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.
The delegate permission mode now has an explicit description in the schema: "Delegate mode, restricts team leader to only Teammate and Task tools." Previously the mode existed in the enum but lacked a description string.
Evidence
Delegate mode documentation (search for "delegate" in the permission mode .describe() string)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.