Agent skill · research science · daymade
fact-checker
Verifies factual claims in documents using web search and official sources, then proposes corrections with user confirmation. Use when the user asks to fact-check, verify information, validate claims, check accuracy, or update outdated information in documents. Supports AI model specs, technical documentation, statistics, and general factual statements.
Why this skill is useful
Provides a structured workflow and specific authoritative sources for verifying claims that the AI wouldn't reliably generate on its own.
What it needs
About 5k tokens when loaded. Last updated 2026-08-07. 1,320 stars on the source repository.
What this skill does
Fact Checker Verify factual claims in documents and propose corrections backed by authoritative sources. When to use Trigger when users request: "Fact-check this document" "Verify these AI model specifications" "Check if this information is still accurate" "Update outdated data in this file" "Validate the claims in this section" Workflow Copy this checklist to track progress: Step 1: Identify factual claims Scan the document for verifiable statements: Target claim types: Technical specifications (context windows, pricing, features) Version numbers and release dates Statistical data and metrics API capabilities and limitations Benchmark scores and performance data Skip subjective content: Opinions and recommendations Explanatory prose Tutorial instructions Architectural discussions Step 2: Search authoritative sources For each claim, search official sources: AI models: Official announcement pages (anthropic.com/news, openai.com/index, blog.google) API documentation (platform.claude.com/docs, platform.openai.com/docs) Developer guides and release notes Technical libraries: Official documentation sites GitHub repositories (releases, README) Package registries (npm, PyPI, crates.io) General claims: Academic papers and research Government statistics Industry standards bodies Search strategy: Use model names + specification (e.g., "Claude Opus 4.5 context window") Include current year for recent information Verify from multiple sources when possible Step 3: Compare claims against sources Create a comparison table: Claim in Document Source Information Status Authoritative Source ------------------- ------------------- -------- --------------------- Claude 3.5 Sonnet: 200K tokens Claude Sonnet 4.5: 200K tokens ❌ Outdated model name platform.claude.com/docs GPT-4o: 128K tokens GPT-5.2: 400K tokens ❌ Incorrect version & spec openai.com/index/gpt-5-2 Status codes: ✅ Accurate - claim matches sources ❌ Incorrect - claim contradicts sources ⚠️ Outdated - claim was true but supers …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills daymade/fact-checker