Blog Factcheck
Verify statistics and claims in blog posts by fetching cited source URLs and checking...
Install
npx skills add AgriciDaniel/claude-blog --skill blog-factcheck -g -a claude-code -y- Repository
- AgriciDaniel/claude-blog2.6k
- Category
- Writing
- Updated
- 6d ago
- License
- MIT
- Context cost
- Mediumabout 2,003 tokens
- Runs scripts
- No, instructions only
What it does
Verify statistics and claims in blog posts by fetching cited source URLs and checking if the claimed data actually appears on the page. Extracts all load-bearing claims (statistics, product or policy claims, ranking and comparative claims, named sources), validates cited URLs before fetching, and scores match confidence (exact match 1.0, paraphrase 0.7-0.9, not found 0.0). Flags uncited claims as UNVERIFIED. Use when user says "fact check", "verify statistics", "check sources", "validate claims", "factcheck", "source verification".
Blog Fact-Check
Verify statistics, claims, and source attributions in blog posts. Pure Claude pipeline with no external NLP dependencies.
Workflow
Step 1: Read the Blog Post
Read the target file and identify all sections containing data or other load-bearing claims.
Step 2: Extract Load-Bearing Claims
Scan the full text for every claim that would need evidence if challenged. Include numeric claims and non-numeric load-bearing claims such as policy, product, ranking, methodology, legal, comparative, "best", "first", "latest", or platform-behavior statements. Build a claims list with these fields:
| Field | Description |
|---|---|
| claim_text | The exact sentence or phrase containing the claim |
| claim_type | Statistic, policy, product, ranking, comparative, legal, methodology, freshness |
| value | The numeric value if present (e.g., "42%", "$1.2M", "3x") |
| attribution | Named source if present (e.g., "HubSpot", "Gartner 2025") |
| url | Cited URL if present (from markdown link or parenthetical) |
| location | Heading or line number where the claim appears |
Step 3: Verify Cited Claims
For each claim that includes a URL:
