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Similarly to Glob, the Grep tool description's line recommending the Agent tool for "open-ended searches requiring multiple rounds" is now suppressed in non-default steering modes. In counter_steer and no_nudges modes the note is omitted entirely.
Evidence
Conditional block around "Use ${$o} tool for open-ended searches requiring multiple rounds" in Grep description (search for "open-ended searches requiring multiple rounds")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.