/** Minimal shape of the OpenClaw plugin API surface we need. */
export interface SpanHooksPluginApi {
    on(hookName: string, handler: (...args: unknown[]) => void | Promise<void>, opts?: {
        priority?: number;
    }): void;
}
export interface RegisterSpanHooksOptions {
    api: SpanHooksPluginApi;
}
/**
 * Grace window the `agent_end` sweep holds a finished model span before ending it, so a
 * trailing `llm_output` (observed ~1 ms later in the codex/harness flow, but timed generously)
 * can finalize it with token usage + output messages first. Unref'd, so it never holds the
 * process open; an orphan run with no `llm_output` lets the timer end the span.
 */
export declare const MODEL_SPAN_END_GRACE_MS = 2000;
export declare function registerSpanHooks(options: RegisterSpanHooksOptions): void;
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