{ "$schema": "https://ui.shadcn.com/schema/registry-item.json", "name": "agent-session", "type": "registry:ui", "title": "Agent Session", "description": "A coding agent at work in its terminal, beside the app it's changing. The prompt types itself, each command runs with a live timer and lands its output in one burst, and every line that writes a file shows up in the app a beat later, ringed. Point at a change on either side and its other half lights up.", "author": "KeyframeUI ", "categories": [ "ai", "code", "developer" ], "docs": "Live preview, examples and props: https://keyframeui.com/components/agent-session", "dependencies": [ "motion", "clsx", "tailwind-merge" ], "registryDependencies": [ "utils" ], "files": [ { "path": "components/ui/agent-session.tsx", "type": "registry:ui", "content": "\"use client\";\n\nimport * as React from \"react\";\nimport { animate, motion, useInView, useReducedMotion } from \"motion/react\";\n\nimport { cn } from \"@/lib/utils\";\n\n/**\n * Keep:\n * - The session is one plan built ahead by `buildPlan` and played on a ms clock, one `setTimeout` to\n * the next event at a time; the screen is a function of `t`, so the clock stops and resumes cleanly.\n * - A jump (Skip, Replay, a new script or `speed`) sets `jumped`, so everything lands in place\n * without animating; typing jitter comes from `noise`, so every replay types the same.\n * - Cause, reload, effect: a line with an `effect` lands, the address bar sweeps, and its target\n * changes `hmr` ms later.\n * - Lines, prompts and targets animate `transform` and `opacity` only (plus the pop's blur), and\n * both target looks set every property, so switching to reduced motion leaves no blur behind.\n * - Reduced motion still plays the session a step at a time, text whole and changes fading; the\n * animated panes are `aria-hidden` and `` gives screen readers the script as text.\n */\nconst TIMING = {\n /** Playback rate, as a multiple of the default pace (the `speed` prop). */\n speed: 1,\n // The script's pace at the default speed; `speed` divides these.\n /** Between coming into view and the first keystroke, in ms. */\n boot: 500,\n /** Per typed character, in ms. */\n key: 34,\n /** Variation per keystroke, in ms; deterministic. */\n jitter: 26,\n /** Extra after a comma or full stop, in ms. */\n comma: 90,\n /** A finished prompt (or shell command) waiting before it's sent, in ms. */\n send: 380,\n /** Between a prompt landing and the agent's first move, in ms. */\n think: 560,\n /** How long a command runs when its step gives no `ms`, in ms. */\n run: 900,\n /** Between output lines landing, in ms. */\n line: 26,\n /** Cap on one burst's whole stagger, in ms. */\n spread: 320,\n /** Per word of a reply, in ms. */\n word: 22,\n /** Between steps, in ms. */\n gap: 420,\n /** Between a line writing a file and the app showing it, in ms. The reload sweep starts there. */\n hmr: 140,\n /** Between steps when reduced motion plays it step by step, in ms. */\n stepped: 650,\n // Not divided by `speed`.\n /** Between clock readings, so spinners and timers move between keystrokes, in ms. */\n tick: 100,\n /** Per frame of the spinner, in ms of the session clock. */\n spinner: 80,\n /** A finished session waiting before `loop` restarts it, in ms. */\n hold: 4000,\n /** A line or prompt landing in the transcript, in seconds. */\n rise: { duration: 0.2, ease: [0.22, 1, 0.36, 1] },\n /** Reduced motion: lines and changes appear, in seconds. */\n fade: { duration: 0.2, ease: \"easeOut\" },\n /** A change landing in the app (the target's `duration` and `bounce` props). */\n pop: { type: \"spring\", visualDuration: 0.42, bounce: 0.22 },\n /** The placeholder making way, in seconds. */\n leave: { duration: 0.14, ease: \"easeOut\" },\n /** The landing ring and line glow fading out, in seconds. */\n flash: { duration: 0.9, ease: [0.22, 1, 0.36, 1] },\n /** The address bar's reload sweep, in seconds. */\n sweep: { duration: 0.42, ease: [0.22, 1, 0.36, 1] },\n /** The sweep's fade, in seconds, held until 60% of the way. */\n sweepFade: { duration: 0.6, times: [0, 0.6, 1] },\n /** Hover