Citation Verifier — Existence-Verify a Bibliography Against Public Scholarly APIs

The headline existence-verification skill: given a bibliography in any common form, it proves entry-by-entry whether each reference actually exists by querying public scholarly APIs, then maps each result to the canonical AlterLab citation-hallucination taxonomy. It is the deterministic, network-grounded companion to the LLM-driven integrity_verification_agent — where that agent uses WebSearch + judgment, this skill uses authoritative API records and a reproducible Python script, so every verdict rests on retrieved records and the same input and source responses yield the same verdicts.

Verify references with the script, not from memory. A model checking citations against what it "remembers" shares the training data that produced the hallucination in the first place, so a fabricated reference that feels right passes undetected; only an external record settles existence.

Quick Start