"use client"; /** * @author: @kokonutui * @description: AI Agent Lanes * @version: 1.0.0 * @date: 2026-10-21 * @license: MIT * @website: https://kokonutui.com * @github: https://github.com/kokonut-labs/kokonutui */ import { Check, Pause, Play, RotateCcw } from "lucide-react"; import { AnimatePresence, motion, useReducedMotion } from "motion/react"; import { type CSSProperties, useEffect, useRef, useState } from "react"; import { cn } from "@/lib/utils"; export type ToolKind = "think" | "search" | "read" | "write"; export interface AgentStep { tool: ToolKind; label: string; /** Seconds from the start of the run. */ start: number; end: number; /** What came back, shown once the step is done. */ result?: string; } export interface AgentLane { id: string; name: string; steps: AgentStep[]; /** One line the sub-agent hands back to the lead. */ summary?: string; } export interface AIAgentLanesProps { task?: string; /** The first lane is the lead; the others are sub-agents it starts. */ lanes?: AgentLane[]; /** The lead's final answer, revealed as its last step runs. */ answer?: string; className?: string; } const EASE_OUT = [0.23, 1, 0.32, 1] as const; const LANE_H = 36; const TICK = 2; const DEMO_LANES: AgentLane[] = [ { id: "lead", name: "Lead", steps: [ { tool: "think", label: "Split the question", start: 0, end: 1.4, result: "Three parts: getting there, where to meet, and the weather.", }, { tool: "write", label: "Write the answer", start: 10.4, end: 13.6, }, ], }, { id: "flights", name: "Flights", summary: "Lisbon and Valencia have the most direct routes", steps: [ { tool: "search", label: "Direct flights from 11 offices", start: 1.6, end: 3.3, result: "142 routes across 6 cities", }, { tool: "read", label: "airline route maps", start: 3.3, end: 5.5, result: "Lisbon 10/11, Valencia 9/11, Porto 7/11", }, { tool: "think", label: "Rank by direct routes", start: 5.5, end: 6.8, }, ], }, { id: "venues", name: "Venues", summary: "3 venues under €90 a head", steps: [ { tool: "search", label: "Offsite venues for 30 people", start: 1.7, end: 2.9, result: "24 venues", }, { tool: "read", label: "Lisbon venue pages", start: 2.9, end: 4.5, result: "Palácio Chiado, LX Factory loft", }, { tool: "read", label: "Valencia venue pages", start: 4.5, end: 6.2, result: "Veles e Vents", }, { tool: "think", label: "Compare price per head", start: 6.2, end: 9.6, }, ], }, { id: "weather", name: "Weather", summary: "18–21°C and little rain in May", steps: [ { tool: "search", label: "Average May temperature", start: 1.8, end: 2.8, result: "6 cities", }, { tool: "read", label: "climate tables", start: 2.8, end: 4.6, result: "Lisbon 21°C, Valencia 22°C", }, { tool: "think", label: "Check rainy days", start: 4.6, end: 5.4, }, ], }, ]; const DEMO_ANSWER = "Go with Lisbon. Ten of your eleven offices fly there direct, Palácio Chiado fits 30 people at €84 a head, and late May averages 21°C with little rain. Valencia is a close second if you want the beach."; const TOOL_STYLE: Record = { think: "bg-[repeating-linear-gradient(135deg,rgb(113_113_122/0.35)_0_2px,transparent_2px_5px)] ring-1 ring-inset ring-zinc-400/50 dark:ring-zinc-500/50", search: "bg-teal-600 dark:bg-teal-500", read: "bg-stone-400 dark:bg-stone-500", write: "bg-zinc-900 dark:bg-zinc-100", }; const TOOL_NAME: Record = { think: "Thinking", search: "Search", read: "Read", write: "Write", }; const clamp01 = (n: number) => Math.min(1, Math.max(0, n)); const formatTime = (s: number) => `${s.toFixed(1)}s`; export default function AIAgentLanes({ task = "Where should our 30-person team meet for a May offsite?", lanes = DEMO_LANES, answer = DEMO_ANSWER, className, }: AIAgentLanesProps) { const reduceMotion = useReducedMotion(); const total = Math.max(...lanes.flatMap((l) => l.steps.map((s) => s.end))); const [now, setNow] = useState(0); const [playing, setPlaying] = useState(false); const [selected, setSelected] = useState(lanes[0]?.id ?? ""); const [hover, setHover] = useState<{ lane: number; step: number } | null>( null ); const nowRef = useRef(0); nowRef.current = now; // Start once on mount; reduced motion shows the finished run. useEffect(() => { if (reduceMotion) { setNow(total); return; } const id = setTimeout(() => setPlaying(true), 500); return () => clearTimeout(id); }, [reduceMotion, total]); useEffect(() => { if (!playing) { return; } let frame = 0; let last = performance.now(); const tick = (t: number) => { const next = Math.min(total, nowRef.current + (t - last) / 1000); last = t; setNow(next); if (next >= total) { setPlaying(false); return; } frame = requestAnimationFrame(tick); }; frame = requestAnimationFrame(tick); return () => cancelAnimationFrame(frame); }, [playing, total]); const done = now >= total; const lead = lanes[0]; const subs = lanes.slice(1); const running = subs.filter( (l) => now >= (l.steps[0]?.start ?? 0) && now < laneEnd(l) ).length; const x = (t: number) => `${(t / total) * 100}%`; const toggle = () => { if (done) { setNow(0); setPlaying(true); return; } setPlaying((p) => !p); }; return (

