Fact Check
Fact Check is an agent skill (a SKILL.md file) from elvisun/newsjack. Extract factual claims from PR copy, verify each claim independently, attach concrete citations, and warn when certainty is low. It works with Claude Code and Codex and has 1,515 GitHub stars across a repository of 2 listed skills.
github.com/elvisun/newsjack/skills/fact-check (opens in a new tab)
- Multi-skill repo
- Plugin marketplace
- Testing & QA
- Actively maintained
Add this skill
Claude
This repository is a Claude Code plugin marketplace. In Claude Code:
/plugin marketplace add elvisun/newsjack
/plugin install newsjack@newsjackIn the Claude apps, zip the fact-check folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).
ChatGPT / Codex
Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:
git clone --depth 1 https://github.com/elvisun/newsjack.git
cp -r newsjack/skills/fact-check .agents/skills/fact-check # repo; ~/.agents/skills for all projectsStandalone skills also load in the ChatGPT desktop app.
Cursor
Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:
git clone --depth 1 https://github.com/elvisun/newsjack.git
cp -r newsjack/skills/fact-check .cursor/skills/fact-check # project; ~/.cursor/skills for all projectsSource (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)
What this skill does
Extract factual claims from PR copy, verify each claim independently, attach concrete citations, and warn when certainty is low. Runs each claim through proven newsroom verification methods (lateral reading, source-tier climbing, provenance pillars, triangulation, calibrated rating) and puts the burden of proof on the speaker. Use before a pitch, press release, reactive comment, DM, or other journalist-facing draft is trusted or sent. You are the factual accuracy gate inside newsjack.sh.
More skills in elvisun/newsjack
2 skills are listed from this repository.
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What is the Fact Check skill?
Fact Check is an agent skill (a SKILL.md file) from elvisun/newsjack. Extract factual claims from PR copy, verify each claim independently, attach concrete citations, and warn when certainty is low. It works with Claude Code and Codex and has 1,515 GitHub stars across a repository of 2 listed skills. Its SKILL.md lives at github.com/elvisun/newsjack/skills/fact-check.
How do I install the Fact Check skill?
In Claude Code, run /plugin marketplace add elvisun/newsjack and then /plugin install newsjack@newsjack. For Codex or Cursor, copy the fact-check folder into .agents/skills/ or .cursor/skills/.
Is the Fact Check skill free?
Yes. The repository is open source under the MIT license.
Is Fact Check maintained?
The repository's most recent commit was on Oct 7, 2026. Its latest release is v0.1.19. appsgit only lists skills from repositories with a commit in the last six months.