Write a feature specification by interviewing the owner — goal, scope, out of scope, acceptance criteria, end-to-end verification — saved to docs/spec/<feature>.md. Triggers - "spec", "write a spec", "requirements", "what should it do", "user stories".
Install
npx skills add laszewskimariusz/brain-ai --skill specnpx skills add laszewskimariusz/brain-ai --skill spec -a claude-code -gnpx skills add laszewskimariusz/brain-ai --skill spec -a codex -ggemini skills install https://github.com/laszewskimariusz/brain-ai.git --path plugins/brain-core/skills/specgh skill install laszewskimariusz/brain-ai specgit clone --depth 1 https://github.com/laszewskimariusz/brain-ai /tmp/laszewskimariusz__brain-ai
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/laszewskimariusz__brain-ai/plugins/brain-core/skills/spec ~/.claude/skills/spec # Claude Code
cp -R /tmp/laszewskimariusz__brain-ai/plugins/brain-core/skills/spec ~/.agents/skills/spec # Codex, Cursor, Gemini CLI, Copilot, OpenCode