import type { EndpointRegistry } from "./endpoint-registry.js";
export declare const TASK_HINT_MAX_LENGTH = 200;
export interface TaskHintHandlerOptions {
    registry: EndpointRegistry;
}
export interface TaskHintUpdate {
    endpoint_id: string;
    plugin_pid: number;
    task_hint: string;
}
export type TaskHintResult = {
    ok: true;
    truncated: boolean;
    effective: string;
} | {
    ok: false;
    code: "endpoint_unknown" | "ownership_mismatch" | "task_hint_invalid";
    message: string;
};
export declare function updateTaskHint(opts: TaskHintHandlerOptions, update: TaskHintUpdate): TaskHintResult;
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