Identify unusual account or transaction activity, explain the specific signals that make it unusual, and assemble source-linked evidence for customer or fraud-team review. Use when a consumer, service agent, or fraud analyst asks "why is this transaction flagged", "does this activity look unusual", "screen this account for anomalies", or needs a review-ready evidence pack. This skill explains and evidences signals and proposes a review priority; it NEVER makes a fraud determination, confirms fraud, blocks/freezes an account, or files a report — those are human/authorized-system actions.
