Build students' capacity to compare accounts across multiple historical sources — identifying agreements, contradictions, and gaps. Use when students treat individual documents as complete answers rather than partial perspectives.
Install
npx skills add GarethManning/education-agent-skills --skill corroboration-skill-buildernpx skills add GarethManning/education-agent-skills --skill corroboration-skill-builder -a claude-code -gnpx skills add GarethManning/education-agent-skills --skill corroboration-skill-builder -a codex -ggemini skills install https://github.com/GarethManning/education-agent-skills.git --path skills/historical-thinking/corroboration-skill-buildergh skill install GarethManning/education-agent-skills corroboration-skill-buildergit clone --depth 1 https://github.com/GarethManning/education-agent-skills /tmp/GarethManning__education-agent-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/GarethManning__education-agent-skills/skills/historical-thinking/corroboration-skill-builder ~/.claude/skills/corroboration-skill-builder # Claude Code
cp -R /tmp/GarethManning__education-agent-skills/skills/historical-thinking/corroboration-skill-builder ~/.agents/skills/corroboration-skill-builder # Codex, Cursor, Gemini CLI, Copilot, OpenCode