Claude Code desktop app: process exits with code 1 immediately on every message send

Bug Description

Claude Code in the desktop app (Claude.app) fails to respond to any messages. Every time a message is sent, the bundled Claude Code process exits with code 1 immediately (< 1 second), with no response.

Environment

• OS: macOS Darwin 24.6.0 (Sequoia)
• Claude Desktop App version: 1.1.7714
• Bundled Claude Code version: 2.1.78
• Installed CLI version: 2.1.81 (works fine from terminal)

Steps to Reproduce

1. Open Claude desktop app
2. Navigate to the Code mode (sidebarMode: code)
3. Type any message and press Enter
4. No response is returned

Error Logs (from ~/Library/Logs/Claude/main.log)

[info] [LocalPluginsReader] Found 1 local plugins
[info] [CCD] Using skills plugin at: .../skills-plugin/...
[info] [CCD] Passing 2 plugin(s) to SDK (skills: 1, local: 1)
[info] Using Claude Code binary at: .../claude-code/2.1.78/claude.app/Contents/MacOS/claude
[error] Session local_xxx query error: Claude Code process exited with code 1
[info] [CCD CycleHealth] unhealthy cycle (0s, hadFirstResponse=false, reason=no_response)

Additional Context

• The bundled Claude Code binary works correctly when launched from the terminal with --print and --input-format stream-json flags
• Deleting the cached bundle (~/Library/Application Support/Claude/claude-code/2.1.78/) and letting it re-download does NOT fix the issue
• Full reinstall of Claude.app does NOT fix the issue
• Clearing all app caches and data does NOT fix the issue
• The CLI (~/.local/bin/claude) works perfectly: claude --print "say hello" returns responses normally
• Authentication is valid (OAuth token present, API reachable)
• The issue appears to be specific to how the desktop app (Electron) launches the bundled Claude Code binary — something in the Electron launch environment causes the binary to exit with code 1, but I was unable to reproduce this from the terminal with any combination of flags

Workaround

None currently. The CLI works fine but the desktop Code mode is completely broken.