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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.248 27 Aug 2026

Feature flag holder supports pinned values

Under the hood

Useful2 Signal3

Internals

The runtime feature holder can now hold pinned values and gained a deferred user-file send flag.

What

The object holding runtime feature values gained a slot for pinned values, dropped a tab-aware separator flag and added a deferred user-file send flag.

Evidence

pinnedFeatureValues

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

See this entry in the whole of v2.1.248 →