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The panel opens while streaming and closes when done. */ streaming?: boolean; /** Known reasoning duration in ms. Measured client-side when omitted. */ durationMs?: number | undefined; defaultOpen?: boolean; open?: boolean | undefined; onOpenChange?: ((open: boolean) => void) | undefined; /** Where images in the reasoning may load from: host names, `'self'` or `'*'`. See `MarkdownProps.allowedImageHosts`. */ allowedImageHosts?: readonly string[] | undefined; } /** * Collapsible model reasoning. Opens automatically while the model thinks and * collapses to a one-line "Thought for 3.2s" summary when it finishes, unless * the user has toggled it. */ export function Reasoning({ text, streaming = false, durationMs, defaultOpen, open: openProp, onOpenChange, allowedImageHosts, className, ...props }: ReasoningProps) { const [openState, setOpenState] = useState(defaultOpen ?? streaming); const [touched, setTouched] = useState(false); const [prevStreaming, setPrevStreaming] = useState(streaming); // Follow the stream (adjusting state during render, not in an effect). if (prevStreaming !== streaming) { setPrevStreaming(streaming); if (!touched) setOpenState(streaming); } const open = openProp ?? openState; const activity = useActivityWindow(streaming); const measured = activity.startedAt !== undefined && activity.endedAt !== undefined ? activity.endedAt - activity.startedAt : undefined; const duration = durationMs ?? measured; const label = streaming ? 'Thinking' : duration !== undefined ? `Thought for ${formatDuration(duration)}` : 'Reasoning'; return ( { setTouched(true); if (openProp === undefined) setOpenState(next); onOpenChange?.(next); }} className={cn('font-aui-sans', className)} {...props} > {label}

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Always false on AI SDK 6. */ export function isAutomaticApproval(approval: object | undefined): boolean { return (approval as ApprovalExtras)?.isAutomatic === true; } /** The reason the tool gave for asking (AI SDK 7's `requestReason`), if any. */ export function getApprovalRequestReason(approval: object | undefined): string | undefined { const reason = (approval as ApprovalExtras)?.requestReason; return typeof reason === 'string' ? reason : undefined; } export type { ChatStatus, UIMessage }; /** Any part of any `UIMessage`. */ export type AnyUIPart = UIMessage['parts'][number]; /** A static (`tool-${name}`) or dynamic tool part. */ export type ToolPart = ToolUIPart | DynamicToolUIPart; /** The AI SDK v7 tool part states. */ export type ToolState = ToolPart['state']; export type SourcePart = SourceUrlUIPart | SourceDocumentUIPart; export type { ReasoningUIPart, SourceDocumentUIPart, SourceUrlUIPart, TextUIPart }; /** Token usage, compatible with the AI SDK `LanguageModelUsage` shape. */ export type RunUsage = { inputTokens?: number | undefined; outputTokens?: number | undefined; totalTokens?: number | undefined; inputTokenDetails?: Partial | undefined; outputTokenDetails?: Partial | undefined; }; export const TOOL_STATES = [ 'input-streaming', 'input-available', 'approval-requested', 'approval-responded', 'output-available', 'output-error', 'output-denied', ] as const satisfies readonly ToolState[]; export function isToolPart(part: { type: string }): part is ToolPart { return part.type === 'dynamic-tool' || part.type.startsWith('tool-'); } export function isSourcePart(part: { type: string }): part is SourcePart { return part.type === 'source-url' || part.type === 'source-document'; } /** Same semantics as the SDK's `getToolName`, without the runtime import. */ export function getToolPartName(part: ToolPart): string { return part.type === 'dynamic-tool' ? part.toolName : part.type.slice('tool-'.length); } /** * A UI-level phase derived from the SDK tool state. Several SDK states collapse * into one visual phase (e.g. an approved call that has not returned yet is "running"). */ export type ToolPhase = 'streaming' | 'running' | 'awaiting-approval' | 'success' | 'error' | 'denied'; export function getToolPhase( part: Pick & { approval?: { approved?: boolean; isAutomatic?: boolean } | undefined; preliminary?: boolean | undefined; }, ): ToolPhase { switch (part.state) { case 'input-streaming': return 'streaming'; case 'input-available': return 'running'; case 'approval-requested': // A policy decision (`isAutomatic`) streams as a request immediately followed by its response. return part.approval?.isAutomatic ? 'running' : 'awaiting-approval'; case 'approval-responded': return part.approval?.approved ? 