Add comprehensive Claude Code advanced features
Added three new major feature categories with complete documentation and examples: ## New Features ### 07-hooks/ - Event-driven automation with 6 example hook scripts - Pre/post tool hooks, session hooks, and git hooks - Auto-formatting, security scanning, test automation - Complete documentation with best practices ### 08-checkpoints/ - Conversation state snapshots and rewind capability - Safe experimentation and approach comparison - Real-world examples: DB migration, performance optimization, UI iteration - Checkpoint management commands and workflows ### 09-advanced-features/ - Planning Mode: detailed implementation plans before coding - Extended Thinking: deep reasoning for complex problems - Background Tasks: long-running operations without blocking - Permission Modes: unrestricted, confirm, read-only, custom - Headless Mode: CI/CD integration and automation - Session Management: multiple work sessions - Interactive Features: keyboard shortcuts, command history - 10+ configuration examples for different scenarios ## Documentation Updates - README.md: Added sections for all new features with examples - INDEX.md: Updated with new categories, file listings, and search keywords - QUICK_REFERENCE.md: Added quick reference for new features - claude_concepts_guide.md: Comprehensive guide sections for new concepts ## Statistics - Total files: 90+ (up from 71) - Categories: 9 (up from 6) - New hook scripts: 6 - New documentation files: 10+ - Configuration examples: 10+ scenarios All examples are production-ready and follow Claude Code best practices. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Luong NGUYEN
426
08-checkpoints/README.md
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08-checkpoints/README.md
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# Checkpoints and Rewind
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Checkpoints allow you to save conversation state and rewind to previous points in your Claude Code session. This is invaluable for exploring different approaches, recovering from mistakes, or comparing alternative solutions.
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## What Are Checkpoints?
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Checkpoints are snapshots of your conversation state, including:
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- All messages exchanged
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- File modifications made
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- Tool usage history
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- Session context
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## Key Concepts
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### Checkpoint
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A saved point in your conversation that you can return to later.
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### Rewind
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The action of returning to a previous checkpoint, discarding all changes made after that point.
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### Branch Point
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A checkpoint where you explored multiple different approaches.
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## Creating Checkpoints
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### Automatic Checkpoints
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Claude Code automatically creates checkpoints at key moments:
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- Before major refactoring operations
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- Before potentially destructive commands
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- At regular intervals during long sessions
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- Before running tests or builds
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### Manual Checkpoints
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Create checkpoints explicitly:
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```
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User: /checkpoint save "Before API refactor"
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```
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```
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User: /checkpoint create pre-deployment
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```
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## Using Checkpoints
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### List Checkpoints
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View all available checkpoints:
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```
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User: /checkpoint list
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```
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Output:
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```
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Checkpoints:
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1. [2025-11-08 10:30:15] Auto: Before file edit
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2. [2025-11-08 10:45:22] Manual: Before API refactor
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3. [2025-11-08 11:02:10] Auto: Before git commit
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4. [2025-11-08 11:15:45] Manual: pre-deployment
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```
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### Rewind to Checkpoint
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Return to a previous checkpoint:
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```
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User: /checkpoint rewind 2
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```
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Or by name:
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```
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User: /checkpoint rewind "Before API refactor"
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```
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### Compare Checkpoints
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See what changed between checkpoints:
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```
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User: /checkpoint diff 2 4
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```
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## Practical Examples
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### Example 1: Exploring Different Approaches
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```
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User: Let's add a caching layer to the API
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Claude: I'll add Redis caching to your API endpoints...
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[Makes changes]
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User: /checkpoint save "Redis approach"
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User: Actually, let's try in-memory caching instead
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Claude: I'll rewind and implement in-memory caching...
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[Uses /checkpoint rewind to undo Redis changes]
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[Implements in-memory caching]
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User: /checkpoint save "In-memory approach"
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User: /checkpoint diff "Redis approach" "In-memory approach"
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Claude: Here are the differences between the two approaches...
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```
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### Example 2: Recovering from Mistakes
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```
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User: Refactor the authentication module to use JWT
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Claude: I'll refactor the authentication module...
