You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
BashArea: what it touches
Internal ChangesKind: in v2.1.311,
ImprovementsSection of the release
What
The Bash tool runs shell commands for Claude. It now measures how much time and processor work each command used:
Measuring: building a command now returns a cpuAccountJoin value, and the started process receives cpuTime, procCpuTime and cpuAccountWindow options. The shell command itself receives a startedAt and cpuTime option.
Result figures: when a command exits, its result gets a shellUsage record with wallMs (elapsed time), cpu (including whether a process was left running), procCpuMs and cpuAccount.
Only with a process id: the record is built only when the command has a process id.
Why
This adds resource accounting to each shell command's result. It looks like measurement for tracking. Nothing in the findings shows a change in what you see.
