Source Intelligence

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.

All of v2.1.247 Home All releases olderv2.1.246 v2.1.248newer
Claude Code v2.1.247

Background task output survives write failures, and says so when it does not

You'll notice
Useful3 Signal2
Background Tasks

Background output writing now retries, logs once per error type, and tells you exactly what was dropped.

What

The writer that saves a background task's output now tracks whether it is failing, how many characters are still unwritten, and whether anything was lost. Repeated retry errors are logged once per class rather than every attempt, and past a threshold the queued output is dropped with an error naming exactly how many characters were discarded.

Details
  • Retry errors are grouped as disk exhaustion or unexpected, so a full disk does not flood the log.
  • A write that throws re-queues its marker instead of losing its place.
  • When output is truncated for hitting the on-disk cap, the notice now replaces the chunk it truncates instead of being appended next to it.
Evidence

Task output still cannot be written

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 v2.1.247 →