[Bug] claude process CPU spikes 50-100% when idle (regression in 2.1.108)

Description

Starting with version 2.1.108, the claude process repeatedly spikes to
50–100% CPU even when idle between API calls. This does not occur in 2.1.104.

Environment

• Claude Code: 2.1.108 (regression), 2.1.104 (working)
• OS: Ubuntu 24.04 (GCP e2-standard-2, 2 vCPU / 8GB RAM)
• Shell: zsh, running inside tmux
• Invocation: claude --dangerously-skip-permissions

Symptoms

• claude process repeatedly spikes to 50–100% CPU as measured in htop, even when idle or waiting for API responses
• Multiple Claude Code instances in tmux panes compound the problem, causing system-wide resource exhaustion in an environment that previously worked fine with multiple claude instances running in parallel

Steps to Reproduce

1. Install Claude Code 2.1.108
2. Run claude --dangerously-skip-permissions in a tmux session
3. Observe CPU usage in htop — process spikes to 50–100% CPU even while

waiting for user input or API responses

Workaround

Downgrading to 2.1.104 resolves the issue:

~/.local/bin/claude install 2.1.104