# M16-GAP-00134 Status status: done task: action.select_box operator LOCAL_EXACT slice updated: 2026-08-20 America/New_York scope: Action Editor box selection on `object:WebGapSelectBoxObject`. evidence: - Blender executes `bpy.ops.action.select_box(mode="SET")` over the frame-3 region coordinates; only frame 3 is selected on all channels. - Desktop and WASM/Main expose matching frames and selected flags; save/reopen is exact. - Malformed Blend input is rejected without mutating Main animation data. - Generator, desktop checker, npm comparator, direct comparator, context handoff, and governance exit 0. knownRisk: This slice covers SET mode and a frame-only box; ADD/SUB/channel-range selection remains separate behavior. nextTask: `M16-GAP-00135`