You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SkillsArea: what it touches
ImprovementsKind: in v2.1.248,
ImprovementsSection of the release
What
The instructions Claude follows when you ask it to save a skill now come in three variants: one pointing at a save tool, one saying skills cannot be created in this session and to propose one instead, and one saying to deliver the skill as a .skill zip or a single SKILL.md file, with an explicit note that Claude never learns whether you saved it and must report the skill as delivered rather than saved.
Details
All three state that skill files on disk, including synced copies of your account skills, are a read-only cache and must not be edited in place.
A fourth fragment carves out skills owned by plugins.
Evidence
You get no signal whether they saved it: report the skill as delivered, never as saved.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
