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MaCalculatriceEnLigne
io.github.tresor4k/macalc-mcp in the official MCP registry.
Endpoint https://macalculatriceenligne.com/api/mcp. Source: github.com/tresor4k/macalc-mcp.
The registry describes it as: Calculatrices francaises : salaire net, SMIC, impots, bareme kilometrique, TVA, conversions.
We read its 200 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
list_bundles get_bundle_tools calculate_french_income_tax calculate_french_salary calculate_french_vat calculate_mortgage calculate_compound_interest calculate_simple_interest calculate_loan_payment calculate_break_even calculate_profit_margin calculate_roi calculate_discount calculate_vat_generic calculate_cost_price calculate_debt_to_income calculate_inflation_adjustment calculate_purchasing_power calculate_percentage calculate_average calculate_pythagoras calculate_area calculate_volume calculate_perimeter calculate_gcd_lcm calculate_equation calculate_sequence calculate_fraction calculate_logarithm calculate_factorial_permutation calculate_trigonometry calculate_base_converter convert_temperature convert_distance convert_weight convert_volume convert_area convert_speed convert_pressure convert_data_storage convert_energy convert_angle convert_time convert_fuel_consumption convert_cooking convert_shoe_size calculate_grade_average calculate_probability_binomial calculate_statistics calculate_rule_of_three calculate_unit_price calculate_tip calculate_brevet_points calculate_bac_points calculate_ects_credits calculate_parcoursup_points calculate_life_path_numerology calculate_chinese_zodiac calculate_biorhythm calculate_age_in_units and 140 more
Run this server? Show the check in your README
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[](https://lazaretto.dev/mcp-registry/io-github-tresor4k-macalc-mcp)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.