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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.223

Attachment upload failures reported back to the model per file

You'll notice
Useful3 Signal0
Attachments

Attachments that fail to upload are now reported per file instead of silently vanishing.

What

When a bridge attachment fails to upload, the tool result now says so per file instead of silently omitting it.

Details
  • The attachment schema gained an optional upload_error string, populated on failure.
  • The tool result splits attachments into delivered and failed sets.
  • A result with any failure is marked as an error and lists each failed path with its error string, alongside a count of attachments that were included.
Evidence

upload_error: w.string().optional()

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.223 →