import type { OrchestrationThreadActivity, ThreadTokenUsageSnapshot } from "@t3tools/contracts"; function asRecord(value: unknown): Record<string, unknown> | null {  return value && typeof value === "object" ? (value as Record<string, unknown>) : null;} function asFiniteNumber(value: unknown): number | null {  return typeof value === "number" && Number.isFinite(value) ? value : null;} function asBoolean(value: unknown): boolean | null {  return typeof value === "boolean" ? value : null;} type NullableContextWindowUsage = {  readonly [Key in keyof ThreadTokenUsageSnapshot]: undefined extends ThreadTokenUsageSnapshot[Key]    ? Exclude<ThreadTokenUsageSnapshot[Key], undefined> | null    : ThreadTokenUsageSnapshot[Key];}; export type ContextWindowSnapshot = NullableContextWindowUsage & {  readonly remainingTokens: number | null;  readonly usedPercentage: number | null;  readonly remainingPercentage: number | null;  readonly updatedAt: string;}; /** Map a provider driver kind to a user-facing display name. */export function formatProviderDisplayName(provider: string | null | undefined): string {  if (!provider) return "This agent";  switch (provider) {    case "claudeAgent":    case "claude":      return "Claude";    case "codex":      return "Codex";    case "cursor":      return "Cursor";    case "opencode":      return "OpenCode";    default: {      // Title-case unknown driver kinds so they read reasonably.      const trimmed = provider.replace(/Agent$/i, "").trim();      if (trimmed.length === 0) return provider;      return trimmed.charAt(0).toUpperCase() + trimmed.slice(1);    }  }} export function deriveLatestContextWindowSnapshot(  activities: ReadonlyArray<OrchestrationThreadActivity>,): ContextWindowSnapshot | null {  for (let index = activities.length - 1; index >= 0; index -= 1) {    const activity = activities[index];    if (!activity || activity.kind !== "context-window.updated") {      continue;    }     const payload = asRecord(activity.payload);    const usedTokens = asFiniteNumber(payload?.usedTokens);    if (usedTokens === null || usedTokens < 0) {      continue;    }     const maxTokens = asFiniteNumber(payload?.maxTokens);    const usedPercentage =      maxTokens !== null && maxTokens > 0 ? Math.min(100, (usedTokens / maxTokens) * 100) : null;    const remainingTokens =      maxTokens !== null ? Math.max(0, Math.round(maxTokens - usedTokens)) : null;    const remainingPercentage = usedPercentage !== null ? Math.max(0, 100 - usedPercentage) : null;     return {      usedTokens,      totalProcessedTokens: asFiniteNumber(payload?.totalProcessedTokens),      maxTokens,      remainingTokens,      usedPercentage,      remainingPercentage,      inputTokens: asFiniteNumber(payload?.inputTokens),      cachedInputTokens: asFiniteNumber(payload?.cachedInputTokens),      outputTokens: asFiniteNumber(payload?.outputTokens),      reasoningOutputTokens: asFiniteNumber(payload?.reasoningOutputTokens),      lastUsedTokens: asFiniteNumber(payload?.lastUsedTokens),      lastInputTokens: asFiniteNumber(payload?.lastInputTokens),      lastCachedInputTokens: asFiniteNumber(payload?.lastCachedInputTokens),      lastOutputTokens: asFiniteNumber(payload?.lastOutputTokens),      lastReasoningOutputTokens: asFiniteNumber(payload?.lastReasoningOutputTokens),      toolUses: asFiniteNumber(payload?.toolUses),      durationMs: asFiniteNumber(payload?.durationMs),      compactsAutomatically: asBoolean(payload?.compactsAutomatically) ?? false,      autoCompactThreshold: asFiniteNumber(payload?.autoCompactThreshold),      updatedAt: activity.createdAt,    };  }   return null;} export function formatContextWindowTokens(value: number | null): string {  if (value === null || !Number.isFinite(value)) {    return "0";  }  if (value < 1_000) {    return `${Math.round(value)}`;  }  if (value < 10_000) {    return `${(value / 1_000).toFixed(1).replace(/\.0$/, "")}k`;  }  if (value < 1_000_000) {    return `${Math.round(value / 1_000)}k`;  }  return `${(value / 1_000_000).toFixed(1).replace(/\.0$/, "")}m`;}