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IUSTORIA – průvodci a právní kalkulačky
cz.iustoria/pruvodci in the official MCP registry.
Endpoint https://www.iustoria.cz/mcp.
The registry describes it as: Czech legal calculators, document templates, legal glossary and lawyer-reviewed guides.
We read its 39 tools on 2026-10-28. 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
promlceni soudni_poplatky naklady_sporu uroky lhuta srazky_ze_mzdy exekutorsky_tarif dovolena prumerny_vydelek nahrada_mzdy_pri_nemoci minimalni_mzda_a_priplatky dpp_dpc cestovni_nahrady_zamestnance danove_sankce danovy_kalendar dph osvobozeni_prijmu_z_prodeje dar_a_dedictvi_dan ucetni_jednotka danove_odpisy zalohy_osvc nemocenska lhuty_v_pojisteni podpojisteni dedicke_podily konec_pracovniho_pomeru podpora_v_nezamestnanosti odmena_insolvencniho_spravce cestovne_advokata odmena_advokata vzor_info vzor_formular hledat_v_pruvodcich nacist_stranku souvisejici pojem zneni_predpisu poptavka poptavka_odeslat
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[](https://lazaretto.dev/mcp-registry/cz-iustoria-pruvodci)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.