/**
 * Provider/model attribution for subagent failure messages.
 *
 * A subagent can resolve to a different provider than its parent session:
 * modelRoles.task, agent frontmatter models, and catalog fallbacks can all
 * route a task away from the parent's transport. When such a spawn fails,
 * the raw stream error used to surface with no hint of which provider or
 * model produced it — in #4813 a Claude OAuth session reported Cursor
 * transport errors ("Connect error invalid_argument: Error") and the
 * misrouting was invisible to the user. Prefixing the failing model's
 * identity makes the failure name its transport, so a mismatch between the
 * expected provider and the one that actually errored is instantly visible.
 */
/** Minimal shape of the assistant message a failed turn leaves behind. */
export interface FailedAssistantModelInfo {
    provider?: string;
    model?: string;
}
/**
 * Attributes a subagent failure message with the provider/model that
 * produced it, falling back to the given text when the message is empty.
 * The prefix is skipped when the message already names the provider (some
 * provider errors embed it) or when no identity is known.
 */
export declare function attributeSubagentError(message: string | undefined, source: FailedAssistantModelInfo | undefined, fallback?: string): string;