What
Besides the main conversation, Claude Code sends smaller side requests to the model. These side requests now include a traceparent header when one is available. traceparent is a standard header that labels a request so that tracing tools can follow it across several services.
Why
This lets tracing tools connect Claude Code's side requests to the rest of the work they belong to.
Names in the bundletraceparent
Documented inclaude-code/monitoring-usage