/** Plugin-owned, Step-scoped provenance; never a model route or durable message. */
export declare const ASSISTANT_ORIGIN_KEY = "github-copilot-assistant-origin";
type Dispose = () => void;
export interface AssistantOrigin {
    readonly seq: number;
    readonly provider: string;
    readonly model: string;
}
interface OriginState {
    readonly turn: number;
    readonly step: number;
    readonly origin: AssistantOrigin | undefined;
}
interface OriginMatch {
    readonly event: unknown;
}
interface OriginContext {
    readonly state?: OriginState | undefined;
    readonly matches: readonly OriginMatch[];
}
interface OriginLocationData {
    readonly kind: 'step';
    readonly turn: number;
    readonly step: number;
    readonly key: typeof ASSISTANT_ORIGIN_KEY;
    readonly value: AssistantOrigin;
}
/** Targetless Definition: registration rebuilds existing bindings, including cold history. */
export declare const assistantOriginDefinition: {
    kind: string;
    match(event: unknown): {
        id: string;
        role: "start" | "update";
    } | null;
    start(_context: OriginContext, match: OriginMatch): OriginState;
    update(context: OriginContext & {
        readonly state: OriginState;
    }, match: OriginMatch): OriginState;
    buildLocationData(context: OriginContext, scope: string, previous: OriginLocationData | null): OriginLocationData | null;
};
/** Shallow UI-only projection. Unchanged input retains its exact props identity. */
export declare function projectReasoningPresentation<Props extends object>(props: Props, origin: unknown): Props;
export interface ReasoningPresentationCapabilities {
    readonly slots: unknown;
    readonly uiConversation: unknown;
    /** Receives stable codes only, never message text, model payloads or error bodies. */
    readonly diagnostic: (code: string) => void;
}
/**
 * Optional Client enhancement. The caller owns the returned disposer in its
 * dependency-scoped effect; missing older-Core seams leave native UI alone.
 */
export declare function installReasoningPresentation(capabilities: ReasoningPresentationCapabilities): Dispose;
export {};
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