# Claude Code v1.0.39

> Claude Code v1.0.39, released 1 Jul 2025 (2025-07-01). 13 entries read out of the shipped bundle. Unofficial, and not affiliated with Anthropic.

Web version: https://changelogs.core-directive.com/v/1.0.39

## Changes

# Claude Code v1.0.39 Changelog

### Activity Tracking System

- Added comprehensive activity tracking to monitor user and CLI operation timings
- New `cp` class tracks active operations and distinguishes between user activity and CLI activity
- Automatically records activity durations for analytics purposes
- 5-second timeout for user activity detection

### Checkpointing System

- **New checkpoint feature** for saving and restoring project states within git repositories
- Automatically creates shadow git repositories in `.claude/checkpoints/` for tracking changes
- Commands available (implementation details):
- Save checkpoints with custom labels
- Restore to previous checkpoints with automatic backup
- List all checkpoints in reverse chronological order
- Checkpoints are stored per git repository using SHA-256 hashing of the repository path

### Interactive Mode Detection

- Added functions to detect and manage interactive vs non-interactive sessions:
- `d91()` - Check if running in non-interactive mode
- `yBA()` - Check if running in interactive mode
- `kBA()` - Set interactive mode
- `xBA()` - Get client type
- `vBA()` - Set client type
- Client types supported: "cli", "github-action", "sdk-typescript", "sdk-cli"

### Model Support

- Enhanced model name display in `Cj()` function
- Now properly displays names for all Claude models:
- Opus 4
- Sonnet 4
- Sonnet 3.7
- Sonnet 3.5
- Haiku 3.5

### IDE Detection

- Added support for Android Studio in IDE detection
- JetBrains IDE list now includes "androidstudio"

### Command Detection

- Improved command availability checking with new `ih()` function
- Uses proper executable path resolution before checking file permissions

### Version Update

- Updated to version 0.55.1 (internal version tracking)
- Main version updated to 1.0.39

### New Dependencies

- Added several internal utility modules for HTTP handling, base64 encoding, and query string building
- New imports for crypto functions (`createHash`, `randomBytes`)
- Added `PassThrough` stream support

### Code Organization

- Refactored installer diagnostics (`YT5` function) with simplified logic
- Removed several unused functions:
- `ph` - Command availability checker (replaced by `ih`)
- `UA6` - IDE detection helper (replaced by `R06`)
- `Qw0` - String splitting function
- `z9A` - Shell configuration finder
- `wx2` - Version display formatter (replaced by `$v2`)
- `uO5` - Permission description helper (replaced by `dP5`)

### Session Management

- Enhanced `Kw0` class (formerly `lz0`) to support checkpoints
- Session logs now include checkpoint entries
- Added `getAllCheckpoints()` method to retrieve checkpoints for a session
- Modified log entry structure to handle checkpoint type

## Bug Fixes

- Fixed duplicate import statements
- Improved error handling in checkpoint operations
- Better process detection on macOS (returns null immediately instead of attempting detection)

## Usage Examples

While the checkpoint system is integrated into the codebase, it would typically be used through CLI commands (exact command syntax would depend on the CLI implementation):

`# Save a checkpoint with a custom label claude checkpoint save "Before major refactoring" # List all checkpoints claude checkpoint list # Restore to a previous checkpoint claude checkpoint restore <checkpoint-id>` The activity tracking and interactive mode detection work automatically in the background to provide better analytics and adapt behavior based on the execution context.