You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SkillsArea: what it touches
ImprovementsKind: in v2.1.234,
ImprovementsSection of the release
What
Claude is now told explicitly that skill files on disk, including synced copies of your account skills, are a read-only cache and that editing them does not change the saved skill. Three variants of this guidance exist for different session shapes.
Details
One variant points at a tool for creating or updating a skill directly, one says to propose the skill with a different tool, and one says to produce a .skill zip or a single SKILL.md and hand it over.
That last variant warns there is no signal about whether you saved the file, so Claude should report the skill as delivered and never as saved.
A separate fragment carves out plugin-owned skills, which are customizable through their plugin.
Which variant applies depends on the session type; the selection logic is not part of this change.
Evidence
report the skill as delivered, never as saved
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
