fact-check

---

name: Fact Check description: This skill should be used when the user asks to "verify claims", "fact check", "validate documentation", "check sources", or needs verification of external source references. Provides patterns for systematic fact verification using Context7 and WebSearch. version: 0.2.0

<error_escalation inherits="core-patterns#error_escalation"> Claim cannot be verified due to missing documentation Conflicting information from different sources Claim directly contradicts authoritative source Security-related claim is incorrect </error_escalation>

Copy  Version-specific example:
  Claim: "React 18 introduces automatic batching for all updates"
  Verification: Query Context7 with topic="batching" for React 18 docs
  Result: Confirmed - React 18 automatically batches state updates inside promises, setTimeout, and native event handlers
</example>

Copy  Threshold: Flag claims with confidence below 80
</example>

Copy  Web standards: WebSearch with domain filters
  MDN Web Docs: developer.mozilla.org
  W3C: w3.org
  WHATWG: html.spec.whatwg.org
  OWASP: owasp.org
</example>

<best_practices> Use Context7 as primary source for library documentation claims Flag all claims with verification confidence below 80 Document evidence source for each verification Prefer libraries with Context7 trust score 7+ for verification Use WebSearch fallback when Context7 unavailable Include direct quotes from sources as evidence Note when verification source has version mismatch </best_practices>

<anti_patterns> Marking claims as verified without actual source check Always query Context7 or WebSearch for evidence before marking verified

<related_skills> Core tool for library documentation verification Evidence collection methodology Documentation accuracy standards </related_skills>