/**
 * LangChainStreamingAdapter — LangChainAdapter with real incremental streaming.
 *
 * Extends {@link LangChainAdapter} with genuine streaming via the LangChain
 * Runnable `.stream()` interface. Falls back gracefully to `.invoke()` for
 * agents whose Runnable does not expose `.stream()`.
 *
 * Usage (drop-in replacement for LangChainAdapter):
 *
 *   const adapter = new LangChainStreamingAdapter();
 *   adapter.registerAgent('analyst', myChain);        // same API
 *   await registry.addAdapter(adapter);
 *
 *   // Stream the response
 *   for await (const chunk of adapter.executeAgentStream('analyst', payload, ctx)) {
 *     process.stdout.write(chunk.text);
 *     if (chunk.done) break;
 *   }
 *
 * @module LangChainStreamingAdapter
 * @version 1.0.0
 */
import type { AgentPayload, AgentContext, AdapterCapabilities } from '../types/agent-adapter';
import type { StreamingChunk } from '../types/streaming-adapter';
import type { IStreamingAdapter } from '../types/streaming-adapter';
import { LangChainAdapter, LangChainRunnable } from './langchain-adapter';
export declare class LangChainStreamingAdapter extends LangChainAdapter implements IStreamingAdapter {
    private streamableAgentIds;
    get capabilities(): AdapterCapabilities;
    /**
     * Register a LangChain agent. Automatically detects `.stream()` support.
     */
    registerAgent(agentId: string, runnable: LangChainRunnable, metadata?: {
        description?: string;
        capabilities?: string[];
    }): void;
    /** Returns `true` when the agent exposes LangChain's `.stream()` method. */
    supportsStreaming(agentId: string): boolean;
    /**
     * Stream agent execution as incremental `StreamingChunk` values.
     *
     * - If the registered Runnable exposes `.stream()`, emits tokens incrementally.
     * - Otherwise falls back to `.invoke()` and emits a single chunk.
     */
    executeAgentStream(agentId: string, payload: AgentPayload, context: AgentContext): AsyncIterable<StreamingChunk>;
    private _fallbackStream;
}
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