[Bug]: Ctrl+C can skip exit prompt and terminate CLI immediately

[llamantino]

Is there an existing issue for the same bug? (If one exists, thumbs up or comment on the issue instead).

• I have checked the existing issues.

Describe the bug and reproduction steps

The CLI currently doesn't handle Ctrl+C properly in some states. Pressing it can cause the CLI to exit immediately without showing the expected exit prompt.

In the CLI, Ctrl+C is currently handled in three different ways:

• By the message input prompt (when active)
• By the agent pause listener (active only when the agent is in the running state)
• In all other cases, a fallback signal handler is triggered, which causes the CLI to exit without confirmation

This fallback behavior can cause the CLI to terminate unexpectedly if Ctrl+C is pressed at the wrong time - for example, right after submitting a message but before the agent has started working.

Reproduction steps

1. Start the CLI
2. Type a message and press Enter
3. Press Ctrl+C immediately after submitting the message (before "Agent is running" appears)
4. The CLI exits without showing the exit prompt (with a Session was interrupted: interrupted message)

OpenHands Installation

CLI

OpenHands Version

0.48

Model Name

No response

Operating System

None

Logs, Errors, Screenshots, and Additional Context

No response