# Contrast Solver Helper > Implement APCA/WCAG2 contrast requirements and solver behavior per src/planning/spec-v0.3.md and src/planning/roadmap-v0.3.md, with minimal tests. Use when this capability is needed. - Skill: `tomevault-io/contrast-solver-helper` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/contrast-solver-helper` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/contrast-solver-helper/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Product & Planning - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/contrast-solver-helper --- # Contrast Solver Helper Use this skill when implementing or validating contrast logic, APCA/WCAG2 targets, or solver behavior in `src/contrast`. ## Workflow 1. Read `src/planning/spec-v0.3.md` and the relevant phase in `src/planning/roadmap-v0.3.md`. 2. Implement contrast evaluation for APCA and WCAG2. 3. Implement solver behavior for targets and failure modes (best-effort vs strict). 4. Add minimal tests for target attainment and failure handling. ## Guardrails - Respect `ContrastRequirement` and `OutputOptions.strict` behavior. - Prefer deterministic solver paths; document edge-case behavior. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/claushaas) — claim your Tome and manage your conversions.