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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 v2.1.221

Background session records whether it booted via resume

Under the hood
Useful2 Signal0
Sessions

Background sessions now remember whether they resumed, so interactive behaviour is judged correctly.

What

Background PTY sessions track how they came up so interactive capability can be decided correctly.

Details
  • bootedViaResume is computed from the launch mode and restoresTranscript, and persisted across spawn, rehydrate and reattach.
  • It is used to decide whether the session is capable of interactive marks.
Evidence

bootedViaResume

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

See this entry in the whole of v2.1.221 →