Three-layer verification pipeline for AI output. Extracts verifiable claims, finds supporting or contradicting sources via web search, runs adversarial review for hallucination patterns, and produces a structured verification report with source links for human review.
Install
npx skills add github/awesome-copilot --skill doublechecknpx skills add github/awesome-copilot --skill doublecheck -a claude-code -gnpx skills add github/awesome-copilot --skill doublecheck -a codex -ggemini skills install https://github.com/github/awesome-copilot.git --path skills/doublecheckgh skill install github/awesome-copilot doublecheckgit clone --depth 1 https://github.com/github/awesome-copilot /tmp/github__awesome-copilot
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/github__awesome-copilot/skills/doublecheck ~/.claude/skills/doublecheck # Claude Code
cp -R /tmp/github__awesome-copilot/skills/doublecheck ~/.agents/skills/doublecheck # Codex, Cursor, Gemini CLI, Copilot, OpenCode