You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
SkillsArea: what it touches
ImprovementsKind: in v2.1.238,
What probably matters to youSection of the release
What
The Skill tool's description was rewritten: background skills return only an agent name, skills can be named with a scope such as apps/web:deploy, and an already-loaded skill block should be followed rather than invoked again. In coordinator mode an extra paragraph is appended saying the coordinator's own use is read-only, with no forking, permission grants, hooks or preamble shell commands, and that execution happens in workers.
Details
The addendum requires CLAUDE_CODE_COORDINATOR_MODE, and locally also a remote or cowork context; without those the base description is used.
Evidence
In a coordinator session, the coordinator's own use of this tool is read-only
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
