Undo Last Operation

I'll help you rollback the last destructive operation performed by Claude DevStudio commands.

Token Optimization Strategy

Target: 80% reduction (2,000-3,000 → 400-600 tokens)

Core Optimization Patterns

1. Pure Git Operations (90% savings)

• All undo operations use git commands (external tools)
• No file reading required - git provides all context
• Git log shows what changed (timestamps, commits, files)
• Git status reveals uncommitted changes
• Git diff for change preview (optional, user confirmation only)
• Example: git reset --hard HEAD~1 (0 tokens, fully external)

2. Early Exit on Clean State (95% savings)

• Check git status before any analysis
• If working tree clean and no recent commits → exit immediately
• If no backups exist → exit with "nothing to undo"
• Skip entire recovery workflow on clean state
• Example: Clean state detection in 50 tokens vs 2,000 for full workflow

3. Template-Based Recovery Strategies (70% savings)

• Pre-defined undo strategies (no analysis required):
  • Uncommitted changes → git reset --hard HEAD
  • Last commit → git reset --soft HEAD~1 or git revert HEAD
  • Multiple commits → git reset --soft HEAD~N
  • Specific file → git checkout HEAD -- <file>
  • Stashed changes → git stash apply or git stash pop
• Select strategy from git state, apply template
• No complex reasoning about recovery approaches

4. Git Log for Context (0 additional tokens)

• git log --oneline -5 shows recent commits (external)
• Commit messages describe what would be undone
• No need to read files to understand changes
• User can decide based on commit history alone

5. Session State for Undo History (80% savings on repeat)

• Track recent operations in undo/history.json
• Record: operation type, affected files, git ref
• Resume undo decisions from previous sessions
• Skip analysis if operation was just executed
• Cache validity: Until next git commit

6. Backup Detection via Glob (95% savings)

• Use Glob to check for undo/backups/* directory
• If backups exist → list them with timestamps
• No need to read backup contents initially
• Only read backup if user selects it for restoration

7. Bash-Based Operations (external tool)

• All git commands via Bash (no token cost)
• Backup creation: cp or tar commands
• File restoration: git or cp commands
• Change validation: git diff (only if requested)

8. Progressive Disclosure (Confirmation Only)

• Level 1: Quick state check (50 tokens) - "You have uncommitted changes"
• Level 2: Strategy suggestion (100 tokens) - "I can undo with git reset"
• Level 3: Preview changes (300 tokens) - Only if user asks "what would be undone?"
• Level 4: Execute (50 tokens) - Run single git command

Optimization Workflow

Clean State (50 tokens):

# 1. Quick state check (50 tokens via Bash)
git status --porcelain
git log --oneline -1

# If both empty/clean → EXIT
"Nothing to undo - working tree is clean"

Uncommitted Changes (200-300 tokens):

# 1. Detect uncommitted changes (50 tokens)
git status --short

# 2. Strategy template (100 tokens)
"You have uncommitted changes. I can:
1. Discard all changes: git reset --hard HEAD
2. Stash changes: git stash
3. Discard specific files: git checkout HEAD -- <files>"

# 3. Execute selected strategy (50 tokens)
Bash: git reset --hard HEAD

Last Commit (250-350 tokens):

# 1. Show recent commit (50 tokens)
git log --oneline -1

# 2. Strategy template (150 tokens)
"Undo last commit (keeps changes as uncommitted):
   git reset --soft HEAD~1
Or revert commit (creates new commit):
   git revert HEAD"

# 3. Execute (50 tokens)
Bash: git reset --soft HEAD~1

Multiple Commits (300-400 tokens):

# 1. Show recent commits (100 tokens)
git log --oneline -5

# 2. Strategy selection (150 tokens)
"How many commits to undo? Recent commits:
   abc1234 Fix bug
   def5678 Add feature
   ghi9012 Update config"

# 3. Execute (50 tokens)
Bash: git reset --soft HEAD~2

Backup Restoration (400-600 tokens):

# 1. Glob for backups (50 tokens)
Glob: undo/backups/*

# 2. List backups with timestamps (100 tokens)
"Available backups:
   2026-01-27_14-30-backup.tar.gz (30 minutes ago)
   2026-01-27_10-15-backup.tar.gz (4 hours ago)"

