import type { AgentSystem } from "../types.js";
import type { ChatSystemMessage } from "../../chat/types.js";
/** Server-authored UTC facts captured once for one agent run. */
export type AgentRunRuntimeContext = Readonly<{
    currentTimeUtc: string;
    currentDateUtc: string;
    runStartedAtUtc: string;
}>;
/** Capture the immutable UTC snapshot for one agent run. */
export declare function captureAgentRunRuntimeContext(now?: Date): AgentRunRuntimeContext;
/** Render the authoritative UTC snapshot as a reserved system block. */
export declare function buildAgentRunRuntimeContextPromptBlock(context: AgentRunRuntimeContext): string;
/** Replace authored reserved blocks and append the server snapshot last. */
export declare function withAgentRunRuntimeContext(instructions: string, context: AgentRunRuntimeContext): string;
export declare function withAgentRunRuntimeContext(instructions: ChatSystemMessage[], context: AgentRunRuntimeContext): ChatSystemMessage[];
export declare function withAgentRunRuntimeContext(instructions: AgentSystem, context: AgentRunRuntimeContext): AgentSystem;
/** Add the exact run snapshot to response diagnostics without dropping other metadata. */
export declare function withAgentRunRuntimeContextMetadata(context: AgentRunRuntimeContext, metadata?: Record<string, unknown>): Record<string, unknown>;
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