highlight on and off, in seconds. */\n link: { duration: 0.15, ease: \"easeOut\" },\n /** The transcript following new lines, or scrolling to a pointed-at line. */\n scroll: { type: \"spring\", visualDuration: 0.3, bounce: 0 },\n /** One blink of a running command's dot, in seconds. */\n blink: { duration: 0.9, ease: \"easeInOut\" },\n /** The dot going solid when its command finishes, in seconds. */\n dot: { duration: 0.15 },\n /** One blink of the caret, in seconds: on for the first half, off for the second. */\n caret: { duration: 1.05, times: [0, 0.5, 0.5, 1], ease: \"linear\" },\n} as const;\n\n/* ─────────────────────────────────────────────────────────\n * AGENT SESSION STORYBOARD\n *\n * rest a terminal beside the app it is about to change:\n * an empty transcript over the input box, and the\n * app in its before state\n * view a third of it in view, then 0.5s: the prompt types\n * itself into the input box, 34ms a key with a\n * little human jitter and a pause after commas\n * send 0.38s after the last key the input clears and the\n * prompt rises 8px into the transcript\n * run a command line appears with a blinking dot and a\n * live timer under it; when it finishes the dot\n * turns green (red if it failed) and the output\n * lands in one burst, 26ms a line, capped at 0.32s\n * land a line that writes a file glows in the accent, the\n * preview's address bar runs a reload sweep, and\n * 140ms later the change pops into the app (a 0.42s\n * spring with a little give) inside a ring that\n * fades over 0.9s. Cause, reload, effect\n * reply the agent's answer streams in a word at a time\n * done the status line reads \"Worked for 9s · 3 commands\"\n * and the title bar offers Replay\n * link point at a change in the app and the line that made\n * it lights up (scrolled into view if needed); point\n * at that line and the change is ringed\n * again Replay, a new `script`, or `loop` start from the\n * top with the app back in its before state\n * sleep off screen or in a hidden tab the clock stops and\n * resumes where it was\n * keys Skip lands everything at once, Replay starts over;\n * screen readers get the whole transcript as text\n * reduced the session still plays, a step at a time: each\n * prompt, command and reply appears whole, a beat\n * apart, and changes fade in without a pop or rise\n * ───────────────────────────────────────────────────────── */\n\nconst OFFSET = {\n lift: 8, // px a sent prompt rises\n drop: 6, // px an output line rises\n} as const;\n\nconst SPINNER = \"⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏\";\n\n/* ── Script ─────────────────────────────────────────────── */\n\nexport type AgentSessionTone = \"default\" | \"muted\" | \"added\" | \"removed\" | \"success\" | \"error\";\n\n/** One line of output: plain text, or text with a tone and the change it makes in the preview. */\nexport type AgentSessionLine = string | { text: string; tone?: AgentSessionTone; effect?: string };\n\nexport type AgentSessionStep =\n /** You, typing to the agent. Types into the input box, then moves into the transcript. */\n | { prompt: string }\n /** The agent running a tool. `tool` defaults to \"Bash\", `ms` is how long it runs, `pace` spaces its output lines. */\n | {\n run: string;\n tool?: string;\n output?: AgentSessionLine[];\n more?: number;\n ms?: number;\n pace?: number;\n failed?: boolean;\n }\n /** The agent's reply, streamed a word at a time. `effect` lands when it finishes. */\n | { say: string; effect?: string }\n /** A command you type at a `$` prompt yourself, for plain CLI sessions. */\n | { shell: string; output?: AgentSessionLine[]; more?: number; ms?: number; pace?: number; failed?: boolean };\n\ntype PlanLine = { text: string; tone: AgentSessionTone; effect?: string; at: number };\n\ntype PlanStep =\n | { kind: \"prompt\"; text: string; keys: number[]; sent: number }\n | {\n kind: \"run\";\n shell: boolean;\n tool: string;\n command: string;\n keys: number[];\n called: number;\n done: number;\n lines: PlanLine[];\n more?: { count: number; at: number };\n failed: boolean;\n }\n | { kind: \"say\"; parts: string[]; at: number[]; start: number };\n\ninterface Plan {\n steps: PlanStep[];\n /** Every moment the picture changes, sorted. */\n events: number[];\n /** When each change lands in the preview. */\n effects: Map;\n total: number;\n /** The first prompt's send, where the \"Worked for\" clock starts. */\n begun: number;\n commands: number;\n agent: boolean;\n}\n\n// Same jitter on the server, the client and every replay.