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 Task tool's system prompt has been condensed and reorganised. The "When NOT to use" section is now streamlined, examples are updated, and the isolation: "worktree" option and agent resumption via to field are better documented.
Evidence
Task tool help (search for "Launch a new agent to handle complex, multi-step tasks")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.