Grades every evidence row in a Fetchproof project as P (primary - the page that owns the fact), S (secondary - context) or L (lead only - forums, video, blogs), and records contradictions between sources with both sides and which one is trusted and why, never averaging them.
Install
npx skills add StepenkoAnatoli/Fetchproof --skill source-gradernpx skills add StepenkoAnatoli/Fetchproof --skill source-grader -a claude-code -gnpx skills add StepenkoAnatoli/Fetchproof --skill source-grader -a codex -ggemini skills install https://github.com/StepenkoAnatoli/Fetchproof.git --path fetchproof/skills/source-gradergh skill install StepenkoAnatoli/Fetchproof source-gradergit clone --depth 1 https://github.com/StepenkoAnatoli/Fetchproof /tmp/StepenkoAnatoli__Fetchproof
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/StepenkoAnatoli__Fetchproof/fetchproof/skills/source-grader ~/.claude/skills/source-grader # Claude Code
cp -R /tmp/StepenkoAnatoli__Fetchproof/fetchproof/skills/source-grader ~/.agents/skills/source-grader # Codex, Cursor, Gemini CLI, Copilot, OpenCode