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 v2.1.275 ·

Cache-key comparators for tool/hook/skill descriptions gain explicit size measurement

Internal caching for tool/hook/skill descriptions now explicitly measures text size

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaElsewherewhat it touches
KindInternal Changesin v2.1.275,
Under the hood

Internal caching for tool/hook/skill descriptions now explicitly measures text size

What

Internal comparators that decide when a cache should be invalidated for tool descriptions, hook text, prompt sections, and skill text now also explicitly measure the size of that text, in addition to the equality checks they already did.

Why

This is an internal caching refinement with no directly described effect on user-facing behavior.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtThe finding does not say what the added size measurement is used for or what behavior it changes.

See this entry in the whole of v2.1.275 →