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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

Legacy background-session paths are counted once each

Under the hood
Useful1 Signal2
Sessions

Each older background-session operation reports once, showing which legacy paths are still used.

What

The first time each older background-session operation is used, tengu_dead_probe_bg_legacy_op fires, making continued use of the pre-storage code path visible without repeating on every call.

Evidence

tengu_dead_probe_bg_legacy_op

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

See this entry in the whole of v2.1.227 →