'running' : 'denied'; case 'output-available': return part.preliminary ? 'running' : 'success'; case 'output-error': return 'error'; case 'output-denied': return 'denied'; } } export const TOOL_PHASE_LABEL: Record = { streaming: 'Preparing', running: 'Running', 'awaiting-approval': 'Needs approval', success: 'Done', error: 'Failed', denied: 'Denied', }; export function isSettledPhase(phase: ToolPhase): boolean { return phase === 'success' || phase === 'error' || phase === 'denied'; } export function getToolParts(parts: readonly AnyUIPart[]): ToolPart[] { return parts.filter(isToolPart); } export type ApprovalStatus = 'pending' | 'approved' | 'denied'; /** The approval state of a tool part, or `undefined` for parts outside the approval flow. */ export function getApprovalStatus(part: ToolPart): ApprovalStatus | undefined { if (!part.approval) return undefined; if (part.state === 'approval-requested') return 'pending'; if (part.state === 'output-denied') return 'denied'; return part.approval.approved ? 'approved' : part.approval.approved === false ? 'denied' : 'pending'; } export interface ToolTiming { /** First time the call was observed (input started streaming). */ startedAt?: number | undefined; /** When execution began: input complete, or approval granted. */ runningAt?: number | undefined; /** When the call settled (output, error or denial). */ endedAt?: number | undefined; } export type ToolTimings = Readonly>; /** Pure reducer behind `useToolTimings`, exported for tests and custom stores. */ export function observeToolTimings(prev: ToolTimings, tools: readonly ToolPart[], now: number): ToolTimings { let next: Record | undefined; const write = (id: string, value: ToolTiming) => { next ??= { ...prev }; next[id] = value; }; for (const tool of tools) { const phase = getToolPhase(tool); const current = (next ?? prev)[tool.toolCallId]; if (!current) { if (isSettledPhase(phase)) write(tool.toolCallId, {}); else write(tool.toolCallId, { startedAt: now, runningAt: phase === 'running' ? now : undefined }); continue; } if (current.startedAt === undefined || current.endedAt !== undefined) continue; if (phase === 'running' && current.runningAt === undefined) write(tool.toolCallId, { ...current, runningAt: now }); else if (isSettledPhase(phase)) write(tool.toolCallId, { ...current, runningAt: current.runningAt ?? now, endedAt: now }); } return next ?? prev; } /** Collect sources, de-duplicated by URL (or source id for documents). */ export function getSourceParts(parts: readonly AnyUIPart[]): SourcePart[] { const seen = new Set(); const out: SourcePart[] = []; for (const part of parts) { if (!isSourcePart(part)) continue; const key = part.type === 'source-url' ? part.url : `doc:${part.sourceId}`; if (seen.has(key)) continue; seen.add(key); out.push(part); } return out; } /** A source in app-level shape. AI SDK `source-url` / `source-document` parts are accepted too. */ export interface SourceItem { id: string; url?: string | undefined; title?: string | undefined; /** Optional snippet shown in the cards variant. */ description?: string | undefined; /** For documents. */ filename?: string | undefined; mediaType?: string | undefined; } export function toSourceItem(source: SourcePart | SourceItem): SourceItem { if ('type' in source && isSourcePart(source as SourcePart)) { const part = source as SourcePart; return part.type === 'source-url' ? { id: part.sourceId, url: part.url, title: part.title } : { id: part.sourceId, title: part.title, filename: part.filename, mediaType: part.mediaType }; } return source as SourceItem; } export type AgentState = 'idle' | 'thinking' | 'working' | 'awaiting-approval' | 'done' | 'error'; export const AGENT_STATE_LABEL: Record = { idle: 'Idle', thinking: 'Thinking', working: 'Working', 'awaiting-approval': 'Waiting for approval', done: 'Done', error: 'Error', }; export interface DerivedAgentState { state: AgentState; /** Short human detail, e.g. "read_file" or "Writing response". */ detail?: string | undefined; } /** * Map `useChat` status plus the latest assistant message to a single agent state. * Human-in-the-loop waits (approvals, client-side tools awaiting output) take * precedence over transport status, because the run cannot progress without the user. */ export function deriveAgentState({ status, message, pendingClientTools = [], }: { status: ChatStatus; message?: Pick | undefined; /** Names of client-side tools whose `input-available` state means "waiting for the user". */ pendingClientTools?: readonly string[]; }): DerivedAgentState { if (status === 'error') return { state: 'error' }; const parts = message?.role === 'assistant' ? message.parts : []; const tools = getToolParts(parts); const approval = tools.find((t) => t.state === 'approval-requested' && !isAutomaticApproval(t.approval)); if (approval) return { state: 'awaiting-approval', detail: getToolPartName(approval) }; const clientWait = tools.find( (t) => t.state === 'input-available' && pendingClientTools.includes(getToolPartName(t)), ); if (clientWait && status !