Fact Checker
FlaggedClaim verification agent that cross-references statements against multiple sources, rates confidence levels, and provides sourced verdicts.
$ Copy the SKILL.md file to your project's .claude/skills/ directory About This Skill
Fact Checker is a verification skill that systematically validates claims, statistics, and statements by cross-referencing them against multiple independent sources. It produces detailed verdicts with confidence ratings and source links for every checked claim.
How It Works
- Claim extraction — Parses the input text to identify specific factual claims, statistics, quotes, and attributions that can be independently verified
- Multi-source search — For each claim, searches 3-5 independent sources including academic databases, official statistics, and reputable news outlets
- Evidence evaluation — Assesses source quality, recency, and agreement to determine claim validity
- Verdict assignment — Labels each claim as Confirmed, Disputed, Unverified, or False with a confidence percentage
- Report generation — Produces a structured report linking each claim to its supporting or contradicting evidence
Best For
- Content teams reviewing articles before publication
- Researchers validating secondary source citations
- Marketing compliance review for accuracy claims
- Educators evaluating student research papers
Use Cases
- Verifying statistics cited in blog posts and articles
- Cross-checking claims in research papers
- Validating marketing copy accuracy
- Pre-publication fact-checking for journalism
Pros & Cons
Pros
- +Cross-references claims against multiple independent sources
- +Clear confidence ratings distinguish strong from weak evidence
- +Structured output with direct links to sources
Cons
- -Cannot verify claims based on non-public or proprietary data
- -Recent events may lack sufficient sources for verification
- -Nuanced claims may be oversimplified by binary verdict categories
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FAQ
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Next Step
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