Under the hood
A new step can extract prompt attachments and insert them as extra messages right after the first message
What
When a new flag, extractPromptAttachments, is set on parsed input, Claude Code now runs an additional processing step that builds extra messages from the input and inserts them into the message list immediately after the first message.
Why
This adds a way for attachments carried in a prompt to be pulled out and turned into their own messages, when this flag is enabled.
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What triggers `extractPromptAttachments` to be set, and what kind of attachments this applies to, isn't stated.