Unclear It is not clear what the extra names are or what bypassCapabilityNotification does.
A PreToolUse hook is a command you set up to run just before a tool call executes. A tool call is one action Claude takes, such as editing a file or running a shell command, and the hook can block it. When Claude Code checks whether any PreToolUse hook applies to a tool call, it can now be given a second tool name. It adds extra names worked out from that one to the list it matches your hooks against. Before, it matched against a single tool name.
The permission information Claude Code passes around for a tool call can also carry a new optional field called bypassCapabilityNotification.
In practice, a PreToolUse hook may now run for a tool call that reaches it under a different name than the one the hook was written for.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
* Security: Fixed PreToolUse hook approvals and auto mode bypassing the permission prompt for file reads from network (UNC) pathschangelog see the edit
It is not clear what the extra names are or what `bypassCapabilityNotification` does.
Anthropic's documentation has since written up PreToolUse, on Claude Code changelog.