Under the hood
Prompt submissions now get a unique ID tracked through processing
What
When a prompt is submitted, Claude Code now opens a short-lived tracked record for that submission, containing the agent ID, mode, value, and a unique ID (UUID). This same UUID is then passed along to the code that processes the submission.
Why
Giving each submission its own tracked ID makes it possible to correlate a specific submission with its processing, which is useful for tracing what happened to a given prompt.