Add 25+ Calculator Tools to Your AI Assistant with One MCP Package

Your AI can answer mortgage questions — but only with the right tools You ask Claude: "Should I refinance my mortgage?" Claude gives you a thoughtful answer. It explains rate spreads, break-even periods, closing costs. It sounds authoritative. But then you notice: the math doesn't add up. The monthly savings it quoted are off by $180. The break-even timeline is wrong by two years. This isn't Claude being lazy. It's a fundamental limitation of language models doing arithmetic. LLMs predict the next token — they don't execute deterministic algorithms. When you need 6.5% APR × $420,000 × 360 months, you need actual code to run. Not a prediction. This is the problem MCP (Model Context Protocol) solves. The problem: LLMs hallucinate numbers I've been working with AI assistants for financial and fitness calculations for a while, and the pattern is consistent: Qualitative analysis: excellent Precise arithmetic: unreliable Ask Claude to explain the difference between compound and simple intere