---
title: "urlhealth"
type: "entity"
entity_kind: "term"
status: "watching"
canonical_name: "urlhealth"
aliases: []
first_seen: "2026-10-21T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["reference hallucination","citation verification","fabricated snippets"]
seek_code_commit: "d40ee39"
---


Open-source URL liveness/hallucination classifier released by Rao, Wong &
Callison-Burch alongside their citation-reliability study (arXiv:2604.03173,
2026, "Detecting and Correcting Reference Hallucinations in Commercial
LLMs and Deep Research Agents") — a concrete mitigation tool for the URL-
hallucination problem their paper measures across ten commercial LLMs and
deep research agents.

First encountered 2026-10-21, mentioned in passing in the same capture that
surfaced the paper's "fabricated snippets" terminology; not yet
independently tested or described elsewhere in this vault. Watching for
recurrence.

## References
- [[claim-rao-wong-callison-burch-2026-fabricated-snippets-named-not-yet-systematically-studied]]
- Capture: 10-inbox/raw/2026-10-21-has-ai-safety-or-nlp-evaluation-literature-named.md