commit 21da2b4b5e2d526623a66167ce4e823e6447f95e
Author: Daniel Smolsky <dannysmo@gmail.com>
Date:   Sat Apr 4 02:58:46 2026 -0400

    Add oc-tps plugin

diff --git a/package.json b/package.json
new file mode 100644
index 0000000..24f8f3b
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "$schema": "https://json.schemastore.org/package.json",
+  "name": "oc-tps",
+  "version": "0.0.1",
+  "type": "module",
+  "exports": {
+    "./tui": {
+      "import": "./tui.tsx"
+    }
+  },
+  "engines": {
+    "opencode": ">=1.3.14"
+  },
+  "peerDependencies": {
+    "@opencode-ai/plugin": "*",
+    "@opentui/core": "*",
+    "@opentui/solid": "*",
+    "solid-js": "*"
+  }
+}
diff --git a/tui.tsx b/tui.tsx
new file mode 100644
index 0000000..3813299
--- /dev/null
+++ b/tui.tsx
@@ -0,0 +1,185 @@
+/** @jsxImportSource @opentui/solid */
+import type { TuiPlugin, TuiPluginModule } from "@opencode-ai/plugin/tui"
+import type { AssistantMessage } from "@opencode-ai/sdk/v2"
+import { createMemo, createSignal } from "solid-js"
+
+type StreamSample = {
+  at: number
+  tokens: number
+}
+
+const STREAM_WINDOW_MS = 15_000
+const ACTIVE_GAP_MS = 1_250
+const LIVE_STALE_MS = 1_500
+const SINGLE_SAMPLE_MS = 1_000
+const MAX_MESSAGE_SAMPLES = 4_096
+
+type TrackerState = {
+  streamSamplesBySession: Record<string, StreamSample[]>
+  messageSamples: Record<string, StreamSample[]>
+}
+
+function estimateStreamTokens(delta: string) {
+  return Math.max(1, Math.ceil(Buffer.byteLength(delta, "utf8") / 4))
+}
+
+function formatTps(value: number) {
+  if (!Number.isFinite(value) || value <= 0) return undefined
+  if (value >= 100) return `${Math.round(value)} TPS`
+  if (value >= 10) return `${value.toFixed(1)} TPS`
+  return `${value.toFixed(2)} TPS`
+}
+
+function activeDurationMs(samples: StreamSample[], tailAt?: number) {
+  if (samples.length === 0) return 0
+  if (samples.length === 1) {
+    const tailDuration = tailAt ? Math.max(0, tailAt - samples[0].at) : SINGLE_SAMPLE_MS
+    return Math.min(Math.max(tailDuration, 250), SINGLE_SAMPLE_MS)
+  }
+
+  let duration = 0
+  for (let i = 1; i < samples.length; i++) {
+    duration += Math.min(Math.max(0, samples[i].at - samples[i - 1].at), ACTIVE_GAP_MS)
+  }
+
+  if (tailAt) {
+    duration += Math.min(Math.max(0, tailAt - samples[samples.length - 1].at), ACTIVE_GAP_MS)
+  }
+
+  return Math.max(duration, SINGLE_SAMPLE_MS)
+}
+
+function SessionPromptRight(props: {
+  api: Parameters<TuiPlugin>[0]
+  sessionID: string
+  tracker: TrackerState
+  version: () => number
+  clock: () => number
+}) {
+  const sessionMessages = createMemo(() => props.api.state.session.messages(props.sessionID))
+
+  const finalTps = createMemo(() => {
+    props.version()
+    const last = sessionMessages().findLast(
+      (item): item is AssistantMessage => item.role === "assistant" && item.tokens.output > 0,
+    )
+    if (!last) return undefined
+
+    const user = sessionMessages().find((item) => item.role === "user" && item.id === last.parentID)
+    const start = user?.time.created ?? last.time.created
+    const end = last.time.completed ?? last.time.created
+    const sampleWindow = props.tracker.messageSamples[last.id] ?? []
+    const activeMs = activeDurationMs(sampleWindow)
+    const wallMs = end > start ? end - start : 0
+    const durationSeconds = (activeMs > 0 ? activeMs : wallMs) / 1000
+    if (durationSeconds <= 0) return undefined
+    return formatTps(last.tokens.output / durationSeconds)
+  })
+
+  const liveTps = createMemo(() => {
+    props.version()
+    props.clock()
