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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

Compaction builds its system prompt with the shared assembler

Under the hood
Useful1 Signal3
Compaction

Compaction now builds its system prompt with the same builder the main paths use.

What

Compaction and forking now assemble their system prompt through the same builder the main query paths use, which reuses an already-rendered prompt when there is one. It is passed no agent definition here, so nothing about the prompt changes yet.

Evidence

mainThreadAgentDefinition: void 0,

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 →