# 3. User selects backup (50 tokens)
Input: "Use 14-30 backup"

# 4. Restore backup (200 tokens)
Bash: tar -xzf backup.tar.gz
Git: git add . && git commit -m "Restored from backup"

Token Budget by Operation

Average Reduction: 80-85% (exceeds 80% target)

Caching Strategy

Session Files (local project):

• undo/history.json - Recent operations with git refs and affected files
• undo/backups/ - Timestamped backup archives

Shared Cache Files (.claude/cache/):

• undo/git-state.json - Current branch, recent commits, working tree status
• undo/strategies.json - Pre-defined recovery templates

Cache Validity:

• Git state cache: Valid until next commit or working tree modification
• History cache: Valid for current session (cleared on new git commit)
• Backup cache: Valid until backups directory changes

Optimization Commands

Explicit Operations:

/undo                          # Auto-detect and undo last change (200-600 tokens)
/undo uncommitted              # Reset working tree (200 tokens)
/undo commit                   # Undo last commit (250 tokens)
/undo commit 3                 # Undo last 3 commits (300 tokens)
/undo file src/app.js          # Restore specific file (250 tokens)
/undo backup                   # List and restore from backups (400-600 tokens)

Expected Token Usage:

• Clean state detection: 50 tokens (exit early)
• Uncommitted changes undo: 200-300 tokens
• Single commit undo: 250-350 tokens
• Multiple commits undo: 300-400 tokens
• Backup restoration: 400-600 tokens

Optimization Status: ✅ Optimized (Phase 2 Batch 3D-F, 2026-01-26) Average Reduction: 80-85% (2,000-3,000 → 400-600 tokens)

Anti-Patterns to Avoid

❌ Don't Read Files to Understand Changes:

# Bad: Read changed files (2,000 tokens)
Read src/app.js
Read src/utils.js
Read package.json
# Then analyze what changed

# Good: Use git diff or git log (external, 0 tokens)
Bash: git diff --stat HEAD
Bash: git log --oneline -5

❌ Don't Analyze Complex Recovery Strategies:

# Bad: Reason about recovery approaches (1,500 tokens)
Think about: What if file X depends on file Y?
Consider: Should we use reset or revert?
Analyze: Impact on remote branches

# Good: Use template strategies (100 tokens)
Template: Uncommitted → git reset --hard
Template: Last commit → git reset --soft HEAD~1

❌ Don't Load Backup Contents for Selection:

# Bad: Read all backups to show options (3,000 tokens)
Read undo/backups/backup1.tar.gz (extracted)
Read undo/backups/backup2.tar.gz (extracted)

# Good: Show file names with timestamps (100 tokens)
Glob: undo/backups/*.tar.gz
List with: ls -lh (shows size and timestamp)

❌ Don't Perform Speculative Analysis:

# Bad: Analyze "what could be undone" (1,000 tokens)
Check git log → analyze all commits
Check git diff → analyze all changes
Check backups → analyze all backup contents

# Good: Show status, let user decide (50-150 tokens)
git status --short
git log --oneline -5
# User picks what to undo

Recovery Options

I'll check for available recovery methods:

1. Git-based Recovery

• Check uncommitted changes
• Review recent commits
• Identify safe restore points

2. Project Backups

• Look for undo/backups/ in your project
• Check for operation-specific backups
• Verify backup integrity

3. Change Analysis

• Show what was modified
• Identify scope of changes
• Suggest targeted recovery

Recovery Process

Based on what I find, I can:

1. Restore from Git - If changes haven't been committed yet
2. Use project backups - If backups exist from previous operations
3. Selective restoration - Choose specific files to restore

I'll analyze the situation and suggest the safest recovery method.

If multiple restore options exist, I'll:

• Show you what each option would restore
• Explain the implications
• Let you choose the best approach

Important: I will NEVER:

• Add "Co-authored-by" or any Claude signatures
• Include "Generated with Claude Code" or similar messages
• Modify git config or user credentials
• Add any AI/assistant attribution to the commit

This ensures you can confidently undo operations without losing important work.