+    const status = props.api.state.session.status(props.sessionID)
+    if (status?.type === "idle") return undefined
+    const samples = props.tracker.streamSamplesBySession[props.sessionID] ?? []
+    if (samples.length === 0) return undefined
+    const now = Date.now()
+    const relevant = samples.filter((sample) => now - sample.at <= STREAM_WINDOW_MS)
+    if (relevant.length === 0) return undefined
+    const lastSample = relevant[relevant.length - 1]
+    if (!lastSample || now - lastSample.at > LIVE_STALE_MS) return undefined
+    const total = relevant.reduce((sum, sample) => sum + sample.tokens, 0)
+    const durationSeconds = activeDurationMs(relevant, now) / 1000
+    if (durationSeconds <= 0) return undefined
+    return formatTps(total / durationSeconds)
+  })
+
+  const text = createMemo(() => {
+    const live = liveTps()
+    if (live) return `~${live}`
+    return finalTps()
+  })
+
+  return <>{text() ? <text fg={props.api.theme.current.textMuted}>{text()}</text> : null}</>
+}
+
+const tui: TuiPlugin = async (api) => {
+  const tracker: TrackerState = {
+    streamSamplesBySession: {},
+    messageSamples: {},
+  }
+  const [version, setVersion] = createSignal(0)
+  const [clock, setClock] = createSignal(Date.now())
+
+  const bump = () => setVersion((value) => value + 1)
+
+  const pruneSamples = (now = Date.now()) => {
+    let changed = false
+
+    for (const [sessionID, samples] of Object.entries(tracker.streamSamplesBySession)) {
+      const next = samples.filter((sample) => now - sample.at <= STREAM_WINDOW_MS)
+      if (next.length !== samples.length) {
+        changed = true
+        if (next.length > 0) tracker.streamSamplesBySession[sessionID] = next
+        else delete tracker.streamSamplesBySession[sessionID]
+      }
+    }
+
+    if (changed) bump()
+  }
+
+  const appendSample = (sessionID: string, messageID: string, sample: StreamSample) => {
+    const now = sample.at
+    tracker.streamSamplesBySession[sessionID] = [
+      ...(tracker.streamSamplesBySession[sessionID] ?? []).filter((item) => now - item.at <= STREAM_WINDOW_MS),
+      sample,
+    ]
+    tracker.messageSamples[messageID] = [...(tracker.messageSamples[messageID] ?? []), sample].slice(-MAX_MESSAGE_SAMPLES)
+    bump()
+  }
+
+  const onDelta = api.event.on("message.part.delta", (evt) => {
+    if (evt.properties.field !== "text") return
+    const parts = api.state.part(evt.properties.messageID)
+    const part = parts.find((item) => item.id === evt.properties.partID)
+    if (!part) return
+    if (part.type !== "text" && part.type !== "reasoning") return
+    appendSample(evt.properties.sessionID, evt.properties.messageID, {
+      at: Date.now(),
+      tokens: estimateStreamTokens(evt.properties.delta),
+    })
+  })
+
+  const onMessage = api.event.on("message.updated", (evt) => {
+    if (evt.properties.info.role !== "assistant") return
+    if (!evt.properties.info.time.completed) return
+    pruneSamples(evt.properties.info.time.completed)
+    bump()
+  })
+
+  const timer = setInterval(() => {
+    setClock(Date.now())
+    pruneSamples()
+  }, 1000)
+
+  api.lifecycle.onDispose(() => {
+    onDelta()
+    onMessage()
+    clearInterval(timer)
+  })
+
+  api.slots.register({
+    slots: {
+      session_prompt_right(_ctx, value) {
+        return <SessionPromptRight api={api} sessionID={value.session_id} tracker={tracker} version={version} clock={clock} />
+      },
+    },
+  })
+}
+
+const plugin: TuiPluginModule & { id: string } = {
+  id: "oc-tps",
+  tui,
+}
+
+export default plugin