TYEclipse/dsh-finance

README excerpt

dsh-finance Money math toolbox for DeepSeek Harness (dsh) — loan payments with amortization, compound growth projection, and nominal/effective rate conversion. Zero runtime dependencies, pure arithmetic, fully deterministic. Agents are bad at money math. "What's the monthly payment on a $300k mortgage at 4% for 30 years?" and "how much will $1,000 grow to in 10 years at 5% compounded monthly?" are exactly the questions LLMs miscalculate — compound interest and PMT formulas are easy to misremember, and a wrong answer here is a wrong financial decision. This plugin turns those questions into deterministic tool calls. Tools Tool Description loan payment Fixed-rate loan payment (PMT) → monthly payment, total paid, total interest. Optional amortization schedule (capped at 360 rows) and/or a constant extra principal payment per month (shortened term, interest saved). compound growth Future value of a lump sum with optional monthly contributions (ordinary annuity). Supports daily / monthly / quarterly / semiannually / annually / continuous compounding. Optional year-by-year breakdown (capped at 60 rows). rate convert Nominal (APR) ↔ effective (EAR) annual rate conversion, incl. continuous…

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