Answers why code is shaped as it is with an evidence-rated report, tagging each claim [Direct], [Supported], [Inferred], or [Speculative] and closing with a Sources Consulted list that covers git, PRs, tickets, docs, chat, and observability, naming the sources left unchecked. Read-only.
Install
npx skills add bostonaholic/skills --skill investigating-design-rationalenpx skills add bostonaholic/skills --skill investigating-design-rationale -a claude-code -gnpx skills add bostonaholic/skills --skill investigating-design-rationale -a codex -ggemini skills install https://github.com/bostonaholic/skills.git --path skills/engineering/investigating-design-rationalegh skill install bostonaholic/skills investigating-design-rationalegit clone --depth 1 https://github.com/bostonaholic/skills /tmp/bostonaholic__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/bostonaholic__skills/skills/engineering/investigating-design-rationale ~/.claude/skills/investigating-design-rationale # Claude Code
cp -R /tmp/bostonaholic__skills/skills/engineering/investigating-design-rationale ~/.agents/skills/investigating-design-rationale # Codex, Cursor, Gemini CLI, Copilot, OpenCode