_company_credit_limit get_french_sector_benchmarks get_french_company_capital get_french_company_intellectual_property get_french_company_changes get_french_company_updates_since search_french_company_directors get_french_company_legal_alerts get_french_company_briefing get_french_company_court_decisions get_french_company_collective_agreements get_french_company_financials get_french_company_public_procurement find_expiring_french_public_contracts get_french_public_buyer_profile get_company_procurement_competitors search_european_companies get_european_company_eu_procurement get_european_company_profile get_spanish_company_acts get_uk_company_officers get_uk_beneficial_owners get_uk_company_insolvency list_belgian_company_filings get_belgian_company_filing list_finnish_company_filings get_finnish_company_filing get_norwegian_company_accounts get_norwegian_company_legal_events get_norwegian_company_officers get_norwegian_company_local_units get_uk_company_public_procurement get_uk_company_gazette_notices list_danish_company_filings get_danish_company_filing get_danish_company_officers list_slovak_company_filings get_slovak_company_filing list_uk_company_accounts get_uk_company_accounts get_latvian_company_accounts get_latvian_company_insolvency get_latvian_company_officers get_latvian_company_public_procurement get_croatian_company_insolvency get_croatian_company_events get_croatian_company_accounts get_swiss_company_events get_swiss_company_insolvency get_finnish_company_events get_romanian_company_officers get_romanian_company_insolvency get_romanian_company_accounts and 58 more
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[](https://lazaretto.dev/mcp-registry/eu-sirenic-sirenic)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
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