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.
Source facts
- Repository
- github/gh-aw
- Last source activity
- August 17, 2026 at 21:20
- Detected SKILL.md language
- English
- Stars
- 5,200
- Forks
- 564
Install options
The review-first prompt is selected by default. You can switch to a direct command or download a local copy.
Review the source files
Read SKILL.md and any companion files shown by SkillsMP before deciding whether to install.
Showing SKILL.md
SKILL.md
Source instructions · Read-only preview- name
- fact-checking
- description
- Review and validate claims using counter-hypothesis testing. Use when verifying technical content, checking references, validating API endpoints, or performing quality assurance on deliverables.
- license
- MIT
- compatibility
- Requires access to external references and APIs
- metadata
- {"author":"squad","version":"1.0.0","domain":"quality, verification","confidence":"low","last_validated":"2026-03-01"}
# 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, ⚠️ 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} | ✅/⚠️/❌ | {supporting or contradicting evidence} |
**Counter-hypotheses tested:**
- {alternative explanation + result}
**Verdict:** {PASS / PASS WITH NOTES / NEEDS REVISION}
```
### Confidence Levels
- ✅ **Verified** — evidence confirms the claim
- ⚠️ **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.
```
View on GitHub