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Xearno Tools

tools.xearno/calculators in the official MCP registry. Endpoint https://xearno.tools/mcp.

The registry describes it as: Money, tax & business calculators kept current with 2026 rules — plus operator insights.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

claude mcp add --transport http calculators https://xearno.tools/mcp

{
  "mcpServers": {
    "calculators": {
      "url": "https://xearno.tools/mcp"
    }
  }
}

code --add-mcp '{"name":"calculators","type":"http","url":"https://xearno.tools/mcp"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which.

Let Claude Code check servers as it adds them

With the free lazaretto-guard plugin installed, when Claude Code adds a server for you or writes one into an MCP config, the plugin reads the server's tools first and asks you if one of our rules matches. Install it, restart Claude Code, then ask it to run the command above.

claude plugin marketplace add jamesdfinance-dev/lazaretto-plugins
claude plugin install lazaretto-guard@lazaretto-plugins

Tools it advertises

income_tax us_aca_subsidy_cliff us_student_loan_rap_vs_ibr uk_statutory_redundancy_pay uk_notice_pay netherlands_30_percent_ruling portugal_ifici_nhr_checker thailand_social_security uk_statutory_residence_test us_substantial_presence_test ny_statutory_residence_checker uk_stamp_duty_sdlt singapore_property_stamp_duty us_raise_benefits_cliff income_tax_hong_kong hong_kong_profits_tax income_tax_singapore income_tax_netherlands china_severance china_retirement_pension australia_hecs_help_repayment uk_capital_gains_tax india_gratuity creator_platform_payout us_freelance_vs_employee us_self_employment_quarterly_taxes uk_first_year_self_assessment singapore_platform_worker_cpf compound_growth savings_goal loan_payment fire_number split_bill unit_price true_hourly_wage steady_paycheck quit_runway china_income_tax_salary china_social_insurance uk_redundancy_package us_estate_tax_exemption uk_car_tax_ved mexico_vacaciones_aguinaldo saudi_end_of_service germany_elterngeld uk_child_benefit_charge uk_universal_credit_taper uae_gratuity app_store_developer_fees korea_parental_leave_benefit france_conges_arret_maladie japan_childcare_leave_benefit apr_to_apy price_in_hours mortgage car_loan emi sip credit_card_payoff home_affordability and 12 more

Tool changes

We compare every full read of this server with the one before. No change in what its tools say has been seen since we started keeping this record on 2026-10-30.

Fingerprint of its tools at our last full read (2026-10-31): 071fa422eca5f90c. A client can hash the tools it is served the same way and compare; the full value and a hash per tool are in this page as JSON.

Run this server? Show the check in your README

The badge reflects the latest weekly read:

[![MCP tool check](https://lazaretto.dev/mcp-registry/tools-xearno-calculators/badge.svg)](https://lazaretto.dev/mcp-registry/tools-xearno-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.