import type { AgentUsage } from "@automatalabs/shared-types";
import type { Cost, Usage } from "@agentclientprotocol/sdk";
export interface UsageBaseline {
    costAmount: number;
    contextUsedTokens: number;
}
export declare class UsageAccumulator {
    private promptUsage;
    private costAmount;
    private contextUsedTokens;
    private contextSizeTokens;
    /** Record the authoritative per-turn token usage from a PromptResponse. */
    recordPromptUsage(usage: Usage | null | undefined): void;
    /** Record the latest cumulative dollar cost carried by a usage_update notification. */
    recordCost(cost: Cost | null | undefined): void;
    /**
     * Record the token counts carried by a usage_update notification: `used` (tokens
     * currently in context) and `size` (context window). These feed `total` as a fallback
     * for backends that report tokens via usage_update but never via PromptResponse.usage,
     * so AgentUsage.total is non-zero whenever the backend reported ANY token count.
     */
    recordContextTokens(used: number | null | undefined, size?: number | null | undefined): void;
    /** Snapshot the cumulative/gauge channels before a continuation turn begins. */
    baseline(): UsageBaseline;
    /** Report only usage observed after a reopened session's replay/setup boundary. */
    delta(baseline: UsageBaseline): AgentUsage;
    toAgentUsage(): AgentUsage;
}
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