/**
 * Manages MCP sessions for the Streamable HTTP transport.
 * Sessions are created during initialization and validated on subsequent requests.
 *
 * Sessions expire after a period of inactivity so that clients which disconnect
 * uncleanly (closed tab, crash, dropped network) don't leak entries forever.
 * Expiry is lazy: stale entries are pruned on access, so no background timer is
 * required.
 */
export interface SessionManagerOptions {
    /** Inactivity TTL in ms (default 30 minutes). */
    ttlMs?: number;
    /** Clock, injectable for tests. Defaults to Date.now. */
    now?: () => number;
}
export declare class SessionManager {
    /** id -> last-seen timestamp (ms). */
    private sessions;
    private readonly ttlMs;
    private readonly now;
    private sessionHeaderRequired;
    constructor(options?: SessionManagerOptions);
    create(): string;
    isValid(id: string): boolean;
    terminate(id: string): void;
    get size(): number;
    clear(): void;
    requiresSessionHeader(): boolean;
    private isExpired;
    private pruneExpired;
}
//# sourceMappingURL=session.d.ts.map