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[Makes extensive changes]
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User: Wait, that broke the OAuth integration. Let's go back.
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Claude: I'll rewind to before the refactoring...
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/checkpoint rewind "Before auth refactor"
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User: Let's try a more conservative approach this time
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```
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### Example 3: Safe Experimentation
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```
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User: /checkpoint save "Working state before experiment"
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User: Let's try rewriting this in a functional style
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Claude: [Makes experimental changes]
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User: The tests are failing. Let's rewind.
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Claude: /checkpoint rewind "Working state before experiment"
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```
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### Example 4: Comparing Solutions
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```
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User: I want to compare two database designs
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Claude: I'll create the first design...
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[Implements Schema A]
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User: /checkpoint save "Schema A"
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Claude: /checkpoint rewind to start
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[Implements Schema B]
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User: /checkpoint save "Schema B"
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User: /checkpoint compare "Schema A" "Schema B"
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Claude: Here's a comparison of both schemas:
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- Schema A uses normalization...
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- Schema B uses denormalization...
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```
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## Checkpoint Management
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### View Checkpoint Details
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```
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User: /checkpoint show 2
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```
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Output:
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```
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Checkpoint #2: "Before API refactor"
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Created: 2025-11-08 10:45:22
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Files modified: 5
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- src/api/endpoints.ts
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- src/api/middleware.ts
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- src/utils/cache.ts
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- tests/api.test.ts
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- package.json
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Message count: 23
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Tools used: Read, Edit, Bash
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```
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### Delete Checkpoints
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```
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User: /checkpoint delete 1
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```
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Or delete all:
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```
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User: /checkpoint clear
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```
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### Export Checkpoints
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Save checkpoint for later use:
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```
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User: /checkpoint export "Before API refactor" ~/checkpoints/api-refactor.json
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```
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### Import Checkpoints
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Restore from saved checkpoint:
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```
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User: /checkpoint import ~/checkpoints/api-refactor.json
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```
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## Advanced Usage
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### Branching Strategy
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```markdown
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Main conversation
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├─ Checkpoint 1: "Initial state"
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│
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├─ Branch A: Redis implementation
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│ ├─ Checkpoint 2: "Redis complete"
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│ └─ Checkpoint 3: "Redis with clustering"
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│
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└─ Branch B: In-memory implementation
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├─ Checkpoint 4: "In-memory complete"
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└─ Checkpoint 5: "In-memory optimized"
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```
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### Checkpoint Scripts
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Create automated checkpoint workflows:
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```bash
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#!/bin/bash
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# create-safe-checkpoint.sh
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# Create checkpoint
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echo "/checkpoint save \"Safe point - $(date +%Y%m%d-%H%M%S)\"" | claude-code
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# Run risky operation
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echo "$1" | claude-code
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# Check if successful
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if [ $? -ne 0 ]; then
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echo "/checkpoint rewind last" | claude-code
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echo "Operation failed, reverted to checkpoint"
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fi
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```
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### Checkpoint Hooks
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Automatically create checkpoints on events:
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```json
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{
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"hooks": {
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"PreToolUse:Edit": "~/.claude/hooks/create-checkpoint.sh",
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"PreCommit": "~/.claude/hooks/checkpoint-before-commit.sh"
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}
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}
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```
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Example hook:
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```bash
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#!/bin/bash
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# ~/.claude/hooks/create-checkpoint.sh
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FILE=$1
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TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")
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# Create checkpoint before editing important files
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if [[ "$FILE" =~ (config|database|auth|api) ]]; then
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echo "Creating checkpoint before editing $FILE"
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# Trigger checkpoint creation
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fi
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```
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## Best Practices
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### When to Create Checkpoints
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✅ **Do create checkpoints:**
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- Before major refactoring
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- Before trying experimental approaches
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- Before potentially breaking changes
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- At the end of successful feature implementations
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- Before switching to a different task
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❌ **Don't create checkpoints:**
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- After every single change (too granular)
