Shikamaru MCP server

Shikamaru is a small helper that does date and money math for you, the kind used in finance. It counts days between dates using market rules, checks business days and holidays, and works out simple accrued interest. It is handy if you deal with loans, bonds, settlement dates, or payment schedules and you want the exact number, not a guess.

What this MCP server does

You ask your AI a question about dates or interest. The AI passes the details to Shikamaru through this helper. Shikamaru applies the market rule you named, like 30/360 or ACT/365F, and checks the right holiday calendar. It sends back the exact number or date, and your AI shows it to you in the chat.

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What you can do with it

• Count the day-count fraction between two dates under seven market rules
• Work out simple accrued interest from a notional, a rate, and a period
• Check if a date is a business day on a given calendar
• Move a date forward or back to the next business day using ISDA rules
• Add business days for T+N settlement
• Build a payment schedule with monthly to annual periods and stubs

Try asking your AI

• “What is the day-count fraction from 2003-11-01 to 2004-05-01 using ACT/ACT ISDA?”
• “Is 2024-06-19 a business day on the NYSE calendar?”
• “Move 2024-03-29 forward using modified-following on the TARGET calendar.”
• “Build a semiannual payment schedule from 2024-01-15 to 2026-01-15 on the TARGET calendar.”

What it gives back to you

You get back a plain answer in the chat, like a number, a date, or a short list of dates. For a schedule, you get each period with its unadjusted and adjusted dates. The helper also sends the same result as structured data, so the AI can use the numbers directly without reading them out of text.

Before you start

Who it's for

People who work with loans, bonds, settlement dates, or payment schedules and need exact date and interest math, like analysts, ops staff, and finance teams.