Claude Prune — Development skill for Claude Code

claude-prune

A fast CLI tool for pruning Claude Code sessions.

Features

• 🎯 Smart Pruning: Keep messages since the last N assistant responses
• 🛡️ Safe by Default: Always preserves session summaries and metadata
• 💾 Auto Backup: Creates timestamped backups before modifying files

Installation

Run directly (recommended)

# Using npx (Node.js)
npx claude-prune  --keep 50

# Using bunx (Bun)
bunx claude-prune  --keep 50

Install globally

# Using npm
npm install -g claude-prune

# Using bun
bun install -g claude-prune

Usage

claude-prune  --keep  [--dry-run]

Arguments

• sessionId: UUID of the Claude Code session (without .jsonl extension)

Options

• -k, --keep : Number of assistant messages to keep (required)
• --dry-run: Preview changes without modifying files
• -h, --help: Show help information
• -V, --version: Show version number

Examples

# Keep the last 10 assistant messages and everything since then
claude-prune abc123-def456-789 --keep 10

# Preview what would be pruned (safe mode)
claude-prune abc123-def456-789 --keep 5 --dry-run

# Minimal pruning - keep only the last assistant message
claude-prune abc123-def456-789 --keep 1

How It Works

1. Locates Session File: Finds ~/.claude/projects/{project-path}/{sessionId}.jsonl
2. Preserves Critical Data: Always keeps the first line (session summary/metadata)
3. Smart Pruning: Finds the Nth-to-last assistant message and keeps everything from that point forward
4. Preserves Context: Keeps all non-message lines (tool results, system messages)
5. Safe Backup: Creates {sessionId}.bak.{timestamp} before modifying
6. Interactive Confirmation: Asks for confirmation unless using --dry-run

File Structure

Claude Code stores sessions in:

~/.claude/projects/{project-path-with-hyphens}/{sessionId}.jsonl

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