What
Claude Code keeps an internal list, keyed by tool, of which result fields a tool is allowed to report (used for things like comparing or caching a tool's output). A new entry was added to this list for the Bash tool, allowing its results to carry stdout, stderr, interrupted, and timedOutAfterMs. Previously, the entries in this list only allowed a structuredPatch field, used by file-editing tools.
Why
This lets the system track a command's standard output, standard error, whether it was interrupted, and how long it ran before timing out, as recognized fields on Bash tool results.
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The writer flagged doubt
It's not stated which tool identifier this new entry corresponds to, though the fields match a shell command's output.