export interface AdapterSendProxy {
    readonly fetchImpl: typeof fetch;
    close(): Promise<void>;
    destroy(error?: Error): Promise<void>;
}
export interface AdapterSendProxyOptions {
    /** Explicit configured endpoints that may need SRT's coarse loopback capability. */
    readonly directLoopbackUrls?: readonly string[];
}
export declare function safeAdapterSendProxyErrorMessage(error: unknown, env?: Record<string, string | undefined>): string;
/**
 * Build the adapter-send child's HTTP transport from its inherited proxy
 * environment. The parent MCP spec deliberately does not copy these values:
 * credentials stay in process environment state and never enter the serialized
 * runtime/tool configuration.
 */
export declare function createAdapterSendProxy(env?: Record<string, string | undefined>, options?: AdapterSendProxyOptions): AdapterSendProxy | undefined;
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