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- For trivial changes (typo fixes, formatting)
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- Without descriptive names
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### Naming Conventions
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Good checkpoint names:
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- ✅ "Before auth refactor"
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- ✅ "Working state - all tests passing"
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- ✅ "Pre-deployment v1.2.0"
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- ✅ "Schema A - normalized design"
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Poor checkpoint names:
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- ❌ "checkpoint1"
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- ❌ "temp"
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- ❌ "test"
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- ❌ "backup"
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### Checkpoint Hygiene
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- **Limit active checkpoints**: Keep 5-10 meaningful checkpoints
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- **Delete old checkpoints**: Remove outdated ones regularly
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- **Use descriptive names**: Make it easy to identify later
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- **Document major checkpoints**: Add notes about what was accomplished
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## Configuration
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Configure checkpoint behavior in settings:
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```json
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{
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"checkpoints": {
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"autoCheckpoint": true,
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"autoCheckpointInterval": 30,
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"maxCheckpoints": 20,
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"compressionEnabled": true,
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"includeFileContents": true
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}
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}
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```
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### Configuration Options
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- `autoCheckpoint`: Enable automatic checkpoints
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- `autoCheckpointInterval`: Minutes between auto-checkpoints
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- `maxCheckpoints`: Maximum number of checkpoints to retain
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- `compressionEnabled`: Compress checkpoint data
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- `includeFileContents`: Include full file contents in checkpoints
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## Limitations
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- Checkpoints are session-specific
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- External changes (outside Claude Code) are not tracked
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- Large file changes may increase checkpoint size
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- Some tool states may not be fully restorable
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## Troubleshooting
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### Checkpoint Too Large
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**Problem**: Checkpoint creation is slow or fails
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**Solution**:
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```json
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{
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"checkpoints": {
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"includeFileContents": false,
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"compressionEnabled": true
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}
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}
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```
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### Missing Checkpoints
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**Problem**: Expected checkpoint not found
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**Solution**:
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- Check if checkpoints were cleared
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- Verify checkpoint retention settings
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- Check disk space
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### Rewind Failed
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**Problem**: Cannot rewind to checkpoint
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**Solution**:
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- Ensure no uncommitted changes conflict
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- Check if checkpoint is corrupted
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- Try rewinding to a different checkpoint
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## Integration with Git
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Checkpoints complement (but don't replace) git:
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| Feature | Git | Checkpoints |
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|---------|-----|-------------|
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| Scope | File system | Conversation + files |
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| Persistence | Permanent | Session-based |
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| Granularity | Commits | Any point |
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| Speed | Slower | Instant |
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| Sharing | Yes | Limited |
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Use both together:
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1. Use checkpoints for rapid experimentation
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2. Use git commits for finalized changes
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3. Create checkpoint before git operations
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4. Commit successful checkpoint states to git
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## Example Workflows
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### Safe Refactoring Workflow
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```
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1. /checkpoint save "Before refactoring"
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2. Implement refactoring
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3. Run tests
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4. If tests pass: Commit to git
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5. If tests fail: /checkpoint rewind "Before refactoring"
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```
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### Feature Exploration Workflow
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```
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1. /checkpoint save "Main branch"
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2. Try approach A
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3. /checkpoint save "Approach A"
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4. /checkpoint rewind "Main branch"
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5. Try approach B
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6. /checkpoint save "Approach B"
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7. /checkpoint compare "Approach A" "Approach B"
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8. Choose best approach and commit
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```
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### Emergency Recovery Workflow
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```
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1. Notice major issue
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2. /checkpoint list
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3. Identify last known good state
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4. /checkpoint rewind <good-state>
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5. Verify system works
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6. Proceed cautiously
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```
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08-checkpoints/checkpoint-examples.md
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352
08-checkpoints/checkpoint-examples.md
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# Checkpoint Examples
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Real-world examples of using checkpoints effectively in Claude Code.
|
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## Example 1: Database Migration
|
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|
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### Scenario
|
||||
You need to migrate from MySQL to PostgreSQL but want to explore both a direct migration and a gradual dual-write approach.
|
||||
|
||||
### Workflow
|
||||
|
||||
```
|
||||
User: /checkpoint save "Before database migration"
|
||||
|
||||
User: Let's implement a direct migration from MySQL to PostgreSQL
|
||||
|
||||
Claude: I'll implement the direct migration...
