import type { UsageStats } from "../types/flow.js";
/** Rough context size before the child prompt is built (fork + intent + activation). */
export declare function computeInitialContextTokens(sharedContext: {
    totalTokens?: number;
} | undefined, intent: string, prompt?: string, activationOverhead?: number): number;
/**
 * Resolve the context token count to show in flow/trace headers.
 * Prefers live flow usage, then forked shared-context snapshot, then a coarse
 * fallback from per-turn input+output when providers omit totalTokens.
 */
export declare function resolveDisplayContextTokens(usage: Pick<UsageStats, "contextTokens" | "input" | "output">, sharedContext?: {
    totalTokens: number;
}): number;
/** Merge streaming context estimate into usage (max with baseline). */
export declare function mergeStreamingContextTokens(usage: Pick<UsageStats, "contextTokens" | "input" | "output">, ctxEstimate: number, sharedContext?: {
    totalTokens: number;
}): number;
/** Format a compression level as a short indicator for the TUI dashboard. */
export declare function formatCompressionIndicator(level?: string): string;
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