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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 v2.1.227

Delegated observer subagents are identified directly and skip attachments

Under the hood
Useful2 Signal3
Subagents

Observer subagents watching a delegated task no longer receive the usual attached files.

What

Subagents that exist only to observe a delegated task are now recognised from their own agent context rather than from a global list, and the code that gathers attachments returns early for them, so they no longer receive the usual attached files and context.

Evidence

delegatedObservation

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 v2.1.227 →