[BUG] Claude Code Desktop v1.3561.0 - "process exited with code 1" on every tool request (macOS Apple Silicon)

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?

Desktop version: 1.3561.0
Claude Code CLI: 2.1.116
OS: macOS Apple Silicon
Plan: Pro

Bug: Every Claude Code request in the Desktop Code tab immediately returns
"Claude Code process exited with code 1" with no other output.

What works: Claude Code CLI in Terminal works perfectly.
What fails: 100% of requests in Desktop Code tab, since v1.2581.0 (April 14).

Already tried: Fresh reinstall, bypass permissions enabled, OAuth auth,
no API key conflicts, Full Disk Access granted, trustedDirectories configured.
MCP logs confirm server connects and lists tools — crash is silent at all log levels.

Console.app: No errors logged at crash time.
MCP logs: Server connects successfully, no tool calls reach MCP layer.

What Should Happen?

Claude Code requests in the Desktop Code tab should execute successfully and return results, the same way they do in Terminal.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Desktop v1.3561.0 on macOS Apple Silicon
2. Open the Code tab
3. Select any project folder
4. Enable "Bypass permissions mode" in Settings → Claude Code
5. Type any request (e.g. "Create a file called test.txt with the text hello")
6. Press Enter
7. Observe immediate red error: "Claude Code process exited with code 1"

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.3561.0

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_