\nconst noise = (i: number) => {\n const x = Math.sin(i * 12.9898 + 78.233) * 43758.5453;\n return x - Math.floor(x);\n};\n\nfunction lineOf(line: AgentSessionLine): Omit {\n return typeof line === \"string\" ? { text: line, tone: \"default\" } : { tone: \"default\", ...line };\n}\n\nfunction buildPlan(script: AgentSessionStep[], speed: number, stepped: boolean): Plan {\n const k = 1 / Math.max(0.1, speed);\n const steps: PlanStep[] = [];\n const marks: number[] = [0];\n const effects = new Map();\n let begun = -1;\n let commands = 0;\n let t = TIMING.boot * k;\n\n const land = (effect: string | undefined, at: number) => {\n if (!effect) return;\n const time = at + TIMING.hmr * k;\n if (!effects.has(effect) || effects.get(effect)! > time) effects.set(effect, time);\n marks.push(time);\n };\n\n const type = (text: string) => {\n const keys: number[] = [];\n for (let i = 0; i < text.length; i++) {\n if (!stepped) {\n const ch = text[i - 1];\n t += (TIMING.key + (noise(i) - 0.5) * TIMING.jitter + (ch === \",\" || ch === \".\" ? TIMING.comma : 0)) * k;\n }\n keys.push(t);\n }\n marks.push(...keys);\n return keys;\n };\n\n for (const step of script) {\n if (\"prompt\" in step) {\n const keys = type(step.prompt);\n const sent = t + (stepped ? TIMING.stepped / 2 : TIMING.send) * k;\n if (begun < 0) begun = sent;\n steps.push({ kind: \"prompt\", text: step.prompt, keys, sent });\n marks.push(sent);\n t = sent + (stepped ? TIMING.stepped : TIMING.think) * k;\n } else if (\"run\" in step || \"shell\" in step) {\n const shell = \"shell\" in step;\n const command = shell ? step.shell : step.run;\n const keys = shell ? type(command) : [];\n const called = t + (shell ? (stepped ? TIMING.stepped / 2 : TIMING.send) : 0) * k;\n const done = called + (stepped ? Math.min(step.ms ?? TIMING.run, TIMING.stepped) : (step.ms ?? TIMING.run)) * k;\n const raw = (step.output ?? []).map(lineOf);\n // One quick burst by default; `pace` writes them one at a time, like files landing.\n const gap = stepped ? 0 : (step.pace ?? Math.min(TIMING.line, TIMING.spread / Math.max(1, raw.length))) * k;\n const lines = raw.map((line, i) => ({ ...line, at: done + i * gap }));\n lines.forEach((line) => land(line.effect, line.at));\n const more = step.more ? { count: step.more, at: done + raw.length * gap } : undefined;\n commands++;\n steps.push({\n kind: \"run\",\n shell,\n tool: shell ? \"\" : (\"tool\" in step && step.tool) || \"Bash\",\n command,\n keys,\n called,\n done,\n lines,\n more,\n failed: !!step.failed,\n });\n marks.push(called, done, ...lines.map((line) => line.at), more?.at ?? done);\n t = (more?.at ?? lines.at(-1)?.at ?? done) + (stepped ? TIMING.stepped : TIMING.gap) * k;\n } else {\n const parts = step.say.match(/\\S+\\s*/g) ?? [step.say];\n const start = t;\n const at = parts.map((_, i) => (stepped ? start : start + i * TIMING.word * k));\n steps.push({ kind: \"say\", parts, at, start });\n marks.push(...at);\n land(step.effect, at.at(-1) ?? start);\n t = (at.at(-1) ?? start) + (stepped ? TIMING.stepped : TIMING.gap) * k;\n }\n }\n\n const total = Math.max(0, ...marks) + 1;\n // Clock readings, so spinners and timers move between keystrokes.\n for (let tick = 0; tick < total; tick += TIMING.tick) marks.push(tick);\n marks.push(total);\n const events = [...new Set(marks.map((m) => Math.round(m)))].sort((a, b) => a - b);\n\n return {\n steps,\n events,\n effects,\n total: events.at(-1) ?? 