opencode-timings

A tiny OpenCode TUI sidebar plugin that shows per-session timing — how much wall-clock the session has taken and how much of that was actually spent waiting on the model.

It renders into the same right-hand sidebar as the Quota / MCP / LSP / Todo / Files panels, reading the session's messages directly from the TUI's reactive state. Nothing is ever injected into the message stream, so there is zero context-window pollution.

Timing
api/wall ██████░░ 78%
api 31s · wall 40s
turns 4 · avg 8s
slowest 19s
per-turn ▄█▂▂

Every row names itself, so there are no unlabeled numbers or glyphs to decode.

Metrics

Row	Meaning
api/wall	How much of wall-clock was actual model inference, as a bar gauge and percent.
api	Total assistant inference time — the sum of time.completed − time.created over every completed assistant message.
wall	Span from the first to the last message timestamp. Includes the time you spend reading/typing between turns, so api is always a fraction of it.
turns	Number of completed assistant messages, plus the average per-turn duration.
slowest	The single slowest assistant message.
per-turn	Sparkline of each recent turn's duration.

The panel is always shown; before the first turn its values read zero.

Install

Add it to the plugin array of the TUI config that OpenCode loads (~/.config/opencode/tui.json or tui.jsonc) — this is a TUI plugin, so it belongs in tui.json, not opencode.json:

{
  "$schema": "https://opencode.ai/tui.json",
  "plugin": ["@foae/opencode-timings@latest"]
}

OpenCode installs the plugin and its dependencies with Bun at startup. Restart OpenCode and open the session sidebar to see the Timing panel.

You can also pin a version, e.g. @foae/opencode-timings@0.1.2.

Configuration

Pass options using the tuple form ([spec, options]) in tui.json:

{
  "$schema": "https://opencode.ai/tui.json",
  "plugin": [
    ["@foae/opencode-timings@latest", {
      "mode": "fancy",
      "fields": { "ratio": true, "api": true, "wall": true, "turns": true, "avg": true, "slow": true, "sparkline": true }
    }]
  ]
}

Option	Values	Default	Meaning
mode	"fancy" | "simple"	"fancy"	fancy draws the gauge bar on the api/wall row and adds the per-turn sparkline; simple is the same rows without the bar or sparkline.
fields	object of booleans	all true	Each toggles exactly one value: ratio (the api/wall gauge + percent), api, wall, turns, avg, slow, sparkline (sparkline is fancy-only). Values that share a line drop out individually.

With no options (a plain "@foae/opencode-timings@latest" string), it defaults to fancy mode with all fields shown.

Requirements

• OpenCode 1.15.x or newer (uses the TUI slot plugin API).

Development

Built and run with Bun. The package ships raw source — there is no build step; OpenCode loads src/tui.tsx directly.

• src/timing.ts — pure timing math, formatting, and config parsing (no JSX), unit-tested.
• src/tui.tsx — the SolidJS sidebar component and the slot registration.

bun install
bun run typecheck   # tsc --noEmit
bun test            # unit tests for the pure logic in src/timing.ts

opentui, solid-js, and the OpenCode plugin/SDK are peer dependencies — at runtime they come from the OpenCode host so the plugin shares its renderer; the devDependencies mirror them for local typecheck and tests.

License

MIT — see LICENSE.