Unclear What sets turnCompanion to true, and which processing path excludes these messages, aren't shown in the finding.
What
Internal message-handling logic now checks a new turnCompanion flag on user messages:
- A rewritten helper now checks the
turnCompanionflag (in addition to the message's content structure) to decide whether a message should be excluded from certain processing. - The logic that decides whether a message belongs with the preceding tool-result group changed from checking tool_use_id membership against a completed set, to checking the new
turnCompanionflag plus content shape.
Why
This changes how Claude Code internally identifies which messages belong together as part of the same turn, which affects how messages are filtered and grouped without changing what a user directly interacts with.
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What sets `turnCompanion` to true, and which processing path excludes these messages, aren't shown in the finding.