AlexandrAI AGENTS.md
agents-md

AlexandrAI Tools Waist To Hip Ratio Agent Guide

Agent guide for waist-to-hip ratio rounding, sex-specific risk bands, and inch conversion.

AGENTS.md

Guidance for coding agents working on AlexandrAI Tools Waist To Hip Ratio in the alexandrai-tools project.

Project overview

This guide covers src/tools/waist-to-hip-ratio. calcWhr divides waist by hip, rounds to two decimals, and returns zero when hip is not positive. whrRisk applies sex-specific WHO-style threshold bands, and inToCm converts inches to centimetres.

Primary source files

  • src/tools/waist-to-hip-ratio/index.ts defines meta, Sex, WhrRisk, calcWhr, whrRisk, and inToCm.
  • src/tools/waist-to-hip-ratio/index.test.ts covers ratio math, rounding, zero hip, female thresholds, male thresholds, and inch conversion.
  • src/tools/waist-to-hip-ratio/Body.astro owns measurement inputs, unit handling, sex selection, and risk display.
  • src/tools/waist-to-hip-ratio/i18n.ts owns localized labels.
  • src/lib/tools.ts registers the tool metadata.

Setup commands

npm install npm test npm run typecheck npm run build npm run dev

Change rules

  • Return zero when hip measurement is zero or negative.
  • Round WHR to two decimals.
  • Use female thresholds: below 0.80 Low, 0.80 through 0.85 Moderate, above 0.85 High.
  • Use male thresholds: below 0.90 Low, 0.90 through 0.95 Moderate, above 0.95 High.
  • Keep inch to centimetre conversion as inches times 2.54.
  • Keep measurement units outside the pure ratio helper.
  • Do not present risk labels as a medical diagnosis.

Testing

Test ratio rounding, zero hip, negative UI inputs, all female threshold edges, all male threshold edges, inch conversion, unit switching, and health disclaimer copy.

PR checklist

  • npm test passes for waist-to-hip-ratio.
  • Calculator formulas, units, and rounding rules are documented.
  • Health and fitness outputs keep informational safety scope.
  • UI labels, validation, and pure helper tests stay aligned.