Tests whether a stated constraint is real — distinguishing genuine limits from assumptions, habits, or politics dressed as facts. Triggers: 'is this really a constraint', 'challenge the assumption', 'who says we can't', 'is this actually fixed', 'test the constraint'.
Install
npx skills add human-avatar/skills-for-humanity --skill s4h-constraint-hardness-testingnpx skills add human-avatar/skills-for-humanity --skill s4h-constraint-hardness-testing -a claude-code -gnpx skills add human-avatar/skills-for-humanity --skill s4h-constraint-hardness-testing -a codex -ggemini skills install https://github.com/human-avatar/skills-for-humanity.git --path skills/s4h-constraint-hardness-testinggh skill install human-avatar/skills-for-humanity s4h-constraint-hardness-testinggit clone --depth 1 https://github.com/human-avatar/skills-for-humanity /tmp/human-avatar__skills-for-humanity
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/human-avatar__skills-for-humanity/skills/s4h-constraint-hardness-testing ~/.claude/skills/s4h-constraint-hardness-testing # Claude Code
cp -R /tmp/human-avatar__skills-for-humanity/skills/s4h-constraint-hardness-testing ~/.agents/skills/s4h-constraint-hardness-testing # Codex, Cursor, Gemini CLI, Copilot, OpenCode