Unclear What the new marker changes in how or when held hook output reaches Claude is not stated.
What
A hook is a command you configure to run at certain points while Claude works. Claude Code can hold a hook's response before passing it on. It now marks a held response when that response has content meant for Claude. Clearing all held hooks now also resets a marker saying the session's environment is out of date.
Why
This affects how output from held hooks is delivered.
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What the new marker changes in how or when held hook output reaches Claude is not stated.