Before you start
Full text, reference date and available sources. Enable web search for external checks; without access, limit the review to supplied documents. Pack in English.
Fact-checking with Claude: build a traceable report →
1. Download the native pack
Keep the complete ZIP without extracting it. If already installed and enabled, skip to step 3.
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Fact-Checker
2. Install and enable in Claude
In Customize > Skills, use + > Create skill > Upload a skill to import the ZIP, then enable it. Check code execution and file creation. Attaching Markdown to a chat does not install a skill.
3. Prepare the inputs
Attach the text and original source. Prioritize numbers, quotations and comparisons. Separate publication dates from event dates.
4. Request the result
Request a verdict for each claim, evidence, available URL and date, suggested correction and an unchecked list. Inaccessible evidence cannot support certainty.
A request to try
Use fact-checker. Fictional document-only check: source “12 participants responded; 8 found the session useful.” Draft “All participants found the session useful.” Compare, distinguish respondents from participants and suggest a correction without inventing external sources.
5. Check the result
- Open sources and locate cited passages.
- Recount claims by verdict.
- Separate false, unverifiable and unchecked.
Files and advanced installation
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Fact-Checker
With Claude Code already installed, run this command in your project terminal, restart Claude Code and invoke the skill with your data.
npx educasium --skill fact-checker --global