You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SDKArea: what it touches
ImprovementsKind: in v2.1.318,
ImprovementsSection of the release
What
A tool call is one action Claude takes, and each has an id. When a certain check is on, Claude Code now passes that id into the work the tool call starts. Status events from agents (separate Claude workers started to handle part of a task) now include enclosingToolUseId when it is known. Before, nothing was sent there.
Why
This looks like groundwork for linking tool calls made inside other tool calls back to the call that started them.
