Incoming images can reuse a copy that was already being downloaded

When an image attachment comes in from a remote source, Claude Code can now reuse a copy of the image prepared for the model if that download was already started earlier (a prefetch). Before, the copy was only fetched at the moment the image was handled, and only after some extra platform checks. Those extra checks no longer apply to this path.

Claude Code records how each reuse turned out:

• The message was sent before the JPEG copy was ready
• The sign-in credential changed in the meantime
• The JPEG copy was no better than the original
• The prefetched copy was used
• Building the image failed

A second remote switch controls an extra option passed to the download step.