import type { MessageSummary, MutationHint } from "../chat/types.js";
import type { DrizzleExecutor } from "../drizzle.js";
/**
 * Materializes the empty assistant reply, links agentTurns, and inserts the first agentTurnTraceEntries span for an active agent's worker-owned running turn.
 * Requiring users.active prevents stale sessions from creating output; authorized retries reuse the stable message identity and only publish when the trace had to be initialized.
 */
export declare function agentTurnTraceStart(executor: DrizzleExecutor, input: {
    agentUserId: string;
    actorUserId: string;
    chatId: string;
    sessionId: string;
    startedAt: string;
    userMessageId: string;
    workerId: string;
}): Promise<{
    message: MessageSummary;
    hint: MutationHint;
} | undefined>;
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