[BUG] Claude CLI v2.1.119 crashes with SIGTERM (exit -15) after ~10.5h background running with Telegram plugin on macOS

Which version of the Claude CLI are you using?

v2.1.119

Which version string did you use?

v2.1.119

What command were you running?

cd /Users/halu_1/Desktop && claude --channels plugin:telegram@claude-plugins-official --dangerously-skip-permissions --permission-mode auto

This is run as a long-lived background service that continuously monitors Telegram for incoming messages.

What happened?

The Claude CLI process is killed with SIGTERM (exit code -15) after approximately 10.5 hours of continuous background running. The process is not terminated gracefully — it receives a SIGTERM signal from an external source.

What did you expect to happen?

The Claude CLI process should persist indefinitely as a background Telegram monitoring service without being killed by an external SIGTERM signal.

Steps to reproduce

1. Start Claude CLI with the Telegram plugin as a background process:

``bash
cd /Users/halu_1/Desktop && claude --channels plugin:telegram@claude-plugins-official --dangerously-skip-permissions --permission-mode auto
``

1. Let the process run in the background monitoring for Telegram messages.
2. After approximately 10.5 hours, observe that the process exits with code -15 (SIGTERM).

Logs / diagnostics

exit code: -15 (SIGTERM)

The crash appears to be triggered by macOS power management or launchd killing long-lived TTY-detached processes. The --permission-mode auto flag bypasses the Trust Prompt but does not prevent the SIGTERM from being delivered.

Related issues (not duplicates)

• #39876 — Telegram plugin session competition (different: about session conflicts, not process termination)
• #38092 — bun server.ts CPU spike (different: about CPU spikes, not SIGTERM)
• #36800 — duplicate plugin instances (different: about duplicate spawns, not crashes)
• #36411 — inbound notifications not delivered (different: about notification delivery)

None of the above describe the SIGTERM background crash scenario.

Environment

• OS: macOS (Apple Silicon)
• CLI version: v2.1.119
• Plugin: Telegram (plugin:telegram@claude-plugins-official)
• Flags: --dangerously-skip-permissions --permission-mode auto

Additional notes

This may be related to macOS power management aggressively terminating long-running processes that are detached from a TTY session. It would be helpful if Claude CLI could:

1. Auto-reconnect or respawn after unexpected SIGTERM
2. Provide better logging around signal handlers and termination events
3. Include guidance on how to run as a persistent background service (e.g., via launchd or systemsettings)

The --permission-mode auto flag is required for unattended operation but does not help prevent the process from being killed.