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.
Warm spare background sessions no longer appear in your resumable session list.
What's wrong with this entry?
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What
Background sessions kept warm in a pool are now marked as spare and filtered out of both the session list and lookup by session id, so an unclaimed prewarmed session is never offered to you as something to resume or attach to.
Details
Session records carry a spare boolean; both listing paths exclude entries where it is set.
Evidence
(i) => i.sock && i.sock !== e && !i.spare,
Strings lifted out of the shipped bundle, so the claim above can be checked against them.