export interface SessionFrictionOptions {
    limit?: number;
    session?: string;
    since?: string;
    project?: string;
    cwd?: string;
    now?: number;
    codexHomeDir?: string;
    codexHomeDirs?: string[];
}
export interface SessionFrictionSourceReport {
    codex_home: string;
    scanned_files: number;
}
export interface SessionFrictionRisk {
    code: string;
    severity: 'info' | 'warn' | 'high';
    message: string;
}
export interface SessionFrictionSessionReport {
    session_id: string;
    started_at: string | null;
    last_activity_at: string | null;
    age_minutes: number | null;
    idle_minutes: number | null;
    cwd_basename: string | null;
    cwd_hash: string | null;
    source: {
        codex_home: string;
        transcript_ref: string;
    };
    counters: {
        records: number;
        malformed_records: number;
        bytes: number;
        user_turns: number;
        assistant_turns: number;
        tool_calls: number;
        tool_outputs: number;
    };
    context_growth: {
        approx_transcript_kb: number;
        avg_record_bytes: number;
        tool_call_ratio: number;
    };
    idle_gaps: {
        max_gap_minutes: number | null;
        gaps_over_30m: number;
        gaps_over_2h: number;
    };
    tool_names: Array<{
        name: string;
        count: number;
    }>;
    risks: SessionFrictionRisk[];
}
export interface SessionFrictionReport {
    generated_at: string;
    privacy: {
        mode: 'metadata-only';
        excludes: string[];
    };
    scanned_files: number;
    sources: SessionFrictionSourceReport[];
    sessions: SessionFrictionSessionReport[];
}
export declare function buildSessionFrictionReport(options?: SessionFrictionOptions): Promise<SessionFrictionReport>;
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