A
licenseA
qualityC
maintenanceProvides mortgage calculation tools, including monthly payment, amortization schedules, lump sum payments, and extra monthly payments for real estate agents and AI assistants.
7
MIT
Amortiza Loan Planner
Server Details
Mortgage & loan schedules
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- Healthy
- Last Tested
- Transport
- Streamable HTTP · MCP 2025-11-25
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Available Tools
2 toolscalculate_loanCalculate loan or mortgageRead-onlyIdempotentInspect
Use this when the user wants a mortgage calculator, loan calculator, or amortization calculator result: the monthly (or biweekly/weekly) payment, an amortization schedule or table, total interest, payoff date, a mortgage calculator with extra payments or for paying off early, or a full PITI payment with property tax, insurance, HOA and PMI. Takes the loan amount or home price with down payment, rate, and term. Returns exact payment, totals, interest and time saved by extra payments, a yearly summary, and a CSV of the full schedule. Fixed-rate loans only; does not model adjustable rates, interest-only or balloon loans, and does not look up current rates. Do not use for rent-vs-buy advice or choosing a lender.
ParametersJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| currency | No | ISO 4217 currency code for formatting, e.g. USD, EUR, GBP. Default USD. | |
| pmi_rate | No | Yearly private mortgage insurance rate as a percent of the original loan, e.g. 0.5. Needs home_price. Charged only while the loan is above 80% of the home value, and dropped once the balance reaches 78%. | |
| principal | No | Loan amount to borrow, e.g. 350000. Give this OR home_price with a down payment. | |
| home_price | No | Purchase price or current home value, e.g. 400000. Used with down_payment/down_payment_percent to get the loan amount, and as the value for PMI loan-to-value. | |
| start_date | No | Date of the first payment, YYYY-MM or YYYY-MM-DD, e.g. 2026-11. Defaults to the first day of next month. | |
| term_years | No | Loan term in years, e.g. 30. Give term_years or term_months. | |
| accelerated | No | For biweekly/weekly only: true pays half (biweekly) or a quarter (weekly) of the monthly payment each period, which adds about one extra monthly payment a year. Default false (a true biweekly/weekly amortization). | |
| annual_rate | No | Annual interest rate in percent (nominal APR used for the payment), e.g. 6.5 for 6.5%. 0 is allowed. | |
| hoa_monthly | No | Monthly HOA dues, e.g. 75. | |
| term_months | No | Loan term in months, e.g. 360 or 72 for a car loan. | |
| down_payment | No | Down payment amount, e.g. 50000. Used with home_price. | |
| extra_payment | No | Extra principal paid with every payment, e.g. 200 for $200 more each month. | |
| one_time_payments | No | Lump-sum extra payments, e.g. [{"date":"2030-01","amount":10000}]. | |
| payment_frequency | No | How often payments are made: monthly (default), biweekly (every 2 weeks, 26 a year), or weekly (52 a year). | |
| property_tax_annual | No | Yearly property tax for the PITI breakdown, e.g. 4800. | |
| down_payment_percent | No | Down payment as a percent of home_price, e.g. 20 for 20%. | |
| home_insurance_annual | No | Yearly homeowners insurance for the PITI breakdown, e.g. 1500. |
Output Schema
ParametersJSON Schema
| Name | Required | Description |
|---|---|---|
| pmi | Yes | |
| piti | Yes | |
| chart | Yes | |
| inputs | Yes | |
| yearly | Yes | |
| payment | Yes | |
| summary | Yes | |
| currency | Yes | |
| warnings | Yes | |
| downloads | Yes | |
| total_pmi | Yes | |
| home_price | Yes | |
| total_paid | Yes | |
| vs_monthly | Yes | |
| accelerated | Yes | |
| annual_rate | Yes | |
| loan_amount | Yes | |
| payoff_date | Yes | |
| term_months | Yes | |
| final_payment | Yes | |
| extra_payments | Yes | |
| payments_count | Yes | |
| total_interest | Yes | |
| total_principal | Yes | |
| payment_frequency | Yes | |
| first_payment_date | Yes |
compare_loansCompare loansRead-onlyIdempotentInspect
Use this when the user wants to compare 2 to 4 loan or mortgage options side by side, such as 15-year vs 30-year, different interest rates, paying discount points, or a mortgage calculator for refinance options. Shared values (loan amount, rate, term) go at the top level and each scenario overrides what differs. Returns payment, total interest, upfront costs, total cost, payoff date and the break-even month for points or fees, plus a comparison CSV. Fixed-rate loans only; does not look up current rates or recommend a lender. Do not use for a single loan (use calculate_loan).
ParametersJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| currency | No | ISO 4217 currency code for formatting, e.g. USD, EUR, GBP. Default USD. | |
| pmi_rate | No | Yearly private mortgage insurance rate as a percent of the original loan, e.g. 0.5. Needs home_price. Charged only while the loan is above 80% of the home value, and dropped once the balance reaches 78%. | |
| principal | No | Shared loan amount used by every scenario that does not set its own, e.g. 280000. | |
| scenarios | Yes | 2 to 4 loan scenarios. Each needs its own annual_rate and term unless set at the top level, e.g. [{"label":"30-year","annual_rate":6.5,"term_years":30},{"label":"15-year","annual_rate":5.75,"term_years":15}]. | |
| home_price | No | Purchase price or current home value, e.g. 400000. Used with down_payment/down_payment_percent to get the loan amount, and as the value for PMI loan-to-value. | |
| start_date | No | Date of the first payment, YYYY-MM or YYYY-MM-DD, e.g. 2026-11. Defaults to the first day of next month. | |
| term_years | No | Shared term in years for scenarios that do not set their own, e.g. 30. | |
| accelerated | No | For biweekly/weekly only: true pays half (biweekly) or a quarter (weekly) of the monthly payment each period, which adds about one extra monthly payment a year. Default false (a true biweekly/weekly amortization). | |
| annual_rate | No | Shared annual rate in percent for scenarios that do not set their own, e.g. 6.5. | |
| term_months | No | Loan term in months, e.g. 360 or 72 for a car loan. | |
| down_payment | No | Down payment amount, e.g. 50000. Used with home_price. | |
| payment_frequency | No | How often payments are made: monthly (default), biweekly (every 2 weeks, 26 a year), or weekly (52 a year). | |
| down_payment_percent | No | Down payment as a percent of home_price, e.g. 20 for 20%. |
Output Schema
ParametersJSON Schema
| Name | Required | Description |
|---|---|---|
| currency | Yes | |
| warnings | Yes | |
| downloads | Yes | |
| reference | Yes | |
| scenarios | Yes | |
| lowest_payment | Yes | |
| lowest_cost_of_borrowing | Yes |
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
2 tool updates
- First observed
calculate_loan - First observed
compare_loans
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