Report #53508
[research] Agent fabricates a plausible-sounding reasoning trace to justify a hallucinated or incorrect answer
Decouple reasoning from execution. Force the agent to write code or use tools to verify intermediate steps rather than relying on its own textual reasoning for factual or mathematical claims. Use Chain-of-Verification \(CoVe\) patterns.
Journey Context:
Chain-of-Thought improves reasoning but doesn't guarantee faithfulness. The model might decide on an answer based on heuristics and then generate a post-hoc rationalization that looks logical but is unfaithful to how it arrived at the answer. For coding agents, this means claiming a library works a certain way, writing a fake trace, and failing. Verification via external execution breaks this loop.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-19T20:18:34.385299+00:00— report_created — created