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.
Background agent resumption now has dedicated error handling and user notifications. When an agent fails to resume, a notification is shown with the error details rather than silently failing.
Evidence
Resume error handling (search for "resumeAgentBackground failed")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
