/**
 * Context window monitoring core module.
 * @task T4535
 * @epic T4454
 */
/** Get context status. */
export declare function getContextStatus(opts: {
    session?: string;
    cwd?: string;
}): Promise<Record<string, unknown>>;
/** Check context threshold (returns exit code info). */
export declare function checkContextThreshold(opts: {
    session?: string;
    cwd?: string;
}): Promise<Record<string, unknown> & {
    exitCode?: number;
}>;
/** List all context state files. */
export declare function listContextSessions(cwd?: string): Promise<Record<string, unknown>>;
/** Context window monitoring data shape. */
export interface ContextData {
    /** Whether context data is available. */
    available: boolean;
    /** Status level (ok, warning, caution, critical, emergency, stale, unavailable, error). */
    status: string;
    /** Usage percentage (0-100). */
    percentage: number;
    /** Current token usage. */
    currentTokens: number;
    /** Maximum context window size. */
    maxTokens: number;
    /** ISO timestamp of last update, or null. */
    timestamp: string | null;
    /** Whether the data is stale (older than configured threshold). */
    stale: boolean;
    /** Per-session context state entries. */
    sessions: Array<{
        /** State file path. */
        file: string;
        /** Session ID, or null. */
        sessionId: string | null;
        /** Usage percentage. */
        percentage: number;
        /** Status level. */
        status: string;
        /** ISO timestamp. */
        timestamp: string;
    }>;
}
/**
 * Get full context window data including all sessions.
 *
 * Replaces the `systemContext` function from system-engine.ts, moving
 * the FS traversal logic into core. Returns structured {@link ContextData}
 * with per-session breakdowns and staleness detection.
 *
 * @param cwd - Absolute path to the project root
 * @param opts - Optional filter parameters
 * @returns Structured context window monitoring data
 *
 * @task T1571
 */
export declare function getContextWindow(cwd: string, opts?: {
    session?: string;
}): ContextData;
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