0,\n begun: Math.max(0, begun),\n commands,\n agent: script.some((step) => \"prompt\" in step || \"say\" in step || \"run\" in step),\n };\n}\n\nfunction nextEvent(events: number[], t: number) {\n let lo = 0;\n let hi = events.length;\n while (lo < hi) {\n const mid = (lo + hi) >> 1;\n if (events[mid] <= t) lo = mid + 1;\n else hi = mid;\n }\n return events[lo] ?? Infinity;\n}\n\n/* ── Store ──────────────────────────────────────────────── */\n\ntype State = {\n /** Session clock, in ms. */\n t: number;\n /** The clock got here by a jump (Skip, Replay, a new script), so nothing animates on the way. */\n jumped: boolean;\n /** The change being pointed at, in either pane. */\n hover: string | null;\n /** Bumped on every restart, so a run completes once. */\n run: number;\n};\n\nfunction createStore() {\n let state: State = { t: 0, jumped: true, hover: null, run: 0 };\n const listeners = new Set<() => void>();\n const emit = () => listeners.forEach((listener) => listener());\n return {\n get: () => state,\n seek(t: number, jumped: boolean) {\n if (state.t === t && state.jumped === jumped) return;\n state = { ...state, t, jumped };\n emit();\n },\n restart() {\n state = { ...state, t: 0, jumped: true, run: state.run + 1 };\n emit();\n },\n point(hover: string | null) {\n if (state.hover === hover) return;\n state = { ...state, hover };\n emit();\n },\n subscribe(listener: () => void) {\n listeners.add(listener);\n return () => {\n listeners.delete(listener);\n };\n },\n };\n}\n\ntype Store = ReturnType;\n\nconst SessionContext = React.createContext<{\n store: Store;\n effects: Map;\n reduced: boolean;\n} | null>(null);\n\nfunction useSession(part: string) {\n const session = React.useContext(SessionContext);\n if (!session) throw new Error(`${part} must be used inside .`);\n return session;\n}\n\nfunction useLanded(effect: string) {\n const { store, effects } = useSession(\"useAgentSessionEffect\");\n const at = effects.get(effect) ?? Infinity;\n return React.useSyncExternalStore(\n store.subscribe,\n () => store.get().t >= at,\n () => false,\n );\n}\n\n/**\n * True once the line with this `effect` has landed in the current run. For previews that change\n * in their own way, like a bar that fills or a number that counts up.\n */\nexport function useAgentSessionEffect(effect: string) {\n return useLanded(effect);\n}\n\nconst subscribeNever = () => () => {};\n\nfunction usePageVisible() {\n return React.useSyncExternalStore(\n (onChange) => {\n document.addEventListener(\"visibilitychange\", onChange);\n return () => document.removeEventListener(\"visibilitychange\", onChange);\n },\n () => document.visibilityState === \"visible\",\n () => true,\n );\n}\n\n/* ── Look ───────────────────────────────────────────────── */\n\nconst THEMES = {\n dark: {\n window: \"bg-zinc-950 text-zinc-300 ring-white/10 shadow-[0_24px_48px_-28px_rgb(0_0_0/0.55)]\",\n bar: \"border-white/[0.07]\",\n title: \"text-zinc-400\",\n strong: \"text-zinc-50\",\n muted: \"text-zinc-500\",\n band: \"bg-white/[0.06]\",\n input: \"border-white/10 bg-white/[0.03]\",\n button: \"text-zinc-400 hover:bg-white/[0.08] hover:text-zinc-100 focus-visible:ring-white/30\",\n lights: [\"bg-[#ff5f57]\", \"bg-[#febc2e]\", \"bg-[#28c840]\"],\n tones: {\n default: \"text-zinc-300\",\n muted: \"text-zinc-500\",\n added: \"text-emerald-300\",\n removed: \"text-rose-300\",\n success: \"text-emerald-400\",\n error: \"text-rose-400\",\n },\n dot: { idle: \"bg-zinc-500\", ok: \"bg-emerald-400\", failed: \"bg-rose-400\", say: \"bg-zinc-100\" },\n },\n auto: {\n window:\n \"bg-white text-zinc-700 ring-zinc-950/10 shadow-[0_24px_48px_-32px_rgb(0_0_0/0.3)] dark:bg-zinc-950 dark:text-zinc-300 dark:ring-white/10\",\n bar: \"border-zinc-950/[0.07] dark:border-white/[0.07]\",\n title: \"text-zinc-500 dark:text-zinc-400\",\n strong: \"text-zinc-950 dark:text-zinc-50\",\n muted: \"text-zinc-400 dark:text-zinc-500\",\n band: \"bg-zinc-950/[0.04] dark:bg-white/[0.06]\",\n input: \"border-zinc-950/10 bg-zinc-950/[0.02] dark:border-white/10 dark:bg-white/[0.03]\",\n button:\n \"text-zinc-500 hover:bg-zinc-950/[0.06] hover:text-zinc-900 focus-visible:ring-zinc-400 dark:text-zinc-400 dark:hover:bg-white/[0.08] dark:hover:text-zinc-100 dark:focus-visible:ring-white/30\",\n lights: [\"bg-zinc-200 dark:bg-zinc-700\", \"bg-zinc-200 dark:bg-zinc-700\", \"bg-zinc-200 dark:bg-zinc-700\"],\n tones: {\n