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## Why `multi_agents_v2` is meant to be independently gated from the older `collab` feature. The tool registry still treated the collaboration-style agent tools as `collab`-only, so enabling `multi_agents_v2` without `collab` omitted the v2 agent tools. Review and guardian sub-sessions also need to keep agent spawning disabled even when the outer session has `multi_agents_v2` enabled. ## What changed - Include the collab-backed agent tools when either `multi_agents_v2` or `collab` is enabled. - Explicitly disable `multi_agents_v2` for review and guardian review sub-sessions, matching the existing `spawn_csv` and `collab` restrictions. - Add a registry test that enables `multi_agents_v2`, disables `collab`, and verifies the v2 agent tools are present while legacy `send_input` and `resume_agent` remain hidden. ## Testing - Added `test_build_specs_multi_agent_v2_does_not_require_collab_feature`.