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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 v2.1.228

Subagents doing delegated observation no longer trigger compact hooks

You'll notice
Useful3 Signal3
Hooks

Observation subagents no longer fire your PostCompact hooks when they compact.

PostCompactPreCompact
What

When a subagent set up for delegated observation compacts its context, your PostCompact hooks are skipped and PreCompact hook output is limited to whether compaction was blocked. Compaction in the main session and in ordinary subagents runs hooks as before.

Details
  • PostCompact returns immediately for these agents.
  • PreCompact still runs, but any custom instructions or user-facing message the hook returns are discarded.
Evidence

hook_event_name: "PostCompact"

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.228 →