Pier_v1/.hmcmkit/knowledge/skills/rollback/SKILL.md

name, classification, classification-reason, deprecation-risk, description, argument-hint, user-invocable, allowed-tools, imports, next-skill, pdca-phase, task-template

name	classification	classification-reason	deprecation-risk	description	argument-hint	user-invocable	allowed-tools	imports	next-skill	pdca-phase	task-template
rollback	workflow	Checkpoint and rollback management persists regardless of model advancement	none	Manage PDCA checkpoints and rollback — create, list, restore for safe recovery. Triggers: rollback, checkpoint, restore, undo, 롤백, 체크포인트, 복원.	[list|to|phase|reset] [target]	true	Read Write Glob Grep Bash AskUserQuestion		null	null	[Rollback] {action}

Rollback Skill

User-invocable skill for checkpoint management and PDCA state rollback.

Arguments

Argument	Description	Example
(none)	List available checkpoints (same as list)	/rollback
list	List all available checkpoints	/rollback list
to <checkpoint-id>	Restore to a specific checkpoint	/rollback to cp-1710842700000
phase	Rollback to previous PDCA phase	/rollback phase
reset <feature>	Reset feature to initial (idle) state	/rollback reset user-auth

Action Details

list (Default)

List all available checkpoints for the current or specified feature.

1. Read checkpoint metadata from .hmcmkit/checkpoints/
2. Filter by current active feature (or show all if no active feature)
3. Sort by timestamp (newest first)
4. Display formatted checkpoint list

Checkpoint Metadata Schema:

{
  "id": "cp-1710842700000",
  "feature": "user-auth",
  "phase": "design",
  "type": "auto",
  "timestamp": "2026-03-19T10:30:00.000Z",
  "description": "Auto-checkpoint before Do phase",
  "pdcaStatus": { "phase": "design", "matchRate": 0, "iterationCount": 0 },
  "files": ["docs/02-design/features/user-auth.design.md"]
}

Output Format:

--- Checkpoints: user-auth ------------------------
ID                    Phase    Type   Date                Description
cp-1710842700000      design   auto   2026-03-19 10:30   Before Do phase
cp-1710839100000      plan     auto   2026-03-19 09:25   Before Design phase
cp-1710835500000      idle     manual 2026-03-19 08:15   Manual save point
---------------------------------------------------
Total: 3 checkpoints

Usage: /rollback to cp-1710842700000

to

Restore state to a specific checkpoint.

1. Validate the checkpoint ID exists in .hmcmkit/checkpoints/
2. Read the checkpoint metadata and saved state
3. Display what will be restored (phase, files, status)
4. Require user confirmation via AskUserQuestion (always, regardless of automation level)
5. On confirmation: a. Create a safety checkpoint of current state (before rollback) b. Restore pdca-status.json to the checkpoint's saved state c. Restore any saved file snapshots d. Write audit log: checkpoint_restored e. Display confirmation with restored state
6. On rejection: Cancel and display current state

Safety Rule: Rollback operations ALWAYS require user confirmation, even at L4 (Full-Auto). This is a destructive operation.

phase

Rollback to the previous PDCA phase.

1. Read current feature state from .hmcmkit/state/pdca-status.json
2. Determine previous phase using the PDCA phase order: idle <- pm <- plan <- design <- do <- check <- act <- report <- archived
3. If current phase is idle, display: "Already at initial state. Nothing to rollback."
4. Display the phase transition that will occur
5. Require user confirmation via AskUserQuestion
6. On confirmation: a. Create auto-checkpoint of current state b. Use state-machine.transition() with ROLLBACK event c. Update pdca-status.json with previous phase d. Write audit log: phase_rollback e. Display: "Rolled back from {current} to {previous}"

Phase Rollback Map:

Current Phase	Rolls Back To
pm	idle
plan	pm (or idle if PM was skipped)
design	plan
do	design
check	do
act	check
report	check
archived	report

reset

Reset a feature to its initial (idle) state.

1. Validate the feature exists in pdca-status.json
2. Display current feature state and what will be lost
3. Require user confirmation via AskUserQuestion with warning: "This will reset ALL PDCA progress for {feature}. Documents in docs/ will NOT be deleted."
4. On confirmation: a. Create auto-checkpoint of current state b. Use state-machine.transition() with RESET event c. Clear feature from active features list d. Reset all metrics (matchRate, iterationCount, etc.) e. Write audit log: feature_reset f. Display: "Feature {feature} reset to idle state. PDCA documents preserved in docs/."

Important: Reset does NOT delete documents from docs/. It only resets the PDCA status tracking. Use /pdca cleanup to remove archived status entries.

Checkpoint Types

Type	Trigger	Description
auto	Phase transition (Design->Do)	Automatic checkpoint at key transitions
manual	User command	User-created save point
phase_transition	Any phase change	Lightweight state snapshot
pre_rollback	Before rollback	Safety checkpoint before destructive operation

State Files

File	Purpose
.hmcmkit/checkpoints/cp-{timestamp}.json	Checkpoint metadata and state snapshot
.hmcmkit/state/pdca-status.json	Current PDCA status (modified on rollback)

Module Dependencies

Module	Function	Usage
lib/control/checkpoint-manager.js	listCheckpoints()	List available checkpoints
lib/control/checkpoint-manager.js	createCheckpoint()	Create new checkpoint
lib/control/checkpoint-manager.js	restoreCheckpoint()	Restore to checkpoint
lib/pdca/state-machine.js	transition()	Execute ROLLBACK/RESET events
lib/audit/audit-logger.js	writeAuditLog()	Record rollback operations

Usage Examples

# List checkpoints
/rollback

# Restore to specific checkpoint
/rollback to cp-1710842700000

# Rollback to previous phase
/rollback phase

# Reset feature completely
/rollback reset user-auth