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com.calcfleet/calculators
com.calcfleet/calculators in the official MCP registry.
Endpoint https://calcfleet.com/api/mcp.
The registry describes it as: Tested financial & practical calculators as free, no-auth MCP tools for AI agents.
We read its 122 tools on 2026-10-26. Nothing in them matched our tool-poisoning rules.
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
mortgage_overpayment_calculator debt_payoff_calculator freelance_hourly_rate_calculator compound_interest_calculator savings_goal_calculator car_loan_calculator break_even_calculator margin_markup_calculator rent_vs_buy_calculator fire_calculator take_home_pay_calculator student_loan_calculator apy_calculator roi_calculator loan_amortization_calculator paint_calculator mortgage_refinance_calculator tdee_calculator macro_calculator running_pace_calculator rent_affordability_calculator closing_cost_calculator mortgage_points_calculator home_affordability_calculator down_payment_calculator mortgage_piti_calculator balance_transfer_calculator heloc_calculator debt_consolidation_calculator credit_card_payoff_calculator personal_loan_calculator dti_calculator saas_mrr_growth_calculator cac_ltv_calculator roas_calculator churn_rate_calculator payback_period_calculator burn_rate_runway_calculator product_pricing_calculator sales_tax_calculator amazon_fba_calculator etsy_fee_calculator ecommerce_profit_margin_calculator solar_panel_savings_calculator solar_system_size_calculator electricity_cost_calculator ev_charging_cost_calculator heat_pump_savings_calculator home_battery_size_calculator car_affordability_calculator car_lease_calculator lease_vs_buy_car_calculator car_depreciation_calculator cost_per_mile_calculator gas_vs_electric_car_calculator flooring_calculator tile_calculator concrete_calculator drywall_calculator deck_boards_calculator and 62 more
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/com-calcfleet-calculators)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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