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 v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Finished background tasks would carry their output tail

Not switched on
Useful1 Signal3
Background Tasks

Completion notices would carry a finished task's output tail, on a disabled path.

Part of the background-task delivery path compiled off in this build.

What

On the delivery path that is compiled off in this build, a finished background task's output tail is read before the completion notice goes out, so the notice would arrive with the tail attached.

Details
  • If the read fails, the task is delivered without the tail and a warning "output tail unreadable, delivering without it" is logged.
  • Sits behind the same compiled-off guard as the GetTask surface, so nothing reaches users here.
Evidence

output tail unreadable, delivering without it

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 v2.1.248 →