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.
The "deep search" (: prefix) feature for searching within message content has been removed from the session resume dialog, simplifying the search interface.
Evidence
Removed tengu_session_deep_search_toggled telemetry event at line 8130
Strings lifted out of the shipped bundle, so the claim above can be checked against them.