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## What changed - Default `tools.update_plan.enabled` to `false`; users can explicitly enable it to expose `update_plan`. - Remove bundled `update_plan` guidance from model, collaboration-mode, multi-agent, compaction, prewarm, and goal-continuation prompts when the tool is disabled. - Preserve custom base instructions, model catalog instructions, collaboration policies, and user goal text even when they mention planning or `update_plan`. ## Testing - Cover default and explicitly enabled tool registration, prompt consistency across request paths, and preservation of custom instructions. GitOrigin-RevId: a53964e6e72f98e2557dd3090fdb7caccb956527