Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.260 ·

copy_from asset id validation rules

copy_from asset ids now have strict validation rules with specific denial messages.

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal2worth watching, 1 to 5
AreaArtifactswhat it touches
KindInternal Changesin v2.1.260,
Under the hood Nothing to try yet No documentation found

copy_from asset ids now have strict validation rules with specific denial messages.

Asset ids passed to copy_from must be exactly 32-character ids matching list_assets output, contain no duplicates, and stay within a fixed per-call cap; violations now produce specific denial messages rather than being silently truncated.

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Names in the bundlecopy_from

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