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sbroenne / fact-checking

Review and validate claims using counter-hypothesis testing. Use when verifying technical content, checking references, validating API endpoints, or performing quality assurance on deliverables.

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Skill: Fact Checking

Context

Codifies the challenger agent review output format and methodology so any agent performing fact-checking or review produces consistent, structured output.

Pattern

Review Methodology

For every claim or deliverable under review:

  1. Ask: "What evidence supports this? What would disprove it?"
  2. Generate counter-hypotheses and test them against available data
  3. Verify URLs, package names, API endpoints, and external references actually exist
  4. Flag confidence levels: ✅ Verified, ⚠‹VARIATION SELECTOR U+FE0F› Unverified, ❌ Contradicted

Review Output Format

When reviewing another agent's work, use this template:

### Fact Check — {deliverable name}
**Claims verified:** {count}
**Issues found:** {count}

| # | Claim | Status | Evidence/Notes |
|---|-------|--------|---------------|
| 1 | {claim} | ✅/⚠‹VARIATION SELECTOR U+FE0F›/❌ | {supporting or contradicting evidence} |

**Counter-hypotheses tested:**
- {alternative explanation + result}

**Verdict:** {PASS / PASS WITH NOTES / NEEDS REVISION}

Confidence Levels

  • ✅ Verified — evidence confirms the claim
  • ⚠‹VARIATION SELECTOR U+FE0F› Unverified — cannot confirm or deny; suggest verification method
  • ❌ Contradicted — evidence disproves the claim

Ceremony Integration

Auto-trigger this skill before any architecture decision, or when an agent claim contains superlatives or percentage thresholds (e.g., "saves 75%", "always", "never"). The coordinator spawns the challenger agent with:

Challenger — fact-check {agent}'s claim: "{claim}"
Cite evidence for every verdict. Max 3 investigation cycles.