Identifies the entities with disproportionate structural importance — whose removal would collapse the system. Use when asked 'who is critical here', 'what holds this together', 'single points of failure', 'what if we lose X', 'irreplaceable actors', or 'structural dependencies'.
Install
npx skills add human-avatar/skills-for-humanity --skill s4h-ecology-keystone-speciesnpx skills add human-avatar/skills-for-humanity --skill s4h-ecology-keystone-species -a claude-code -gnpx skills add human-avatar/skills-for-humanity --skill s4h-ecology-keystone-species -a codex -ggemini skills install https://github.com/human-avatar/skills-for-humanity.git --path skills/s4h-ecology-keystone-speciesgh skill install human-avatar/skills-for-humanity s4h-ecology-keystone-speciesgit 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-ecology-keystone-species ~/.claude/skills/s4h-ecology-keystone-species # Claude Code
cp -R /tmp/human-avatar__skills-for-humanity/skills/s4h-ecology-keystone-species ~/.agents/skills/s4h-ecology-keystone-species # Codex, Cursor, Gemini CLI, Copilot, OpenCode