ESC and Ctrl+C fail to interrupt during active tool calls

Description

ESC and Ctrl+C do not reliably interrupt Claude Code when tool calls are actively running. The user has to resort to killing the terminal or using pkill -f "claude" from another terminal.

Steps to Reproduce

1. Start Claude Code session
2. Run multiple parallel tool calls (e.g., SSH commands to remote systems)
3. Press ESC or Ctrl+C to interrupt
4. Observe that nothing happens or there is significant delay

Expected Behavior

• ESC should immediately abort the current operation
• Ctrl+C should immediately interrupt and return to prompt

Actual Behavior

• ESC does not respond or requires multiple presses
• Ctrl+C is ignored while tool calls are running
• Only way to stop is killing the terminal or pkill -f "claude"

Environment

• Claude Code CLI
• macOS (Darwin 25.2.0)
• Multiple parallel Bash/SSH tool calls

Impact

This breaks the user's ability to control the session, forcing terminal kills which lose context.

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Reported via Claude Code