import type { SectionOverride, SystemMessageConfig, SystemMessageSection } from "@github/copilot-sdk";
import type { SerializableSessionConfig } from "./types.js";
import type { PromptLayerDescriptor } from "./prompt-layers.js";
export type PromptLayeringKind = NonNullable<SerializableSessionConfig["promptLayering"]>["kind"];
export interface ComposeSystemPromptOptions {
    frameworkBase?: string | null;
    appDefault?: string | null;
    activeAgentPrompt?: string | null;
    runtimeContext?: string | null;
    includeAppDefault?: boolean;
    /** Optional authored layer descriptors. When present, a layer manifest is rendered above the framework header. */
    layerManifest?: ReadonlyArray<PromptLayerDescriptor> | null;
}
export interface ComposeStructuredSystemMessageOptions extends ComposeSystemPromptOptions {
    additionalSections?: Partial<Record<SystemMessageSection, SectionOverride>>;
    additionalContent?: string | null;
}
export declare function mergePromptSections(parts: Array<string | null | undefined>): string | undefined;
export declare function extractPromptContent(message?: string | {
    mode: "append" | "replace";
    content: string;
} | null): string | undefined;
export declare function buildPromptLayerSections(options: ComposeSystemPromptOptions): Partial<Record<SystemMessageSection, SectionOverride>>;
export declare function composeStructuredSystemMessage(options: ComposeStructuredSystemMessageOptions): SystemMessageConfig | undefined;
export declare function composeSystemPrompt(options: ComposeSystemPromptOptions): string | undefined;
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