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reach-source-check

100 / 100 · Low risk

Fine to try.

By polar-bear-org/claude-skills (GitHub) · design · 54 stars · scanned at commit 95f0180

Checks the source behind each fact for who published it, whether it is the original, the date on the page and whether the page says what the fact claims, with disagreements shown side by side and a keep, fix or drop per fact. Use for "run reach-source-check", "source check", "check my sources", "is this source reliable", "verify this fact", "where did this fact come from", "fact check my research", "SIFT check", part of the Claude Guide for Outreach Pack by 90n.

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/'reach-source-check' ] || [ -L ~/.agents/skills/'reach-source-check' ]; then echo 'A skill folder named reach-source-check already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/polar-bear-org/claude-skills' "$d" && git -C "$d" checkout --quiet '95f01806ca43f6ee788d0579743e35853b695930' -- 'packs/outreach-pack/skills/reach-source-check' && mkdir -p ~/.agents/skills && cp -R "$d"/'packs/outreach-pack/skills/reach-source-check' ~/.agents/skills/'reach-source-check' && 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/'reach-source-check' ~/.claude/skills/'reach-source-check' (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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