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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 v2.1.247

Summarizing uses the same prompt assembly as the rest of the conversation

You'll notice
Useful3 Signal3
Compaction

Summarizing now goes through the shared prompt builder, so it respects your session's agent definition.

What

The summarize flow no longer builds its own system prompt, tool list and context. It goes through the shared builder, which means it now respects the main agent definition for the session that it previously ignored.

Details
  • The unchanged error for picking a message that has scrolled out of scope is That message is no longer in the active context. Choose a more recent message.
Evidence

That message is no longer in the active context. Choose a more recent message.

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 →