What
Plugins are add-ons that extend Claude Code. When a plugin sends a message, Claude Code used to pass along only its text, mode and origin. It now also passes decorations when the plugin supplies them.
Writing text into the input box (where you type before sending) now also passes one more piece of information than before.
Why
Plugins gain a new capability in how they fill the input box.
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What decorations look like on screen, and whether any normal release path uses them, are not known.