Under the hood
Internal browser-selection prompt builder simplified to just naming the tool, with instruction text moved elsewhere
What
An internal function used to build the mandatory browser-selection instructions was simplified. It previously constructed the full multi-paragraph instruction text itself; now it just returns a short phrase naming the tool to use (like 'the X tool') or a fallback mentioning the ask-user tool. The actual instruction text is now built elsewhere.
Why
This is an internal restructuring of how browser-selection prompts are assembled; it doesn't change what instructions Claude ultimately receives, just how the code produces them.
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The finding does not say what replaced the removed text-building logic beyond suspecting it moved into related new helpers, so the net…