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factchk

100 / 100 · Low risk

Fine to try.

By LilMGenius/paperthin (GitHub) · coding · 1,440 stars · scanned at commit 6114322

Verify reality-grounded claims against external sources in both directions before they ship: could the 'absurd' be real, could the 'obvious' be false or long-established? Use whenever an artifact, or the sentence you are about to write, asserts something as plausible, realistic, absurd, novel, or impossible from intuition rather than a checked source; before relying on a factual claim in prose, a design rationale, a research claim, or a plan. Fires on metacognitive doubt: when you can't actuall…

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'factchk' ] || [ -L ~/.agents/skills/'factchk' ]; then echo 'A skill folder named factchk already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/LilMGenius/paperthin' "$d" && git -C "$d" checkout --quiet '61143228dae8549f4ebc3e9f3d8d65cb4bbe7764' -- 'skills/depth/factchk' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/depth/factchk' ~/.agents/skills/'factchk' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'factchk' ~/.claude/skills/'factchk' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history