default: \"text-zinc-700 dark:text-zinc-300\",\n muted: \"text-zinc-400 dark:text-zinc-500\",\n added: \"text-emerald-700 dark:text-emerald-300\",\n removed: \"text-rose-600 dark:text-rose-300\",\n success: \"text-emerald-600 dark:text-emerald-400\",\n error: \"text-rose-600 dark:text-rose-400\",\n },\n dot: {\n idle: \"bg-zinc-400 dark:bg-zinc-500\",\n ok: \"bg-emerald-500 dark:bg-emerald-400\",\n failed: \"bg-rose-500 dark:bg-rose-400\",\n say: \"bg-zinc-900 dark:bg-zinc-100\",\n },\n },\n} as const;\n\ntype Theme = (typeof THEMES)[keyof typeof THEMES];\n\nconst ACCENT = \"var(--agent-session-accent)\";\n\n/* ── AgentSession ───────────────────────────────────────── */\n\nexport interface AgentSessionProps extends Omit, \"children\"> {\n /** What happens, in order: prompts you type, commands the agent runs with their output, its replies, and shell commands. */\n script: AgentSessionStep[];\n /** The app being changed, shown in a browser window beside the terminal. Wrap the parts that change in `AgentSessionTarget`. Leave it out for a terminal on its own. */\n children?: React.ReactNode;\n /** Text in the terminal's title bar. */\n title?: string;\n /** Address shown in the preview window's bar. */\n url?: string;\n /** Start by itself once a third of it is in view. Off, it waits for the Play button. */\n autoPlay?: boolean;\n /** Stop the clock where it is. Off screen and in hidden tabs it stops by itself. */\n paused?: boolean;\n /** Play again from the top, after a 4s pause, forever or this many more times. */\n loop?: boolean | number;\n /** Playback rate. 2 plays twice as fast. */\n speed?: number;\n /** \"dark\" is a dark terminal in both color schemes; \"auto\" is light in light mode and dark in dark mode. */\n theme?: \"dark\" | \"auto\";\n /** Placeholder in the input box before anything is typed. */\n placeholder?: string;\n /** Called when a run finishes. */\n onComplete?: () => void;\n /** Called with the effect's name each time a change lands in the preview. */\n onEffect?: (effect: string) => void;\n}\n\n/**\n * A coding agent in its terminal beside the app it's changing. Lines that write files land in the\n * preview as they print, and pointing at either half lights up the other.\n */\nexport function AgentSession({\n script,\n children,\n title = \"agent\",\n url = \"localhost:3000\",\n autoPlay = true,\n paused = false,\n loop = false,\n speed = TIMING.speed,\n theme = \"dark\",\n placeholder = \"Ask the agent to change something\",\n onComplete,\n onEffect,\n className,\n style,\n ...props\n}: AgentSessionProps) {\n // useReducedMotion is already true in the hydration render, so reduced markup waits for hydration.\n const hydrated = React.useSyncExternalStore(subscribeNever, () => true, () => false);\n const reduced = !!useReducedMotion() && hydrated;\n const plan = React.useMemo(() => buildPlan(script, speed, reduced), [script, speed, reduced]);\n const [store] = React.useState(createStore);\n const state = React.useSyncExternalStore(store.subscribe, store.get, store.get);\n\n const rootRef = React.useRef(null);\n const seen = useInView(rootRef, { once: true, amount: 0.33 });\n const inView = useInView(rootRef, { amount: 0.05 });\n const visible = usePageVisible();\n const [pressedPlay, setPressedPlay] = React.useState(false);\n const started = autoPlay ? seen || pressedPlay : pressedPlay;\n const running = started && inView && visible && !paused;\n\n // Callbacks change every render; the clock shouldn't restart for that.\n const handlers = React.useRef({ onComplete, onEffect });\n React.useEffect(() => {\n handlers.current = { onComplete, onEffect };\n });\n\n // A new script (or speed) starts over with the app in its before state.\n const firstPlan = React.useRef(true);\n React.useEffect(() => {\n if (firstPlan.current) {\n firstPlan.current = false;\n return;\n }\n store.restart();\n }, [plan, store]);\n\n const loops = React.useRef(0);\n const completed = React.useRef(-1);\n React.useEffect(() => {\n if (!running) return;\n let timer = 0;\n const advance = () => {\n const { t, run } = store.get();\n if (t >= plan.total) {\n if (completed.current !