This post has been merged into No Error Doesn’t Mean Success: Silent Failures, Opus Fabricating Tool Output, and the Hook That Finally Stops It. All of the original content lives there now, and that’s the only copy that gets updated.
Claude Seeing Ghosts Four Nights Straight: A Log of Opus 4.8 Fabricating Tool Output
A four-day log of Opus 4.8 tool-result confabulation: from the technical symptoms to the GitHub issue to JSONL forensics.
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