Suspected Message Dropping Bug in Claude Code
BFJ-Concerns · reddit · 2026-07-18
This Reddit thread discusses a potential issue where messages in **Anthropic's Claude Code** are silently dropped server-side. - The author argues that what appears as "Fable/Claude being quiet" is actually text disappearing before reaching the client. - Using local session files and scripts, they analyzed data across two machines: **6,166 out of 23,295 messages** dropped text (~**26%**). Scanning **73,000 messages** across **Opus 4.8, Opus 4.7, Sonnet 5, and Haiku 4.5** with the same method yielded zero hits. - The trigger is consistent: text is most likely deleted when the model thinks, outputs text, thinks again, and then calls a tool. Text immediately adjacent to tool calls or at the end of a turn is usually safe. - The thread explains this text is erroneously routed through a "protected/encrypted" channel; the model thinks it sent it, but the client never receives it, and it may be permanently lost after context compression. - The author notes the earliest and most active related issues have been open for a long time with no maintainer response, urging others to run the script to see if the drop rate universally sits around 25%.
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