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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 v2.1.53

Background Task Notification Model Overhaul

Background agents and bash tasks no longer generate periodic progress polling messages. Instead, the system now relies entirely on completion notifications.

Details
  • The getProgressMessage function has been removed from all task types (local agents, background bash, remote agents, and teammates)
  • The task_progress attachment type is no longer generated or rendered
  • The Task tool description now explicitly states: "you will be automatically notified when it completes — do NOT sleep, poll, or proactively check on its progress"
  • lastReportedToolCount and lastReportedTokenCount tracking fields removed from task state
  • deltaSummarySinceLastFlushToAttachment and the delta summarization LLM call have been removed entirely
Evidence

Removed progress message infrastructure (search for "do NOT sleep, poll")

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 v2.1.53 →