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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.221 ·

The Agent SDK validates skills entries before turning them into permission rules

The SDK now rejects malformed skill names with a clear reason instead of creating a rule that never matches.

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ImprovementsKind: in v2.1.221,
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What

Each name in the SDK skills option is now checked before it becomes a Skill(name) allowed-tool rule, so a name that could never match is reported instead of silently producing a dead rule.

Details
  • Rejects empty names, unpaired surrogates, leading or trailing whitespace, parentheses, commas, control characters, wildcard suffixes, a leading slash, consecutive backslashes and a trailing unpaired backslash.
  • Each rejection carries a specific explanation of why the resulting rule could not match.
  • Applies to everyone using the SDK skills option; no gate.
Evidence

Invalid skill name '*': use skills: 'all' to enable every skill.

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

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Names in the bundleskills

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