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.
When the team leader is idle but teammates are still working, the spinner now shows a distinct "Idle · teammates running" state instead of the generic working indicator.
Evidence
Leader idle state in spinner (search for "· teammates running", leaderIsIdle)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.