|
||||
[Changes database driver, updates queries, modifies schema]
|
||||
|
||||
User: /checkpoint save "Direct migration complete"
|
||||
|
||||
User: Run the tests
|
||||
|
||||
Claude: Running tests...
|
||||
❌ 15 tests failing - connection pool issues
|
||||
|
||||
User: This approach has issues. Let's try the dual-write pattern instead.
|
||||
|
||||
Claude: I'll rewind to the starting point...
|
||||
/checkpoint rewind "Before database migration"
|
||||
|
||||
User: Now implement a dual-write pattern where we write to both databases
|
||||
|
||||
Claude: I'll implement dual-write migration...
|
||||
[Implements dual-write layer, gradual migration strategy]
|
||||
|
||||
User: /checkpoint save "Dual-write migration complete"
|
||||
|
||||
User: Run the tests
|
||||
|
||||
Claude: Running tests...
|
||||
✅ All tests passing
|
||||
|
||||
User: /checkpoint compare "Direct migration complete" "Dual-write migration complete"
|
||||
|
||||
Claude: Comparison of the two approaches:
|
||||
|
||||
Direct Migration:
|
||||
- Faster to implement
|
||||
- All-or-nothing cutover
|
||||
- Higher risk
|
||||
- Failed integration tests
|
||||
|
||||
Dual-Write Migration:
|
||||
- More complex implementation
|
||||
- Gradual, safer migration
|
||||
- Can rollback easily
|
||||
- All tests passing
|
||||
- Recommended approach ✅
|
||||
```
|
||||
|
||||
## Example 2: Performance Optimization
|
||||
|
||||
### Scenario
|
||||
Multiple performance optimization strategies to try.
|
||||
|
||||
### Workflow
|
||||
|
||||
```
|
||||
User: /checkpoint save "Baseline performance"
|
||||
|
||||
User: Let's optimize the API response time. Current: 450ms
|
||||
|
||||
Claude: I'll add database query caching...
|
||||
[Implements Redis caching]
|
||||
|
||||
User: /checkpoint save "Redis caching"
|
||||
User: Run performance tests
|
||||
|
||||
Claude: Results: 280ms average response time (38% improvement)
|
||||
|
||||
User: /checkpoint rewind "Baseline performance"
|
||||
User: Try database query optimization instead
|
||||
|
||||
Claude: I'll optimize database queries...
|
||||
[Adds indexes, optimizes N+1 queries]
|
||||
|
||||
User: /checkpoint save "Query optimization"
|
||||
User: Run performance tests
|
||||
|
||||
Claude: Results: 180ms average response time (60% improvement)
|
||||
|
||||
User: /checkpoint rewind "Baseline performance"
|
||||
User: Try response compression and CDN
|
||||
|
||||
Claude: I'll add compression and CDN...
|
||||
[Implements gzip, sets up CDN]
|
||||
|
||||
User: /checkpoint save "Compression + CDN"
|
||||
User: Run performance tests
|
||||
|
||||
Claude: Results: 320ms average response time (29% improvement)
|
||||
|
||||
User: Let's combine query optimization with caching
|
||||
|
||||
Claude: I'll rewind to query optimization and add caching...
|
||||
/checkpoint rewind "Query optimization"
|
||||
[Adds Redis caching on top of optimized queries]
|
||||
|
||||
User: /checkpoint save "Combined approach"
|
||||
User: Run performance tests
|
||||
|
||||
Claude: Results: 95ms average response time (79% improvement) 🎉
|
||||
|
||||
User: Perfect! This is the winner. Let's commit this.
|
||||
```
|
||||
|
||||
## Example 3: UI/UX Iteration
|
||||
|
||||
### Scenario
|
||||
Trying different layouts for a dashboard.
|
||||
|
||||
### Workflow
|
||||
|
||||
```
|
||||
User: /checkpoint save "Dashboard - current layout"
|
||||
|
||||
User: Let's redesign the dashboard with a sidebar layout
|
||||
|
||||
Claude: [Implements sidebar layout]
|
||||
User: /checkpoint save "Sidebar layout"
|
||||
User: Show me a screenshot
|
||||
|
||||
Claude: [Shows screenshot]
|
||||
|
||||
User: The sidebar feels cramped. Let's try a top navigation instead.
