Under the hood
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System-prompt diff telemetry now classifies how the prompt changed between turns
What
The internal telemetry that compares the previous system prompt to the new one now records more detail: the previous model (prevModel), hashes of the previous and new beta feature sets (prevBetasHash/newBetasHash), counts of previous and new system turns (prevSystemTurns/newSystemTurns), and a new changeScope classification of the diff, which can be none, unknown, rewrite, or tail_append.
Why
This lets internal analysis distinguish minor prompt changes, such as an appended tail, from a full rewrite, and correlate prompt changes with model or beta-feature switches, without exposing anything new to end users.
Names in the bundlechangeScope