What happened
Agentic coding can fabricate convincing but false repros.
Why it matters
For builders using coding agents, the key warning is that plausible-looking outputs can still be fabricated, including tests and visual repros. The post also reinforces that testing quality, fuzzing, and human review remain important when agents are used to generate fixes at scale.
Severity rationale
[S3] single documented fabricated repro
Source: danluu.com
See also: Hallucination Incident Index