import type { AgentStore } from './spi/agent-store.js';
/**
 * The thread's pinned persona: one column when the store projects it
 * (`AgentStore.personaForThread`), else through the full read. `null` → none pinned (or no thread).
 */
export declare function threadPersona(store: AgentStore, threadId: string): Promise<string | null>;
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