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Hopi
uk.co.hopi/hopi in the official MCP registry.
Endpoint https://mcp.hopi.co.uk/mcp.
The registry describes it as: Free UK calculators, converters and validators (tax, VAT, stamp duty, dates, units), read-only.
On 2026-10-30 we read its 200 tools, but part of what it advertised was cut before our rules saw it: a description or schema past the size we read, more tools than we read, or a tool list split across pages. Nothing in the part we read matched, but the rest was not checked: this is not a clean result.
Tools it advertises
hopi_add_working_days hopi_age_calculator hopi_ai_prompt_builder hopi_alcohol_unit_calculator hopi_alphabetical_order hopi_angle_converter hopi_area_converter hopi_aspect_ratio_calculator hopi_average_calculator hopi_base32_encoder hopi_base64 hopi_bill_splitter hopi_bingo_card_generator hopi_bitcoin_address_validator hopi_bmi_calculator hopi_body_fat_calculator hopi_caesar_cipher hopi_cagr_calculator hopi_calories_to_kj hopi_case_converter hopi_cat_age_calculator hopi_celsius_to_fahrenheit hopi_character_counter hopi_cipher_identifier hopi_cm_to_feet hopi_cmyk_to_rgb hopi_coin_flip hopi_colour_name_finder hopi_colour_palette_generator hopi_colour_picker hopi_colour_shades_generator hopi_combination_generator hopi_compound_interest_calculator hopi_contrast_checker hopi_cron_expression_parser hopi_crypto_profit_calculator hopi_css_gradient_generator hopi_css_minifier hopi_csv_to_json hopi_cups_to_grams hopi_currency_converter hopi_data_size_converter hopi_date_calculator hopi_day_of_week_calculator hopi_day_rate_calculator hopi_days_between_dates hopi_days_until_christmas hopi_dca_calculator hopi_dice_roller hopi_diff_checker hopi_discount_calculator hopi_dog_age_calculator hopi_download_time_calculator hopi_due_date_calculator hopi_dummy_data_generator hopi_email_header_analyser hopi_email_link_generator hopi_emoji_remover hopi_energy_cost_calculator hopi_env_to_json and 140 more
Rather than checking back: subscribe to this server's tool changes (a feed, no account and no address needed). Tool names and dates only, never what a tool says.
Run this server? Show the check in your README
The badge reflects the latest read: 
[](https://lazaretto.dev/mcp-registry/uk-co-hopi-hopi)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. How tool poisoning works. What we found across the registry. Check another server.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.