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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 v2.1.233 14 Aug 2026

WebFetch cache lifetime is now configurable

Use it now

Useful4 Signal2

WebFetch Notable

You can set how long WebFetch keeps pages cached, in milliseconds.

CLAUDE_CODE_WEBFETCH_CACHE_TTL_MS

What

CLAUDE_CODE_WEBFETCH_CACHE_TTL_MS sets how long fetched pages stay cached, in milliseconds. Without it the built-in default applies. The value is read once on first use and also drives the cache duration shown in WebFetch output.

Details

Validated as a digits-only integer with a minimum of 1.

Usage

CLAUDE_CODE_WEBFETCH_CACHE_TTL_MS=900000 claude

Evidence

CLAUDE_CODE_WEBFETCH_CACHE_TTL_MS

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

See this entry in the whole of v2.1.233 →