fact-checker

Trace claims to primary sources and issue verdicts with citations.

3|2|Updated Feb 27, 2026
One-click install
npx skills add https://github.com/grasberg/sofia --skill fact-checker-grasberg
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: fact-checker
Source: https://github.com/grasberg/sofia/tree/main/workspace/skills/fact-checker
Command: npx skills add https://github.com/grasberg/sofia --skill fact-checker-grasberg

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Claims and statements encountered daily often require verification against primary sources and credible references; this skill accelerates truth-seeking by structuring evidence-based conclusions.

Core Features & Use Cases

  • Evidence-based verification: Trace claims to primary sources, assess credibility, and present a clear verdict.
  • Source citation & transparency: Provide direct quotes, dates, and URLs to support findings.
  • Use Case: When a user questions the truth of a claim in news or social media, trigger a structured fact-check with cited sources and a verdict.

Quick Start

Ask the AI to verify a claim and fetch primary sources for citation

Frequently Asked Questions about fact-checker

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
What is the best way to cite sources for a fact-check verdict?▼

The best way to cite sources for a fact-check verdict is to provide direct quotes, dates, and URLs from primary sources and factual databases. This ensures transparency and supports the evidence-based conclusions of the verification process.

How do I verify claims against credible sources?▼

To verify claims, trace statements to primary sources, authoritative references, and factual databases. This process assesses source credibility, applies evidence-based evaluation, and outputs a structured verdict with direct citations, dates, and URLs for transparency.

What is evidence-based verification for misinformation?▼

Evidence-based verification is the process of tracing claims encountered in news or social media back to primary sources and factual databases. It assesses the credibility of these references to present a clear, structured verdict with direct quotes and citations.

How do I fact-check claims from news and social media summaries?▼

Fact-checking claims from news or social media involves identifying the statement and tracing it to primary sources and authoritative references. The process evaluates the evidence and produces a structured verdict supported by direct citations and factual databases.

Can I use this to evaluate research summaries that require evidence?▼

Yes, you can evaluate research summaries by tracing their claims to primary sources and authoritative references. The mechanism assesses credibility and outputs a structured verdict with cited sources, making it suitable for research summaries requiring evidence evaluation.

What is the best way to cite sources for a fact-check verdict?▼

The best way to cite sources for a fact-check verdict is to provide direct quotes, dates, and URLs from primary sources and factual databases. This ensures transparency and supports the evidence-based conclusions of the verification process.