|
||||
|
||||
Claude: /checkpoint rewind "Dashboard - current layout"
|
||||
[Implements top navigation]
|
||||
User: /checkpoint save "Top navigation layout"
|
||||
User: Show me a screenshot
|
||||
|
||||
Claude: [Shows screenshot]
|
||||
|
||||
User: Better, but let's try a card-based grid layout
|
||||
|
||||
Claude: /checkpoint rewind "Dashboard - current layout"
|
||||
[Implements card grid]
|
||||
User: /checkpoint save "Card grid layout"
|
||||
User: Show me a screenshot
|
||||
|
||||
Claude: [Shows screenshot]
|
||||
|
||||
User: This is great! But can we combine the top nav with the card grid?
|
||||
|
||||
Claude: /checkpoint rewind "Card grid layout"
|
||||
[Adds top navigation to card grid]
|
||||
User: /checkpoint save "Top nav + card grid"
|
||||
|
||||
User: Perfect! This is the final design.
|
||||
```
|
||||
|
||||
## Example 4: Debugging Session
|
||||
|
||||
### Scenario
|
||||
Hunting down a tricky bug with multiple hypotheses.
|
||||
|
||||
### Workflow
|
||||
|
||||
```
|
||||
User: There's a memory leak in the application
|
||||
|
||||
Claude: Let me investigate...
|
||||
[Analyzes code]
|
||||
|
||||
User: /checkpoint save "Before debugging"
|
||||
|
||||
User: I think it's in the event listeners. Let's fix those.
|
||||
|
||||
Claude: [Fixes event listener cleanup]
|
||||
User: /checkpoint save "Event listener fix"
|
||||
User: Run memory profiler
|
||||
|
||||
Claude: Still leaking memory - event listeners weren't the issue
|
||||
|
||||
User: /checkpoint rewind "Before debugging"
|
||||
User: Maybe it's the database connections?
|
||||
|
||||
Claude: [Implements connection pooling fixes]
|
||||
User: /checkpoint save "Connection pooling fix"
|
||||
User: Run memory profiler
|
||||
|
||||
Claude: Still leaking - not the connections either
|
||||
|
||||
User: /checkpoint rewind "Before debugging"
|
||||
User: Let's check for circular references
|
||||
|
||||
Claude: [Finds and fixes circular references in cache]
|
||||
User: /checkpoint save "Circular reference fix"
|
||||
User: Run memory profiler
|
||||
|
||||
Claude: ✅ Memory leak fixed! The circular references in the caching layer were the culprit.
|
||||
|
||||
User: Excellent! Let's commit this fix.
|
||||
```
|
||||
|
||||
## Example 5: API Design Evolution
|
||||
|
||||
### Scenario
|
||||
Designing a REST API with multiple iterations.
|
||||
|
||||
### Workflow
|
||||
|
||||
```
|
||||
User: /checkpoint save "Before API design"
|
||||
|
||||
User: Create a REST API for our blog platform
|
||||
|
||||
Claude: [Creates basic CRUD API]
|
||||
User: /checkpoint save "Basic CRUD API"
|
||||
|
||||
User: This is too simple. Let's add pagination and filtering
|
||||
|
||||
Claude: [Adds pagination and filtering]
|
||||
User: /checkpoint save "API with pagination"
|
||||
|
||||
User: We need better resource relationships
|
||||
|
||||
Claude: [Implements HATEOAS links]
|
||||
User: /checkpoint save "API with HATEOAS"
|
||||
|
||||
User: Actually, let's try GraphQL instead of REST
|
||||
|
||||
Claude: /checkpoint rewind "Before API design"
|
||||
[Implements GraphQL API]
|
||||
User: /checkpoint save "GraphQL API"
|
||||
|
||||
User: /checkpoint compare "API with HATEOAS" "GraphQL API"
|
||||
|
||||
Claude: Comparison:
|
||||
|
||||
REST with HATEOAS:
|
||||
+ Simple, well-understood
|
||||
+ Easy to cache
|
||||
+ Works with existing tools
|
||||
- Multiple round trips
|
||||
- Over-fetching data
|
||||
|
||||
GraphQL:
|
||||
+ Single endpoint
|
||||
+ Client specifies data needs
|
||||
+ No over-fetching
|
||||
- More complex setup
|
||||
- Harder to cache
|
||||
- Steeper learning curve
|
||||
|
||||
User: For our use case, REST is better. Let's go with that.
