Timeline Skills

Create and modify Unity Timeline assets — add typed tracks, drop clips on tracks, bind objects, set duration / wrap mode, and play/pause/stop the editor preview through the PlayableDirector.

Operating Mode

• Approval：查询类 skill（timeline_list_tracks，源码标 SkillMode.SemiAuto）直接执行；其余变更/播放类（timeline_create / add_*_track / timeline_add_clip / timeline_set_duration / timeline_play / timeline_set_binding，标 SkillMode.FullAuto）需用户 grant，grant 后服务端一步执行返结果。
• Auto / Bypass：未被禁列表拦截的 skill 直接执行。
• 本模块含 Delete 类 skill：timeline_remove_track 标记为 SkillOperation.Delete，被 IsForbiddenInSemi 静态拦截 —— 仅 Bypass 模式或加入 Allowlist 才能调用。
• timeline_play 仅驱动 Editor 预览（PlayableDirector.Evaluate / Play 在编辑器上下文），不会进入 Play mode。

DO NOT (common hallucinations):

• timeline_create_animation / timeline_add_track do not exist → use the typed track skills: timeline_add_animation_track, timeline_add_audio_track, timeline_add_activation_track, timeline_add_control_track, timeline_add_signal_track
• timeline_add_keyframe does not exist → Timeline uses clips, not direct keyframes; use timeline_add_clip
• timeline_set_duration sets the Timeline asset duration, not individual clip duration

Routing:

• For Animator parameters/states → use animator module
• For runtime animation playback → use editor_play or write C# via script module