== 'submitted') return { state: 'awaiting-approval', detail: getToolPartName(clientWait) }; if (status === 'submitted') return { state: 'thinking' }; if (status === 'streaming') { const last = parts.at(-1); if (!last || last.type === 'step-start' || last.type === 'reasoning') return { state: 'thinking' }; if (isToolPart(last)) return { state: 'working', detail: getToolPartName(last) }; if (last.type === 'text') return { state: 'working', detail: 'Writing response' }; return { state: 'working' }; } return parts.length > 0 ? { state: 'done' } : { state: 'idle' }; } 75:T1071,/** Formatting helpers shared by the components. All output is locale-stable. */ /* * Each unit is chosen by the value as it will be printed, not the raw value: otherwise rounding * produces "1000ms", "60.0s" or "1000.0k" instead of moving up to the next unit. */ export function formatDuration(ms: number | undefined | null): string { if (ms == null || !Number.isFinite(ms) || ms < 0) return '–'; if (Math.round(ms) < 1000) return `${Math.round(ms)}ms`; const centis = (ms / 1000).toFixed(2); if (Number(centis) < 10) return `${centis}s`; const tenths = (ms / 1000).toFixed(1); if (Number(tenths) < 60) return `${tenths}s`; const seconds = Math.round(ms / 1000); return `${Math.floor(seconds / 60)}m ${String(seconds % 60).padStart(2, '0')}s`; } /** Spoken form for screen readers, e.g. "1.2 seconds". */ export function formatDurationLong(ms: number | undefined | null): string { if (ms == null || !Number.isFinite(ms) || ms < 0) return 'unknown duration'; if (Math.round(ms) < 1000) return `${Math.round(ms)} milliseconds`; const tenths = (ms / 1000).toFixed(1); if (Number(tenths) < 60) return `${tenths} seconds`; const total = Math.round(ms / 1000); const minutes = Math.floor(total / 60); const rest = total % 60; return `${minutes} minute${minutes === 1 ? '' : 's'} ${rest} second${rest === 1 ? '' : 's'}`; } export function formatTokens(n: number | undefined | null): string { if (n == null || !Number.isFinite(n)) return '–'; if (Math.abs(Math.round(n)) < 1000) return String(Math.round(n)); const hundredths = (n / 1000).toFixed(2); if (Math.abs(Number(hundredths)) < 10) return `${hundredths}k`; const tenths = (n / 1000).toFixed(1); if (Math.abs(Number(tenths)) < 1000) return `${tenths}k`; return `${(n / 1_000_000).toFixed(2)}M`; } export function formatCost(usd: number | undefined | null): string { if (usd == null || !Number.isFinite(usd)) return '–'; if (usd === 0) return '$0.00'; const four = usd.toFixed(4); if (Math.abs(Number(four)) < 0.01) return `$${four}`; const three = usd.toFixed(3); if (Math.abs(Number(three)) < 1) return `$${three}`; return `$${usd.toFixed(2)}`; } /** `read_file` / `readFile` / `read-file` → "Read file". */ export function humanizeToolName(name: string): string { const spaced = name .replace(/[_-]+/g, ' ') .replace(/([a-z0-9])([A-Z])/g, '$1 $2') .trim() .toLowerCase(); return spaced.charAt(0).toUpperCase() + spaced.slice(1); } export function getHostname(url: string): string { try { return new URL(url).hostname.replace(/^www\./, ''); } catch { return url; } } /** Compact one-line preview of an arbitrary tool input. */ export function summarizeValue(value: unknown, max = 72): string | undefined { if (value == null) return undefined; let text: string; if (typeof value === 'string') text = value; else if (typeof value === 'number' || typeof value === 'boolean') text = String(value); else if (typeof value === 'object') { const entries = Object.entries(value as Record); if (entries.length === 0) return undefined; // Prefer the first string-ish field: it is usually the most descriptive (query, path, command). const primary = entries.find(([, v]) => typeof v === 'string'); text = primary ? String(primary[1]) : entries.map(([k, v]) => `${k}: ${typeof v === 'object' ? '…' : String(v)}`).join(', '); } else return undefined; text = text.replace(/\s+/g, ' ').trim(); return text.length > max ? `${text.slice(0, max - 1)}…` : text; } export function safeStringify(value: unknown, space = 2): string { if (value === undefined) return 'undefined'; if (typeof value === 'string') return JSON.stringify(value); const seen = new WeakSet

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