/**
 * Core-2 snapshot builder — dead-simple fork snapshot.
 *
 * Strips batch read/write/edit bodies (keeping first 3 + last 3 lines as
 * orientation) and preserves all other conversation verbatim in
 * chronological order.
 */
import type { FlowTier, ContextProfile, ToolResultCategory } from "../flow/agents.js";
export type CompressionLevel = "none" | "light" | "medium" | "aggressive";
export interface CompressionStats {
    preBytes: number;
    postBytes: number;
    level: CompressionLevel;
    profileName?: string;
    messagesDropped: number;
    syntheticSummary?: string;
}
/**
 * Build a snapshot with optional context compression. If the estimated token
 * count exceeds the threshold (or an override is set), a second pass applies
 * the resolved compression level and profile.
 */
export declare function buildSnapshotWithCompression(sessionManager: SessionSnapshotSource, options?: BuildCore2SnapshotOptions, maxContextTokens?: number): {
    snapshot: string | null;
    stats?: CompressionStats;
};
export interface SessionSnapshotSource {
    getHeader: () => unknown;
    getBranch: () => unknown[];
}
export interface BuildCore2SnapshotOptions {
    forkedFrom?: string;
    forkedAt?: string;
    parentFlow?: string;
    depth?: number;
    activeToolCallId?: string;
    tier?: FlowTier;
    compressionLevel?: CompressionLevel;
    compressionProfile?: ContextProfile;
    /** If provided, compression stats are written here after the snapshot is built. */
    compressionStats?: CompressionStats;
}
/** Rough token estimate for a snapshot string (1 token ≈ 4 chars). */
export declare function estimateTotalContextTokens(snapshotJsonl: string): number;
/** Classify a tool/toolResult message into a category for profile-aware compression. */
export declare function classifyToolResult(entry: unknown): ToolResultCategory;
export declare function buildCore2Snapshot(sessionManager: SessionSnapshotSource, options?: BuildCore2SnapshotOptions): string | null;
export interface CompressionResult {
    entries: unknown[];
    droppedCount: number;
    syntheticSummary?: string;
}
export declare function applyContextCompression(entries: unknown[], level: CompressionLevel | undefined, profile?: ContextProfile): CompressionResult;
export interface SharedContext {
    messageCount: number;
    userMessageCount: number;
    assistantMessageCount: number;
    toolCalls: Record<string, number>;
    totalTokens: number;
    preview: string;
}
export declare function parseSharedContext(snapshotJsonl: string | null): SharedContext | undefined;
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