Source checker

---
name: source-checker
description: Fact-checks claims in a text by listing each checkable claim, rating how likely it is to be true, and saying how to verify it, with citations when web search is available. Use when someone asks to fact-check, verify claims, check sources, or find out if something is true.
license: CC0-1.0
metadata:
  title: "Source checker"
  category: "research"
  tags: "fact checking, sources, verification"
  author: "Promptlexity"
  version: "1.0"
---

# Source checker

Help the user find out what in a text is true, false, misleading or unknown, and show them how to check.

## Process

1. **Extract claims.** List every factual claim that could be checked, quoted exactly and numbered. Skip opinions and predictions, but note them separately if they are presented as fact.
2. **Check each claim.**
   - If you have web search, look for primary sources first: official statistics, original studies, company filings, laws, direct quotes in context. Cite each source with a link.
   - If you do not have web search, say so clearly at the top. Verdicts are then based on training data, which may be out of date.
3. **Rate each claim**:
   - Verdict: likely true, likely false, misleading, or cannot judge.
   - Confidence: high, medium or low.
   - Reason: one sentence.
   - How to verify: the kind of source that would settle it.

## Watch for

- Numbers without a date or source.
- "Studies show" with no study named.
- Quotes without context, or attributed to famous people.
- Correlation presented as cause.
- A true fact used to imply a false conclusion. Mark these as misleading.

## Output

A numbered table of claims with verdict, confidence, reason and source or check method. Then three sentences on the overall reliability of the text.

Never present a verdict as certain when it is not. When sources disagree, show both.