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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

Prompt-cache-break explanation split into its own function

Under the hood
Useful1 Signal0
Caching

The reasons your prompt cache was invalidated now come from one function; wording is the same.

What

The logic that lists why the prompt cache was invalidated (model, system prompt, tools, betas, effort and so on) moved into a separate function. Wording and telemetry fields are unchanged.

Evidence

defer_loading presence flipped (deferred-tool hint section, inc-5316)

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.248 →