# Finance Toolkit MCP for AI Agents AI Agent Connect > Finance Toolkit MCP lets your AI agents perform precise financial calculations. It handles ROI, compound interest, and loan amortization tables using a deterministic engine to eliminate math hallucinations. It runs locally to keep your sensitive data private, making it perfect for professional-grade planning without the risk of errors. ## Overview - **Category:** productivity - **Price:** Free - **Endpoint:** https://edge.vinkius.com/vk_preview_a8BK9rquvt03nS511Zq6D2QDwhccx83foWWpjwe7/ai-agent-connect - **Tags:** financial-math, roi-calculation, amortization, loan-projections, deterministic-math, v8-engine ## Description Financial math doesn't leave room for close enough. If an AI hallucinates even one decimal point on a loan amortization schedule or a compound interest rate, the whole plan falls apart. This Connector fixes that by offloading the heavy lifting to a V8 Javascript engine. Instead of asking your agent to guess the math, you're giving it a calculator that follows exact rules. You can have your agent build out full loan summaries, compare different repayment types, or figure out exactly how much profit a project will net. Because it runs locally, your private financial data never touches an external server. It's a reliable way to get professional-grade numbers without the risk of errors. You can find this and other high-utility tools in the Vinkius catalog to build out your agent's capabilities. ## Tools ### calculate_roi Determines the Return on Investment percentage for a project. This helps you see the actual profitability of a marketing spend or asset. ### calculate_simple_interest Calculates simple interest over a specific period. It is the go-to for straightforward debt or lending scenarios. ### calculate_compound_interest Calculates compound interest over time with custom frequencies. Use this to project growth on savings or investments. ### calculate_amortization Generates a summarized amortization schedule for SAC or PRICE loan types. Use it to see exactly how much goes to principal versus interest each month. ## Prompt Examples **Prompt:** ``` I'm looking at a $500k property loan at 0.8% monthly. What's the summary for a SAC table over 360 months? ``` **Response:** ``` ### Loan Summary (SAC Table) * **First Installment:** $5,388.89 * **Last Installment:** $1,400.00 * **Total Interest Paid:** $722,000.00 This summary provides a clear overview of your debt structure over the 360-month period. ``` **Prompt:** ``` If I put $10,000 into a high-yield account at 7% compounded annually, how much will I have in 5 years? ``` **Response:** ``` ### Investment Projection * **Initial Investment:** $10,000.00 * **Final Amount:** $14,025.52 * **Total Interest Earned:** $4,025.52 At a 7% annual compound rate, your investment will grow by over 40% in five years. ``` **Prompt:** ``` We spent $2,500 on ads and made $8,700 in sales. What was our ROI? ``` **Response:** ``` ### Marketing ROI Analysis * **Net Profit:** $6,200.00 * **ROI:** 248% This campaign was highly successful, yielding a 248% return on your $2,500 spend. ``` ## Capabilities ### Generate amortization schedules Create a summarized table showing principal and interest payments for SAC or PRICE loans. ### Calculate compound interest Determine growth on investments or savings using customizable frequencies. ### Compute ROI percentages Get the exact return on investment for marketing spend, assets, or projects. ### Calculate simple interest Find the basic interest accrued over a specific period for debt or lending. ### Compare loan repayment types Evaluate the difference between constant amortization and French loan tables. ## Use Cases ### Property Financing Comparison An investor wants to see the difference between SAC and PRICE loans for a $500k property. The agent uses calculate_amortization to provide a summary. ### Marketing ROI Analysis A manager wants to know if a $2,500 campaign was worth it. The agent uses calculate_roi to show the 248% return. ### Savings Projections A user wants to know what $10k invested at 7% looks like in 5 years. The agent uses calculate_compound_interest to give the final amount. ### Small Business Debt A bakery owner needs to know the simple interest on a small equipment loan. The agent uses calculate_simple_interest to find the total. ## Benefits - Eliminate math hallucinations by using a deterministic V8 engine for every calculation. - Compare SAC and PRICE loan tables instantly using calculate_amortization to see which debt structure saves more money. - Get exact compound interest figures with customizable frequencies through calculate_compound_interest. - Track investment profitability accurately with the calculate_roi tool for clear margin analysis. - Keep your financial data private since all calculations happen on your local machine. - Save context window space by receiving summarized tables instead of massive raw data lists. ## How It Works The bottom line is you get deterministic math results that you can actually trust for business decisions. 1. Connect the Finance Toolkit MCP to your preferred AI client. 2. Describe the specific loan terms, investment amounts, or interest rates you need to process. 3. Get back exact tables, summaries, or percentages without any math errors. ## Frequently Asked Questions **Can the Finance Toolkit MCP handle different loan types?** Yes, it supports both SAC and PRICE loan tables, allowing you to compare different repayment structures easily. **Is my financial data safe with the Finance Toolkit MCP?** Yes, the Connector runs locally on your machine, so your sensitive financial data never leaves your infrastructure. **Can the Finance Toolkit MCP do compound interest?** Yes, it can calculate compound interest over any period with customizable frequencies for accurate growth projections. **How accurate are the results from the Finance Toolkit MCP?** The results are 100% deterministic because the math is handled by a V8 Javascript engine rather than an LLM guess. **Can the Finance Toolkit MCP calculate marketing ROI?** Yes, it can calculate the Return on Investment percentage for any project, including marketing spend and asset sales. **Why doesn't the amortization tool return the full 360-month table?** Returning 360 lines of JSON would severely bloat the LLM's context window, increasing API costs and causing distraction. We return a "Smart Summary" (total paid, total interest, first and last installments) which is perfect for AI decision-making. **Are the compound interest calculations precise enough for banking?** Yes. The underlying engine relies on JavaScript's high-precision floating-point arithmetic (IEEE 754 standard). Outputs are rounded to 2 decimal places specifically for financial display standards. **Can it compare SAC vs PRICE automatically?** An AI agent using this Connector can execute the tool twice in parallel—once for SAC and once for PRICE—and instantly write a comparative analysis report for you based on the exact totals.