[BUG] Claude Desktop force-quits within seconds of opening the Code tab (CPU ~120%, no crash log) — macOS, regression after 2026-06-18 update

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Opening the in-app Code tab makes Claude Desktop hang and then force-quit within a few seconds. Chat and Cowork tabs work fine.

During the hang, the Claude process alone pins CPU at ~120% (single process; the renderer/GPU process also spikes), while the system has plenty of free RAM (~9 GB free of 24 GB, memory pressure green) — so this is NOT system OOM.

No macOS crash report is produced (empty Crashpad dumps, no .ips), consistent with a hang / forced kill rather than a clean crash. Started immediately after updating on 2026-06-18; the day before was fine.

The standalone Claude Code CLI (claude in Terminal) does NOT crash, so the fault is the in-app Code tab / renderer, not the CLI.

What Should Happen?

Opening the Code tab should load normally without pinning CPU/GPU or force-quitting the app.

Error Messages/Logs

No crash report (.ips) generated; Crashpad dump folder empty.
App log line: "Claude Code process terminated by signal SIGKILL"
Intermittent around the same time: "API Error: The socket connection was closed unexpectedly" and CycleHealth "unhealthy".

Steps to Reproduce

1. Open Claude Desktop (Chat / Cowork load fine).
2. Click the Code tab.
3. Within a few seconds CPU jumps to ~120% (Claude process), the app hangs, then force-quits.
4. Reproducible every time.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

the build prior to the 2026-06-18 update

Claude Code Version

⏺ Bash(claude --version) ⎿  2.1.181 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

• Claude Desktop version: [Claude 메뉴 → About]
• Machine: Mac, 24 GB RAM
• Workaround: running the Claude Code CLI in a standalone Terminal (claude) never crashes.
• Tried, did NOT help: open -a Claude --args --disable-gpu / Cmd+Q + Force Quit + relaunch / Mac reboot. (Other users report Clear Cache + Reset App Data also don't help — see #66901.)
• Cowork sandbox VM (4 GB) churns/rebuilds on launch; device temp climbed ~44→56°C during the spike.
• Feature request: please add a "disable hardware acceleration" toggle in settings — there is none currently.
• Likely duplicate of / related to: #66901, #51153, #49055.Cause I am Korean, I am not very proficient in English and coding. I used Claude (co-work) on the report. If there is an issue with the report, please add a comment. Thank You.