|
||||
|
||||
Claude: /checkpoint rewind "API with HATEOAS"
|
||||
```
|
||||
|
||||
## Example 6: Configuration Management
|
||||
|
||||
### Scenario
|
||||
Testing different configuration approaches.
|
||||
|
||||
### Workflow
|
||||
|
||||
```
|
||||
User: /checkpoint save "Original config"
|
||||
|
||||
User: Move configuration to environment variables
|
||||
|
||||
Claude: [Implements env var configuration]
|
||||
User: /checkpoint save "Env var config"
|
||||
User: Test in development
|
||||
|
||||
Claude: Works locally but deployment issues in production
|
||||
|
||||
User: /checkpoint rewind "Original config"
|
||||
User: Try a config file approach with validation
|
||||
|
||||
Claude: [Implements YAML config with JSON schema validation]
|
||||
User: /checkpoint save "Config file with validation"
|
||||
User: Test in development
|
||||
|
||||
Claude: ✅ Works well, good validation errors
|
||||
|
||||
User: Can we also support env vars for sensitive values?
|
||||
|
||||
Claude: [Adds env var override for secrets]
|
||||
User: /checkpoint save "Hybrid config approach"
|
||||
User: Test deployment
|
||||
|
||||
Claude: ✅ All environments working correctly
|
||||
|
||||
User: Perfect! This is production-ready.
|
||||
```
|
||||
|
||||
## Example 7: Test Strategy
|
||||
|
||||
### Scenario
|
||||
Implementing comprehensive testing.
|
||||
|
||||
### Workflow
|
||||
|
||||
```
|
||||
User: /checkpoint save "Before adding tests"
|
||||
|
||||
User: Add unit tests for the auth module
|
||||
|
||||
Claude: [Adds Jest unit tests]
|
||||
User: /checkpoint save "Unit tests only"
|
||||
User: Run tests
|
||||
|
||||
Claude: 45 tests passing, 78% coverage
|
||||
|
||||
User: Add integration tests too
|
||||
|
||||
Claude: [Adds integration tests]
|
||||
User: /checkpoint save "Unit + Integration tests"
|
||||
User: Run tests
|
||||
|
||||
Claude: 89 tests passing, 92% coverage, but tests are slow (3 minutes)
|
||||
|
||||
User: The tests are too slow. Let's optimize.
|
||||
|
||||
Claude: [Optimizes test setup, adds parallel execution]
|
||||
User: /checkpoint save "Optimized tests"
|
||||
User: Run tests
|
||||
|
||||
Claude: 89 tests passing, 92% coverage, 35 seconds ✅
|
||||
|
||||
User: Great! Now add E2E tests for critical paths
|
||||
|
||||
Claude: [Adds Playwright E2E tests]
|
||||
User: /checkpoint save "Full test suite"
|
||||
User: Run all tests
|
||||
|
||||
Claude: 112 tests passing, 94% coverage, 2 minutes
|
||||
|
||||
User: Perfect balance of coverage and speed!
|
||||
```
|
||||
|
||||
## Key Takeaways
|
||||
|
||||
1. **Checkpoint before major changes**: Always create a checkpoint before significant modifications
|
||||
2. **Name checkpoints descriptively**: Use clear names that explain what was accomplished
|
||||
3. **Compare approaches**: Use checkpoint diff to evaluate different solutions
|
||||
4. **Don't fear experimentation**: Checkpoints make it safe to try radical changes
|
||||
5. **Clean up regularly**: Delete old checkpoints to keep things organized
|
||||
6. **Combine with git**: Use checkpoints for exploration, git for finalized work
|
||||
Reference in New Issue
Block a user