Deterministic calculation
tools for AI agents.

Language models approximate. CalcFleet calculates. Every tool accepts a strictly typed input, validates it server-side with Zod, runs the same arithmetic the web UI uses, and returns a structured JSON result — with provenance for every published figure it relies on. No hallucinated numbers, no rounding guesses.

• ValidatedInputs pass Zod schemas before any math runs — bad inputs return a structured error with per-field issues, never NaN.
• TestedEvery calculator has a test suite verifying the math against hand-checked numbers — the same code serves the web UI and MCP.
• StructuredErrors come back as typed MCP content with isError: true and a JSON body — easy for agents to handle gracefully.

4 pilot tools accept an optional certify flag. Pass certify: true and the response includes — alongside the numeric result — a signed Verifiable Calculation Certificate (DSSE/Ed25519): a receipt of exactly what was calculated, how, and with which inputs, checkable by anyone at /verify or offline.

personal_loan_calculator · compound_interest_calculator · home_affordability_calculator · tiered_commission_calculator

{
  "method": "tools/call",
  "params": {
    "name": "personal_loan_calculator",
    "arguments": {
      "principal": 20000,
      "annualRatePct": 8.5,
      "termMonths": 60,
      "originationFeePct": 1,
      "certify": true
    }
  }
}