opencode-subagent-watch

OpenCode TUI plugin for monitoring subagent activity.

The built-in view is fine for short-lived subagents. When several run at once, it is easy to lose track of them. This plugin adds a sidebar panel that keeps recent subagents visible at a glance.

Example states:

* busy · Locate authentication flow
  grep 8s ago                     dur 2m
  explore
~ retry · Fix flaky tests
  dur 40s
  builder
! error · Review patch
  dur 43s · $0.03
  reviewer
- idle · Map API routes
  $0.63
  general · openrouter/deepseek-v3.2

Tested with OpenCode 1.18.9.

Why create this slop?

I'm on the verge of switching to the Pi harness, but don't want to rebuild what OpenCode already provides right now.

Why would I install this over a bajillion other vibe-coded plugins out there?

This plugin is minimal in all aspects, and I will keep it that way.

$ du -sh dist/
 36K    dist/

Also, no dependencies, ever.

Install

Install:

opencode plugin --global opencode-subagent-watch@0.3.1

Upgrade:

opencode plugin --global --force opencode-subagent-watch@0.3.1

Restart OpenCode after installation or upgrade.

Local development

Requires:

• Bun
• OpenCode

Install dependencies and build:

bun install
bun run build

Test the built plugin from either OpenCode config scope:

• Global config: ~/.config/opencode/tui.jsonc.
• Project config: tui.json in the project root.

Append the absolute path to the plugin array:

{
  "plugin": ["/absolute/path/to/opencode-subagent-watch/dist/tui.js"]
}

OpenCode loads TUI plugins at startup. Rebuild and restart after each source change:

bun run build

Checks

• bun run precommit: format, lint, typecheck, and test.
• bun run check: check formatting, lint, typecheck, test, build, and package.

Preview all sidebar states with the local demo provider:

bun run demo

Run /demo command, it will spawn deterministic subagents.

For plugin load diagnostics:

opencode --print-logs --log-level DEBUG

Disclaimer

This project is provided as-is, without warranty or guarantee of compatibility, reliability, or continued maintenance. It is not affiliated with or endorsed by OpenCode.

The initial code was generated with GPT-5.6 Sol.

License

MIT