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TidyData Tools
io.github.tidydata-dev/tidydata in the official MCP registry.
Endpoint https://tidydata-api.tidydata.workers.dev/mcp. Source: github.com/tidydata-dev/tidydata-mcp.
The registry describes it as: Holidays, business days, currency, time zones, DNS/WHOIS, web page checks, geodata and text tools.
We read its 49 tools on 2026-10-22. 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
public_holidays is_public_holiday business_days_between add_business_days convert_currency exchange_rates convert_time_zone timezone_by_coordinates sunrise_sunset moon_phase convert_calendar_date dns_lookup dns_propagation domain_whois domain_availability check_url_status expand_short_url link_preview website_technologies seo_audit security_headers_check extract_links extract_html_tables sitemap_urls robots_txt_check ip_lookup validate_iban country_info airport_info airport_search airport_distance city_search reverse_geocode distance_between_places postal_code_lookup nutrition_search nutrition_calculate decode_vin dictionary_define synonyms rhymes spell_check summarize extract_keywords detect_language loan_calculator convert_units hash_text generate_password
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[](https://lazaretto.dev/mcp-registry/io-github-tidydata-dev-tidydata)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.