Under the hood
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Claude Code warns at startup if a hooks module registers a ui.render matcher with advice available
What
A new check runs when a hooks module (a script that registers hook handlers) subscribes to the ui.render event with a matcher (a filter deciding which calls the hook applies to). If there's advice available about that matcher, Claude Code now logs a warning at startup showing the matcher's contents.
Why
This surfaces potential problems with a hook's ui.render matcher up front, rather than leaving the author to discover an issue only when the hook misbehaves.
Names in the bundleui.render