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EveryCalc

xyz.everycalc/every-calc in the official MCP registry. Endpoint https://everycalc.xyz/mcp. Source: github.com/xOyabunx/everycalc.

The registry describes it as: 69 free finance, military, school and everyday calculators as MCP tools.

Connect it

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

claude mcp add --transport http every-calc https://everycalc.xyz/mcp

{
  "mcpServers": {
    "every-calc": {
      "url": "https://everycalc.xyz/mcp"
    }
  }
}

code --add-mcp '{"name":"every-calc","type":"http","url":"https://everycalc.xyz/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

calculate_mortgage calculate_refinance calculate_affordability calculate_loan calculate_compound_interest calculate_percentage calculate_tip calculate_salary calculate_age calculate_auto_loan calculate_date_duration calculate_debt_payoff calculate_inflation calculate_rent_vs_buy calculate_roth_vs_traditional calculate_unit_converter calculate_word_counter calculate_401k calculate_arm_vs_fixed calculate_biweekly_mortgage calculate_bmi_tdee calculate_capital_gains_tax calculate_car_affordability calculate_credit_card_payoff calculate_emergency_fund calculate_income_tax_estimator calculate_lease_vs_buy calculate_net_worth calculate_paycheck calculate_property_tax_estimator calculate_raise_vs_inflation calculate_retirement_savings_planner calculate_roth_conversion calculate_sba_loan calculate_social_security_estimator calculate_aft calculate_bah calculate_brs_vs_high3 calculate_gi_bill calculate_les_decoder calculate_military_pay calculate_military_retirement_pension calculate_pcs_move calculate_sgli_vs_private_insurance calculate_tsp calculate_va_disability calculate_act_score calculate_ap_exam_score calculate_college_acceptance calculate_college_major_roi calculate_college_roi calculate_dorm_vs_apartment calculate_fafsa_sai_estimator calculate_final_exam calculate_gpa calculate_gpa_planner calculate_graduate_school_roi calculate_gre_score_estimator calculate_high_school_course_planner calculate_lsat_score_estimator and 9 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): eb9c6015a8b2ffec. 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/xyz-everycalc-every-calc/badge.svg)](https://lazaretto.dev/mcp-registry/xyz-everycalc-every-calc)

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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