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name: unity-history description: Manage undo/redo history over the native undo stack

Before calling any skill in this module: if you are about to call a skill with parameters guessed from its name or description, STOP — read this file (or fetch its schema via GET /skills/recommend?includeSchema=true) first. If you already have the parameter definitions from recommend/schema, you may proceed straight to dryRun.

Triggers

• Reviewing or navigating undo history
• Stepping undo/redo
• Auditing what changed
• 查看或浏览撤销历史、逐步撤销/重做、审查改动

History Skills

Manage Unity Editor undo/redo history.

Operating Mode

本模块 history_get_current（纯读）标 SkillMode.SemiAuto，三档下均可直接执行；history_undo / history_redo 会改变场景状态，为默认 SkillMode.FullAuto（Operation=Execute），Approval 模式下需 grant。不含 NeverInSemi 高危 skill。

history_undo / history_redo replay Unity's own native Undo/Redo stack, whose contents cannot be classified by write category the way workflow module's task snapshots can, so unlike workflow_undo_task / workflow_session_undo they carry no payload-level SURFACE_EXCLUDED check.

DO NOT (common hallucinations):

• history_list / history_get do not exist → use history_get_current for current undo group
• history_clear does not exist → Unity undo history cannot be cleared via API
• history_save does not exist → undo history is managed by Unity automatically

Routing:

• For simple undo/redo → history_undo / history_redo (this module) or editor_undo / editor_redo
• For persistent task-level undo → use workflow module
• For conversation-level undo → use workflow module's workflow_session_undo

Skills

history_undo

Undo the last operation (or multiple steps).

Parameter	Type	Required	Default	Description
steps	int	No	1	Number of undo steps to perform

Returns: { success, undoneSteps }

history_redo

Redo the last undone operation (or multiple steps).

Parameter	Type	Required	Default	Description
steps	int	No	1	Number of redo steps to perform

Returns: { success, redoneSteps }

history_get_current

Get the name of the current undo group.

No parameters.

Returns: { success, currentGroup, groupIndex }

Exact Signatures

Exact names, parameters, defaults, and returns are defined by GET /skills/schema or unity_skills.get_skill_schema(), not by this file.