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.