Under the hood
WebFetch's internal prompt-building switched from a simple on/off flag to a named mode string
What
The internal code that builds the description text for the WebFetch tool used to take a simple true/false flag (leanPrompt) that controlled a single special-case explanation about claude.ai artifacts. It now instead takes a mode, a text value that defaults to "none", passed through to the helper functions that assemble the description.
Why
A mode that can hold more than two values suggests more variations of the WebFetch description are possible than the old on/off flag allowed, though what those other modes do isn't specified. The visible WebFetch description text itself is unchanged in this release.
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What the mode values other than the default "none" actually change in the description is not stated.