OpenCode Token Speed Plugin

A OpenCode TUI plugin that displays real-time LLM output token speed (tok/s) in the session prompt area.

Features

• Real-time speed display — Shows output token speed during streaming using a 2-second sliding window.
• Persistent display — When streaming ends, the last measured speed is kept visible.
• Non-intrusive — Uses the session_prompt_right slot (append mode), so it doesn't replace any built-in UI.

Setup

Add the plugin to your tui.json (not opencode.json):

{
  "plugin": ["opencode-token-speed-plugin"]
}

That's it. OpenCode will automatically install the plugin on next run.

Note: This is a TUI plugin, so it must be configured in ~/.config/opencode/tui.json, not opencode.json.

How it works

• Listens to message.part.delta events to count characters as they stream in.
• Estimates tokens using the chars / 4 heuristic within a 2-second sliding window.
• Displays ▲ XX.X tok/s to the right of the session prompt.

License

MIT