import type { ExtensionAPI, ExtensionContext } from "@earendil-works/pi-coding-agent";
import type { ProviderHeaders } from "@earendil-works/pi-ai";
/** Parent linkage and classification are independent of context sharing. */
export interface CodexAgentRelationship {
    parentThreadId?: string;
    subagentKind?: string;
    /** Optional routing affinity, not a native thread or shared-history identity. */
    cacheAffinityId?: string;
}
export declare function codexAgentRelationship(ctx: Pick<ExtensionContext, "sessionManager">): CodexAgentRelationship | undefined;
export declare function bindCodexAgentRelationship(pi: ExtensionAPI, ctx: ExtensionContext, input: unknown): CodexAgentRelationship;
export declare function relationshipTurnMetadata(ctx: Pick<ExtensionContext, "sessionManager">): Record<string, string>;
export declare function rewriteRelationshipHeaders(headers: ProviderHeaders, ctx: ExtensionContext): void;
export declare function rewriteRelationshipPayload(payload: unknown, ctx: ExtensionContext): unknown;