Beep On Idle

An opencode plugin that plays a short beep whenever any agent finishes its work and waits for the next input. Works for main sessions and subagents.

Requirements

• opencode with plugin support
• Linux with canberra-gtk-play (or set BEEP_CMD, see below)

Install

From npm, in your opencode.json / opencode.jsonc:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["opencode-beep-on-idle"]
}

Or from a local path:

{
  "plugin": ["/path/to/opencode-beep-on-idle/beep-on-idle.ts"]
}

Restart opencode after changing plugins — config is loaded once at startup.

Configuration

Env var	Default	Purpose
BEEP_CMD	/usr/bin/canberra-gtk-play -i bell	Shell command played on each idle event

Example: BEEP_CMD="paplay ~/sounds/done.oga".

How it works

The plugin subscribes to opencode's event bus and fires on session.status → idle and on session.idle. The sound is spawned detached and fire-and-forget: awaiting audio child processes can stall the plugin event loop (observed with proc.exited never resolving for paplay/canberra-gtk-play/pw-play when awaited), so the child is backgrounded (&, stdio detached) and never awaited.

Development

bun install
bun run build      # bundle check
bunx tsc --noEmit  # typecheck
bun run test       # smoke test (uses test/fake-beep.sh, no sound played)

Note: BEEP_CMD/BEEP_MARKER must be exported before bun starts (as the test script does) — Bun.spawn does not see process.env mutations made at runtime.

After an opencode upgrade, re-run the checks above plus one real listen-test (opencode run a trivial prompt), since the plugin API can shift between versions.

Changelog

1.0.1

• Fix: add main entry so opencode's npm plugin loader can resolve the entrypoint (without it the plugin was silently skipped).

1.0.0

• Initial release: beep on session.status idle and session.idle via detached canberra-gtk-play, BEEP_CMD override, smoke test.

License

MIT — see LICENSE.