Fact Checker

Verify factual claims by analyzing evidence and source credibility.

42|1|Updated Mar 17, 2026
One-click install
npx skills add https://github.com/rar-file/surf --skill fact-checker-rar-file
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: Fact Checker
Source: https://github.com/rar-file/surf/tree/main/skills/fact_checker
Command: npx skills add https://github.com/rar-file/surf --skill fact-checker-rar-file

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Verify claims for accuracy and assess source credibility to combat misinformation.

Core Features & Use Cases

  • Identify the specific claim and gather supporting or contradicting evidence.
  • Check source credibility and bias; rate the claim as TRUE / MOSTLY TRUE / MIXED / MOSTLY FALSE / FALSE / UNVERIFIABLE.
  • Output transparent reasoning with sources and context to help decision making.

Quick Start

Provide a claim to verify and ask the assistant to check its factual accuracy.

Frequently Asked Questions about Fact Checker

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

FAQPage Schema
How do I fact-check a claim and assess source credibility?

To fact-check a claim, you must identify the specific assertion, gather supporting or contradicting evidence, and evaluate source credibility and bias to rate the claim's accuracy using a standardized verdict label.

What is the standardized verdict used for fact-checking claims?

The standardized verdict for fact-checking claims rates them as TRUE, MOSTLY TRUE, MIXED, MOSTLY FALSE, FALSE, or UNVERIFIABLE, ensuring transparent reasoning with sources and context for reliable evaluation.

How do I verify factual accuracy for journalism and research tasks?

You verify factual accuracy for journalism and research by enforcing explicit evidence gathering and source bias checks, producing structured outputs that provide transparent reasoning and context for decision making.

Can I use this approach to combat misinformation without external dependencies?

Yes, you can combat misinformation by verifying claims for accuracy and assessing source credibility without external dependencies, relying entirely on transparent reasoning and standardized verdict labeling.

What is the best way to evaluate source bias when verifying evidence?

The best way to evaluate source bias when verifying evidence is to check source credibility directly and rate the claim against a standardized scale, outputting transparent reasoning with sources and context.

When should I expect a claim to be rated as UNVERIFIABLE?

A claim is rated as UNVERIFIABLE when fact-checking yields insufficient supporting or contradicting evidence, preventing a definitive TRUE or FALSE verdict and requiring transparent reasoning to explain the context.