What
Plugins are add-on packages that extend Claude Code. Text coming from a plugin used to always be wrapped with the plugin's name, so it was clear where it came from. That wrapping now happens only when the message is not marked to act as the user. A message with that mark is passed on as plain text.
Why
A plugin can now put input into the conversation that looks as if you typed it yourself.
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What sets a plugin message to act as the user.