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io.github.inity13/precisioncalc-mcp

by inity13 · remote · local (npm) · no sign-in to list tools · v2.1.1 · published by GitHub user inity13

High-precision finance & business calculations for AI agents — exact decimals, never floats.

Changes · 10
CompareRegistry entry

11 tools: 10 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http precisioncalc https://precisioncalc-mcp.pages.dev/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

11 tools

Changes things 10Claude Code: ask
  • batch_calculatePAID FEATURE.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    PAID FEATURE. Run many calculations in one request. calls: list of {tool, arguments} (max 100). One failure never aborts the batch.
  • business_daysBusiness-day arithmetic honoring weekends + regional holidays.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Business-day arithmetic honoring weekends + regional holidays. operation: add_business_days (needs days, negative ok) | count_business_days (needs end_date, inclusive) | next_business_day | previous_business_day. region: US | UK | EU | NONE. custom_holidays: list of YYYY-MM-DD.
  • calculate_metricCompute a business/SaaS/finance metric with exact decimal precision.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Compute a business/SaaS/finance metric with exact decimal precision. Metrics: ltv, cac, ltv_cac_ratio, payback_period_months, contribution_margin, gross_margin, churn_rate, mrr_growth_rate, arr, break_even_units, nrr, grr, rule_of_40, magic_number. Rates/margins are decimals (0.05=5%). Call list_metrics for schemas.
  • compound_growthCompound-interest/growth math.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Compound-interest/growth math. operation: future_value (rate, years, present_value) | present_value (rate, years, future_value) | cagr (begin_value, end_value, years). rate is annual decimal (0.08=8%). compounding: daily|weekly|monthly|quarterly|semiannually|annually|continuous.
  • currency_convertConvert an amount between major currencies (USD, EUR, GBP, JPY, CAD, AUD, CHF, CNY, INR) with Decimal precision.No findings

    Why it is in this group

    • The name "currency_convert" says "convert": a word for a change.
    Description, as the server wrote it
    Convert an amount between major currencies (USD, EUR, GBP, JPY, CAD, AUD, CHF, CNY, INR) with Decimal precision. Static offline table on the free tier; live/historical ECB rates (date/live=true) require a paid plan.
  • depreciationAsset depreciation schedule.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Asset depreciation schedule. method: straight_line | declining_balance | sum_of_years_digits. Book value converges to salvage_value.
  • health_checkServer health/status metadata.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Server health/status metadata.
  • internal_rate_of_returnInternal Rate of Return: per-period rate where NPV=0 (Newton + bisection).No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Internal Rate of Return: per-period rate where NPV=0 (Newton + bisection). Requires a sign change in cashflows.
  • loan_amortizationLevel-payment loan: monthly payment, total interest, payoff, and (optional) full schedule.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Level-payment loan: monthly payment, total interest, payoff, and (optional) full schedule. payment = P*r/(1-(1+r)^-n), r=annual_rate/12.
  • net_present_valueNet Present Value (discounted cash flow).No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Net Present Value (discounted cash flow). NPV = sum(CF_t/(1+rate)^t). cashflows[0] = period 0 (usually the negative outlay).
Only reads 1Claude Code: allow
  • list_metricsList every supported metric with descriptions and required/optional params.No findings

    Why it is in this group

    • The name "list_metrics" says "list": a word for reading.
    Description, as the server wrote it
    List every supported metric with descriptions and required/optional params.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 2.1.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http precisioncalc https://precisioncalc-mcp.pages.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__precisioncalc__list_metrics"
    ],
    "ask": [
      "mcp__precisioncalc__calculate_metric",
      "mcp__precisioncalc__currency_convert",
      "mcp__precisioncalc__business_days",
      "mcp__precisioncalc__compound_growth",
      "mcp__precisioncalc__net_present_value",
      "mcp__precisioncalc__internal_rate_of_return",
      "mcp__precisioncalc__loan_amortization",
      "mcp__precisioncalc__depreciation",
      "mcp__precisioncalc__batch_calculate",
      "mcp__precisioncalc__health_check"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as precisioncalc. Review it before you use it.