claude-fact-checker-skill

🥈Silver

A fact-checking skill for Claude that extracts verifiable claims from text or URLs, cross-references them against academic, government, and journalistic sources, and delivers structured credibility reports.

1700Updated 1mo ago

Intermediate30min to implementautomation

Saves ~30 min per use

Quick InstallView Source

git clone https://github.com/fdaudens/claude-fact-checker-skill.git

Works with:

Claude

Overview

About This Skill

The claude-fact-checker-skill equips Claude with a structured verification workflow that identifies factual claims in any submitted text or article, then researches them against a curated list of trusted sources including Google Scholar, PubMed, CDC, WHO, PolitiFact, Reuters, and major newspapers. Each claim receives a status rating—TRUE, FALSE, PARTIALLY TRUE, UNVERIFIED, or OPINION—alongside a confidence level and a weighted credibility score calculated from source type, methodology, recency, and corroboration. Verification reports include an executive summary, per-claim findings with supporting and contradictory evidence, a scored source bibliography, and recommendations for further investigation. This skill is valuable for journalists, researchers, students, and anyone who needs to assess the factual accuracy of articles, statistics, or public statements quickly and systematically.

How to Use

Download the fact-checker.zip file from the repository. In Claude, navigate to Settings → Skills → Add skill and upload the downloaded file. Once installed, use prompts such as 'Fact-check this article: [paste text or URL]' or 'Verify these statistics' to trigger a full verification report.

Use Cases

Fact-checking a news article by pasting its text or URL

Verifying medical or scientific claims against peer-reviewed sources

Checking the accuracy of statistics cited in reports or presentations

Assessing the credibility of political statements or public claims

Setup & Installation

Quick Install

No install command available. Check the GitHub repository for manual installation instructions.

Alternative Install (Git Clone)

git clone https://github.com/fdaudens/claude-fact-checker-skill

Requirements

Claude Code or compatible AI agent
Works with: Claude

Quick Start Guide

Install the Skill

Copy the install command above and run it in your terminal.

Open Your AI Agent

Launch Claude Code, Cursor, or your preferred AI coding agent.

Try It Out

Use the prompt template or examples below to test the skill.

Customize

Adapt the skill to your specific use case and workflow.

Usage Examples

Prompt Template

Act as a fact-checker. Verify the following statement: '[STATEMENT]'. Provide sources, credibility ratings, and any conflicting information. Focus on [TOPIC] and prioritize recent data from [COUNTRY/REGION] if applicable.

Example Output

# Fact-Checking Results

## Statement Verified: "The global average temperature has increased by 1.2°C since pre-industrial times."

### Verification Results
- **Credibility**: High (Supported by IPCC reports and NASA data)
- **Sources**:
  - IPCC Sixth Assessment Report (2021)
  - NASA's Global Climate Change website (2023)
  - NOAA National Centers for Environmental Information (2023)
- **Conflicting Information**: Some climate skeptics argue the increase is closer to 0.8°C, citing satellite data interpretations.

## Additional Context
- The 1.2°C figure aligns with the Paris Agreement's threshold for significant climate impacts.
- Recent studies suggest the rate of increase has accelerated in the past decade.