Coverage-design method for qa-engineer — pyramid ratios per archetype, equivalence/boundary/property case selection, mutation score as the real coverage signal, and a flake-quarantine policy. Turns "coverage is 90%" (a number with no method) into a defensible test plan. Emits TEST-STRATEGY-{slug}.md, which the QA gate checks exists.
Install
npx skills add avelikiy/great_cto --skill test-strategynpx skills add avelikiy/great_cto --skill test-strategy -a claude-code -gnpx skills add avelikiy/great_cto --skill test-strategy -a codex -ggemini skills install https://github.com/avelikiy/great_cto.git --path skills/test-strategygh skill install avelikiy/great_cto test-strategygit clone --depth 1 https://github.com/avelikiy/great_cto /tmp/avelikiy__great_cto
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/avelikiy__great_cto/skills/test-strategy ~/.claude/skills/test-strategy # Claude Code
cp -R /tmp/avelikiy__great_cto/skills/test-strategy ~/.agents/skills/test-strategy # Codex, Cursor, Gemini CLI, Copilot, OpenCode