What
Claude Code now notes the time each turn ends. A turn is one round of you sending a message and Claude answering. When you come back to the session after a pause, Claude Code sends a usage report to Anthropic with:
- How many seconds the session sat idle
- How much context the conversation holds, counted in tokens (the small pieces of text a model reads)
- Whether a summary of the conversation is being held ready
- Whether idle compaction is on. Compaction means shrinking a long conversation into a summary so it fits.
If the report fails, Claude Code logs that it was dropped and carries on as normal.
Why
It shows that Anthropic is measuring how compacting a conversation during idle time works in practice. It does not change anything you see.