import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Reports username availability by performing a case-insensitive lookup across every persisted user identity.
 * Including deleted and non-agent rows preserves the global namespace and prevents a new agent from reclaiming an existing spelling variant.
 */
export declare function agentUsernameIsAvailable(executor: DrizzleExecutor, username: string): Promise<boolean>;
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