/**
 * [WHO]: SessionStats and pure session/context queries
 * [FROM]: Agent/AI message types and session compaction accounting
 * [TO]: AgentSession and regression tests
 * [HERE]: core/runtime/session-queries.ts - pure snapshot queries
 */
import type { AgentMessage } from "@catui/agent-core";
import type { Model } from "@catui/ai/types";
import type { ContextUsage } from "../extensions-host/index.js";
import { type SessionEntry } from "../session/session-manager.js";
/** Session statistics for /session command */
export interface SessionStats {
    sessionFile: string | undefined;
    sessionId: string;
    userMessages: number;
    assistantMessages: number;
    toolCalls: number;
    toolResults: number;
    totalMessages: number;
    tokens: {
        input: number;
        output: number;
        cacheRead: number;
        cacheWrite: number;
        total: number;
    };
    cost: number;
}
export declare function getSessionStats(messages: AgentMessage[], sessionFile: string | undefined, sessionId: string): SessionStats;
export declare function getContextUsage(messages: AgentMessage[], model: Model<any> | undefined, branchEntries: SessionEntry[]): ContextUsage | undefined;
export declare function extractUserMessageText(content: string | Array<{
    type: string;
    text?: string;
}>): string;