/**
 * Objects the user picked with the composer's Select mode travel as ordinary
 * agent chat context items. This key namespace is what marks them as the
 * target set, so the prompt formatter and server actions can tell them apart
 * from ambient context such as the open page.
 */
export declare const AGENT_SELECTION_CONTEXT_KEY_PREFIX = "agent-select:";
/** application_state key mirroring the picked objects for actions to read. */
export declare const AGENT_SELECTION_STATE_KEY = "agent-selection";
export interface AgentSelectionReference {
    kind: string;
    id: string;
}
export interface AgentSelectionStateItem extends AgentSelectionReference {
    title: string;
}
export interface AgentSelectionState {
    items: AgentSelectionStateItem[];
    updatedAt: number;
}
export declare function agentSelectionContextKey(kind: string, id: string): string;
export declare function parseAgentSelectionContextKey(key: string): AgentSelectionReference | null;
export declare function isAgentSelectionContextKey(key: string): boolean;
/**
 * The preamble that makes picked objects the explicit target set. Returns an
 * empty string when nothing in `items` was picked with Select.
 */
export declare function formatAgentSelectionPreamble(items: readonly {
    key: string;
    title: string;
}[]): string;