== run) {\n completed.current = run;\n handlers.current.onComplete?.();\n }\n const more = loop === true || (typeof loop === \"number\" && loops.current < loop);\n if (more) {\n // The restart bumps `run`, which starts this effect over from the top.\n timer = window.setTimeout(() => {\n loops.current++;\n store.restart();\n }, TIMING.hold);\n }\n return;\n }\n const next = nextEvent(plan.events, t);\n timer = window.setTimeout(() => {\n store.seek(next, false);\n for (const [effect, at] of plan.effects) {\n if (at > t && at <= next) handlers.current.onEffect?.(effect);\n }\n advance();\n }, next - t);\n };\n advance();\n return () => window.clearTimeout(timer);\n }, [running, plan, store, loop, state.run]);\n\n const done = state.t >= plan.total;\n const skip = () => store.seek(plan.total, true);\n const replay = () => {\n loops.current = 0;\n store.restart();\n setPressedPlay(true);\n };\n\n const look = THEMES[theme];\n const context = React.useMemo(() => ({ store, effects: plan.effects, reduced }), [store, plan.effects, reduced]);\n const control = !started ? \"play\" : done ? \"replay\" : \"skip\";\n\n return (\n \n \n \n (control === \"skip\" ? skip() : control === \"replay\" ? replay() : setPressedPlay(true))}\n store={store}\n reduced={reduced}\n />\n {children != null && (\n \n {children}\n \n )}\n \n \n \n \n );\n}\n\n/* ── Terminal ───────────────────────────────────────────── */\n// The animated transcript is hidden from screen readers; reads the same script as text.\n\nfunction Terminal({\n plan,\n state,\n look,\n title,\n placeholder,\n control,\n onControl,\n store,\n reduced,\n}: {\n plan: Plan;\n state: State;\n look: Theme;\n title: string;\n placeholder: string;\n control: \"play\" | \"skip\" | \"replay\";\n onControl: () => void;\n store: Store;\n reduced: boolean;\n}) {\n const { t, jumped, hover } = state;\n const instant = jumped;\n const scrollRef = React.useRef(null);\n const stick = React.useRef(true);\n const auto = React.useRef | null>(null);\n\n // Follow new lines to the bottom unless the reader scrolled up to look at something.\n React.useLayoutEffect(() => {\n const el = scrollRef.current;\n if (!el || !stick.current) return;\n const target = el.scrollHeight - el.clientHeight;\n if (Math.abs(el.scrollTop - target) < 1) return;\n auto.current?.stop();\n if (instant || reduced) {\n el.scrollTop = target;\n return;\n }\n auto.current = animate(el.scrollTop, target, {\n ...TIMING.scroll,\n onUpdate: (v) => (el.scrollTop = v),\n onComplete: () => (auto.current = null),\n });\n }, [t, instant, reduced]);\n\n React.useEffect(() => {\n const el = scrollRef.current;\n if (!el) return;\n const onIntent = () => auto.current?.stop();\n const onScroll = () => {\n if (auto.current) return;\n stick.current = el.scrollHeight - el.clientHeight - el.scrollTop < 24;\n };\n el.addEventListener(\"wheel\", onIntent, { passive: true });\n el.addEventListener(\"touchstart\", onIntent, { passive: true });\n el.addEventListener(\"scroll\", onScroll, { passive: true });\n return () => {\n el.removeEventListener(\"wheel\", onIntent);\n el.removeEventListener(\"touchstart\", onIntent);\n el.removeEventListener(\"scroll\", onScroll);\n };\n }, []);\n\n // Pointing at a change in the app brings the line that made it into view.\n React.useEffect(() => {\n const el = scrollRef.current;\n if (!el || !hover) return;\n const line = el.querySelector(`[data-effect=\"${CSS.escape(hover)}\"]`);\n if (!line) return;\n const box = el.getBoundingClientRect();\n const rect = line.getBoundingClientRect();\n if (rect.top >= box.top && rect.bottom <= box.bottom) return;\n const top = rect.top - box.top + el.scrollTop;\n auto.current?.stop();\n stick.current = false;\n const target = Math.max(0, Math.min(top - el.clientHeight / 2, el.scrollHeight - el.clientHeight));\n if (reduced) el.scrollTop = target;\n else\n auto.current = animate(el.scrollTop, target, {\n ...TIMING.scroll,\n onUpdate: (v) => (el.scrollTop = v),\n onComplete: () => (auto.current = null),\n });\n }, [hover, reduced]);\n\n const spinner = SPINNER[Math.floor(t / TIMING.spinner) % SPINNER.length];\n const typing = plan.steps.find(\n (step): step is Extract =>\n step.kind === \"prompt\" && step.keys.length > 0 && t >= step.keys[0] && t < step.sent,\n );\n const active = plan.steps.find(\n (step): step is Extract => step.kind === \"run\" && t >= step.called && t < step.done,\n );\n const done = t >= plan.total;\n const begun = t >= plan.begun && plan.steps.some((step) => step.kind === \"prompt\");\n\n const enter = (rise: number) =>\n instant\n ? false\n : reduced\n ? { opacity: 0 }\n : { opacity: 0, transform: `translateY(${rise}px)` };\n\n return (\n \n
