import { type DrizzleExecutor } from "../drizzle.js";
import { type MutationHint } from "../chat/types.js";
/**
 * Initializes a users agent-effort preference only when no explicit value has been stored yet.
 * The conditional write preserves a user's later choice while still giving newly provisioned agents a deterministic default.
 */
export declare function agentEffortInitialize(executor: DrizzleExecutor, agentUserId: string, effort: string): Promise<MutationHint | undefined>;
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