Under the hood
Useful2 Signal2
Plugin manifest and uninstall failures now say whether something could not be read or was invalid.
What's wrong with this entry?
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What
Failing to read, parse or schema-validate a plugin manifest, including the plugin-manifest frontmatter in a SKILL.md, now raises a structured error with a short summary and a code so callers can tell "could not read it" from "it is invalid". CLI uninstall failures are typed the same way.
Evidence
plugin manifest failed schema validation, plugin manifest is not valid JSON
Strings lifted out of the shipped bundle, so the claim above can be checked against them.