\n
\n {look.lights.map((light, i) => (\n \n ))}\n
\n

\n {title}\n

\n \n \n {control === \"play\" ? \"Play\" : control === \"skip\" ? \"Skip\" : \"Replay\"}\n \n
\n\n \n
\n {plan.steps.map((step, i) => {\n if (step.kind === \"prompt\") {\n if (t < step.sent) return null;\n return (\n \n >\n {step.text}\n \n );\n }\n\n if (step.kind === \"run\") {\n const startAt = step.shell ? (step.keys[0] ?? step.called) : step.called;\n if (t < startAt) return null;\n const typed = step.shell ? step.command.slice(0, step.keys.filter((key) => key <= t).length) : step.command;\n const isTyping = step.shell && t < step.called;\n const isRunning = t >= step.called && t < step.done;\n const status = t < step.done ? \"idle\" : step.failed ? \"failed\" : \"ok\";\n const lines = step.lines.filter((line) => line.at <= t);\n return (\n
\n \n {step.shell ? (\n $\n ) : (\n \n )}\n \n {step.shell ? (\n {typed}\n ) : (\n <>\n {step.tool}\n (\n {step.command}\n )\n \n )}\n {isTyping && }\n \n \n\n {isRunning && (\n
\n {reduced ? \"…\" : spinner}\n \n Running {((t - step.called) / 1000).toFixed(1)}s\n \n
\n )}\n\n {(lines.length > 0 || (step.more && t >= step.more.at)) && (\n
\n {lines.map((line, j) => (\n line.effect && store.point(on ? line.effect : null)}\n />\n ))}\n {step.more && t >= step.more.at && (\n \n … +{step.more.count} lines\n \n )}\n
\n )}\n
\n );\n }\n\n const shown = step.at.filter((at) => at <= t).length;\n if (shown === 0) return null;\n return (\n
\n \n

\n {step.parts.slice(0, shown).join(\"\")}\n

\n
\n );\n })}\n
\n \n\n {plan.agent && (\n
\n \n >\n {typing ? (\n \n {typing.text.slice(0, typing.keys.filter((key) => key <= t).length)}\n \n \n ) : (\n \n {!begun && }\n {!begun && {placeholder}}\n \n )}\n
\n

\n {done && begun ? (\n <>\n \n \n Worked for {Math.max(1, Math.round((plan.total - plan.begun) / 1000))}s · {plan.commands}{\" \"}\n {plan.commands === 1 ? \"command\" : \"commands\"}\n \n \n ) : begun ? (\n <>\n {reduced ? \"…\" : spinner}\n \n {active ? `Running ${active.tool}` : \"Thinking\"} · {Math.floor((t - plan.begun) / 1000)}s\n \n \n ) : null}\n

\n \n )}\n \n );\n}\n\nfunction OutputLine({\n line,\n first,\n look,\n enter,\n instant,\n reduced,\n linked,\n onPoint,\n}: {\n line: PlanLine;\n first: boolean;\n look: Theme;\n enter: false | { opacity: number; transform?: string };\n instant: boolean;\n reduced: boolean;\n linked: boolean;\n onPoint: (on: boolean) => void;\n}) {\n return (\n <>\n {first ? \"⎿\" : \"\"}\n e.pointerType === \"mouse\" && onPoint(true)}\n onPointerLeave={(e) => e.pointerType === \"mouse\" && onPoint(false)}\n className={cn(\"relative -mx-1.5 min-w-0 rounded px-1.5\", look.tones[line.tone])}\n >\n {line.effect && (\n <>\n {/* The glow it lands with, then the highlight while its change is pointed at. */}\n \n \n \n )}\n {line.text}\n \n \n );\n}\n\nfunction StatusDot({ className, blink = false }: { className: string; blink?: boolean }) {\n return (\n \n );\n}\n\nfunction Caret({ solid = false }: { solid?: boolean }) {\n return (\n \n );\n}\n\nfunction ControlIcon({ control }: { control: \"play\" | \"skip\" | \"replay\" }) {\n return (\n \n {control === \"play\" ? (\n \n ) : control === \"skip\" ? (\n \n ) : (\n \n )}\n \n );\n}\n\nfunction Check() {\n return (\n \n \n \n );\n}\n\n/* ── Preview ────────────────────────────────────────────── */\n// A browser window around the app. Each landing runs a reload sweep across its address bar.\n\nfunction Preview({\n url,\n plan,\n t,\n jumped,\n reduced,\n children,\n}: {\n url: string;\n plan: Plan;\n t: number;\n jumped: boolean;\n reduced: boolean;\n children: React.ReactNode;\n}) {\n // The latest file write, which kicks off a reload `hmr` ms before its change shows.\n let reload = -1;\n for (const at of plan.effects.values()) {\n const start = at - TIMING.hmr;\n if (start <= t && start > reload) reload = start;\n }\n\n return (\n
