[BUG] Ctrl+Z suspend stopped working in 2.1.0

[mbinde]

Description

Ctrl+Z no longer suspends Claude Code as of version 2.1.0. The process remains in the foreground instead of suspending.

Steps to Reproduce

1. Launch Claude Code 2.1.0+
2. Press Ctrl+Z
3. Process remains in foreground (expected: suspend and return to shell)

Environment

• OS: macOS (Darwin 25.0.0)
• Terminal: iTerm2
• Claude Code version: 2.1.0, 2.1.1, 2.1.2, 2.1.3 (all affected)
• Last working version: 2.0.9

Additional Context

• Ctrl+Z works correctly in other applications (e.g., emacs) in the same terminal session
• Terminal stty settings are correct (susp = ^Z)
• This is a regression from the fix implemented for issue Make Claude Code better behaved w.r.t. job control signals (including SIGTSTP) #588

[github-actions]

Found 3 possible duplicate issues:

1. [BUG] Ctrl-Z (SIGTSTP) no longer backgrounds Claude Code in 2.1.1 (confirmed in iTerm2 and Ghostty) #16727
2. [BUG] Ctrl+Z suspend not working (macOS iTerm2) #17045
3. [Bug] Ctrl+Z suspend functionality broken in v2.1.0+ #16895

This issue will be automatically closed as a duplicate in 3 days.

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🤖 Generated with Claude Code

[github-actions]

This issue has been automatically closed as a duplicate of #16727.

If this is incorrect, please re-open this issue or create a new one.

🤖 Generated with Claude Code

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.