Claude Code Session /History

See every change Claude made in a single diff — no git required, no digging through local history.

When Claude Code edits your files across a session, it can be hard to get a clear picture of everything that changed. Local history is scattered, and you may not be using git (or don't want to clutter it with work-in-progress commits). This tool gives you a complete before-and-after view of all files Claude touched in any session, opened directly in PyCharm's diff viewer.

How It Works

1. A Hook (hook_snapshot.py) runs automatically before every Write/Edit operation Claude performs. It silently saves a copy of each file's original state to ~/.claude/session-snapshots/.
2. A GUI (review_gui.py) lists all your recent sessions, allowing you to select one and see what changed there.

Installation

This will set up the hook and add the skill to Claude.

Linux / macOS:

./setup.sh

Windows:

setup.bat

• Safe to re-run if not sure...
• Restart Claude Code after running it.

Usage

From Claude Code's terminal, run:

/history

This opens the session diff reviewer GUI. From there:

• Filter sessions by keyword (searches summaries, prompts, and project names)
• Sort by clicking any column header
• Double-click a session (highlighted in green if it has snapshots) to launch PyCharm's diff view

Or run:

/last

To immediately open the last session for this project.

Requirements

• Python 3
• PyCharm (must be available on PATH as pycharm or pycharm-professional)
• Claude Code

Platform Support

Windows, Linux, Mac and Cheese (Mac not tested... Should work, but I don't have a Mac... But you know what they say! Users are the best testers...)

How Snapshots Work

• Only the first version of each file is saved per session (the true "before" state)
• Snapshots are stored under ~/.claude/session-snapshots/{session_id}/files/
• Old snapshots are automatically cleaned up after 7 days
• The hook is designed to never interfere with Claude — if anything goes wrong, it fails silently

Disclaimer

Use at your own discretion! It is simply a placeholder until Anthropic come to their senses and add "/history" into claude code...