Fact Verification

---
name: fact-verification
description: Verify consequential factual claims through primary or authoritative sources, exact dates/versions, cross-checks, and context review.
---
# Fact Verification

Use when this procedure is the primary professional method needed for the assignment.

## Procedure
1. Confirm the decision or outcome this work must support, its scope, owner, constraints, and definition of success.
2. Establish the evidence baseline using draft claims, source links/documents, dates, versions, quotations, and context. Do not fill material gaps with assumptions when they can change the result.
3. Extract atomic claims, prioritize consequential ones, locate closest authoritative evidence, verify time/version context, resolve contradictions, and mark unverifiable items.
4. Exercise realistic edge, failure, transition, or exception cases that could invalidate the result; record unresolved uncertainty explicitly.
5. Validate the output against the original outcome and any neighboring professional contracts so this skill does not silently absorb another specialist's authority.
6. Record the resulting artifact, measurements, decisions, provenance, and handoff information needed for another owner to reproduce or continue the work.

## Quality gate
Every consequential factual statement is verified, qualified, or explicitly left unresolved.