Under the hood
Useful2 Signal2
Skill listings returned by hooks are now length-checked so malformed entries are rejected.
What's wrong with this entry?
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skill_listing
What
A hook that returns a skill_listing must now return an array whose length is capped and whose entries are strings under a length cap. Previously any array was accepted, so malformed entries reached the rest of Claude Code.
Evidence
skill_listing
Strings lifted out of the shipped bundle, so the claim above can be checked against them.