{statusLine(done, running, now, total)}

{task}

0 && now >= laneEnd(lane)} lane={lane} lead={i === 0} onSelect={() => setSelected(lane.id)} started={now >= (lane.steps[0]?.start ?? 0)} />

{lanes.map((lane, li) => (

{lane.steps.map((step, si) => ( setHover(on ? { lane: li, step: si } : null) } onSelect={() => setSelected(lane.id)} step={step} width={x(step.end - step.start)} /> ))}

))}

{ setPlaying(false); setNow(t); }} total={total} />

l.id === selected) ?? lead} lead={selected === lead.id} now={now} />

); } const laneEnd = (lane: AgentLane) => lane.steps.at(-1)?.end ?? 0; const statusLine = ( done: boolean, running: number, now: number, total: number ) => { if (done) { return `Done in ${formatTime(total)}`; } if (running > 0) { return `${running} ${running === 1 ? "agent" : "agents"} working · ${formatTime(now)}`; } return now === 0 ? "Ready" : `Lead agent · ${formatTime(now)}`; }; const playButtonLabel = (done: boolean, playing: boolean) => { if (done) { return "Replay run"; } return playing ? "Pause" : "Play"; }; function PlayIcon({ done, playing }: { done: boolean; playing: boolean }) { if (done) { return ; } return playing ? ( ) : ( ); } function LaneLabel({ lane, lead, active, started, finished, onSelect, }: { lane: AgentLane; lead: boolean; active: boolean; started: boolean; finished: boolean; onSelect: () => void; }) { return ( ); } function StepBar({ step, now, left, width, onHover, onSelect, }: { step: AgentStep; now: number; left: string; width: string; onHover: (on: boolean) => void; onSelect: () => void; }) { const progress = clamp01((now - step.start) / (step.end - step.start)); if (progress <= 0) { return null; } const style: CSSProperties = { left, width }; return ( ); } function StepTip({ step, now, top, total, }: { step: AgentStep; now: number; top: number; total: number; }) { const mid = (step.start + step.end) / 2 / total; const finished = now >= step.end; const anchor: CSSProperties = mid > 0.6 ? { right: `${(1 - step.end / total) * 100}%` } : { left: `${(step.start / total) * 100}%` }; return (

{TOOL_NAME[step.tool]} {formatTime(Math.min(now, step.end) - step.start)}

{step.label}

{step.result && (

{finished ? step.result : "Waiting for results…"}

)} ); } /** Lines from the lead out to each sub-agent, and back when they report. */ function Connectors({ lead, subs, now, total, }: { lead: AgentLane; subs: AgentLane[]; now: number; total: number; }) { const ref = useRef(null); const [width, setWidth] = useState(0); useEffect(() => { const el = ref.current; if (!el) { return; } const observer = new ResizeObserver(() => setWidth(el.clientWidth)); observer.observe(el); setWidth(el.clientWidth); return () => observer.disconnect(); }, []); const fork = lead.steps[0]?.end ?? 0; const join = lead.steps.at(-1)?.start ?? total; const xAt = (t: number) => (t / total) * width; const yAt = (lane: number) => lane * LANE_H + LANE_H / 2; const reach = (from: number, to: number) => clamp01((now - from) / (to - from)); const top = yAt(0); const fx = xAt(fork); const jx = xAt(join); return ( ); } function Scrubber({ now, total, onScrub, }: { now: number; total: number; onScrub: (t: number) => void; }) { const ticks = Array.from( { length: Math.floor(total / TICK) + 1 }, (_, i) => i * TICK ); return (

{ticks.map((t) => ( {t}s ))}

); } function Legend() { return (

{TOOL_NAME[tool]}

); } function Transcript({ lane, lead, now, answer, }: { lane: AgentLane; lead: boolean; now: number; answer: string; }) { const steps = lane.steps.filter((s) => now >= s.start); const writing = lead ? lane.steps.at(-1) : undefined; const written = writing && now >= writing.start ? answer.slice( 0, Math.round( answer.length * clamp01((now - writing.start) / (writing.end - writing.start)) ) ) : ""; return (

{lane.name} {lane.summary && now >= laneEnd(lane) && ( {" "} · {lane.summary} )}

{written ? (

{written} {now < (writing?.end ?? 0) && ( )}

) : (

Not started yet
{TOOL_NAME[step.tool]} {step.label} {finished && step.result && ( {" "} → {step.result} )}

)}

); }

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