What
Permission rules decide which shell commands Claude may run without asking. The code that matches these rules against command patterns takes an extra input. When asked, it now reports whether it judged the patterns; otherwise it requires a pattern matcher to be present. Previously it simply returned yes in that case.
Why
This may change which rules match in unusual cases, such as compound commands (several commands joined together, for example with &&).
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear which permission checks use the new matching or whether any rule now matches differently.