History Skills

Undo, redo and inspect the current undo group of the Unity Editor's native undo stack. Parameters come from the schema (GET /skills/schema?names=<skill>&wire=v2); execution and dryRun rules: root SKILL.md.

The skills are defined in WorkflowSkills.cs (category Workflow) and documented here as well as in the workflow module.

When to use

• Reviewing or navigating undo history
• Stepping undo and redo
• Auditing what changed

Rules

• history_get_current is read-only and runs under Approval. history_undo and history_redo change scene state and need a grant under Approval.
• history_undo and history_redo replay Unity's own native undo stack. Its entries cannot be classified by write category the way workflow task snapshots can, so they carry no payload-level SURFACE_EXCLUDED check. workflow undo (workflow_undo_task, workflow_session_undo) does carry that check.
• For persistent task-level or conversation-level undo, use the workflow module. For simple undo and redo, the editor skills editor_undo and editor_redo are the alternative.