\n
\n
\n \n \n \n
\n \n {url}\n \n {reload >= 0 && !jumped && !reduced && (\n \n )}\n
\n
{children}
\n
\n );\n}\n\n/* ── AgentSessionTarget ─────────────────────────────────── */\n\nexport interface AgentSessionTargetProps extends Omit, \"children\"> {\n /** The name a script line gives in its `effect`. The target changes when that line lands. */\n effect: string;\n /** Shown until the change lands, like a placeholder icon or the old label. Without it the target waits invisible, keeping its space. */\n fallback?: React.ReactNode;\n /** The changed content. A function gets `landed` for previews that change in their own way. */\n children: React.ReactNode | ((landed: boolean) => React.ReactNode);\n /** How the content arrives: a springy pop, a plain fade, or no motion of its own (the ring still flashes). */\n enter?: \"pop\" | \"fade\" | \"none\";\n /** How long the pop takes to land, in seconds. Only for `enter=\"pop\"`. */\n duration?: number;\n /** How much the pop overshoots and settles, from 0 (none) up. Only for `enter=\"pop\"`. */\n bounce?: number;\n}\n\n/**\n * A part of the preview that a script line changes. Swaps `fallback` for its children when the line\n * lands, with a ring around it, and links to that line on hover.\n */\nexport function AgentSessionTarget({\n effect,\n fallback,\n children,\n enter = \"pop\",\n duration = TIMING.pop.visualDuration,\n bounce = TIMING.pop.bounce,\n className,\n onPointerEnter,\n onPointerLeave,\n ...props\n}: AgentSessionTargetProps) {\n const { store, reduced } = useSession(\"\");\n const landed = useLanded(effect);\n const linked = React.useSyncExternalStore(\n store.subscribe,\n () => store.get().hover === effect,\n () => false,\n );\n // A landing by Skip, Replay or a new script doesn't animate.\n const instant = React.useSyncExternalStore(\n store.subscribe,\n () => store.get().jumped,\n () => true,\n );\n\n const motionOf = enter === \"none\" ? null : enter === \"fade\" || reduced ? \"fade\" : \"pop\";\n // Both looks set every property, so switching to reduced motion after hydration leaves no blur behind.\n const hidden =\n motionOf === \"pop\"\n ? { opacity: 0, transform: \"scale(0.9)\", filter: \"blur(4px)\" }\n : { opacity: 0, transform: \"scale(1)\", filter: \"blur(0px)\" };\n const shown = { opacity: 1, transform: \"scale(1)\", filter: \"blur(0px)\" };\n\n return (\n *]:[grid-area:1/1]\", className)}\n onPointerEnter={(e) => {\n if (e.pointerType === \"mouse\" && landed) store.point(effect);\n onPointerEnter?.(e);\n }}\n onPointerLeave={(e) => {\n if (e.pointerType === \"mouse\") store.point(null);\n onPointerLeave?.(e);\n }}\n {...props}\n >\n {fallback != null && (\n \n {fallback}\n \n )}\n {motionOf == null ? (\n
{typeof children === \"function\" ? children(landed) : children}
\n ) : (\n \n {typeof children === \"function\" ? children(landed) : children}\n \n )}\n {landed && (\n \n )}\n \n \n );\n}\n\n/* ── Transcript ─────────────────────────────────────────── */\n// The whole session as text for screen readers, with a polite note when a run finishes.\n\nfunction Transcript({ script, done }: { script: AgentSessionStep[]; done: boolean }) {\n const text = (line: AgentSessionLine) => (typeof line === \"string\" ? line : line.text);\n const reply = [...script].reverse().find((step): step is { say: string } => \"say\" in step);\n return (\n
\n
    \n {script.map((step, i) => (\n
  1. \n {\"prompt\" in step\n ? `You: ${step.prompt}`\n : \"say\" in step\n ? `Agent: ${step.say}`\n : \"run\" in step\n ? `Ran ${step.tool ?? \"Bash\"}: ${step.run}. ${(step.output ?? []).map(text).join(\". \")}`\n : `$ ${step.shell}. ${(step.output ?? []).map(text).join(\". \")}`}\n
    2. \n ))}\n
\n

{done ? `Session finished.${reply ? ` ${reply.say}` : \"\"}` : \"\"}

\n
\n );\n}\n" } ] }