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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 v2.1.19 23 Jan 2026

Global Prompt Cache Scope Support

What

Added support for global-scoped prompt caching.

Details

Prompt cache can now specify scope: "global" for cross-session caching
Part of the ephemeral cache control structure
Works with the existing 1-hour TTL experiment

Evidence

iMA() at line 525119 (cache control with scope: A when A === "global")

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

See this entry in the whole of v2.1.19 →