/**
 * @name tools/adrena/adrena-rpc-fallback
 * @description Shared Solana RPC fallback for Adrena on-chain reads.
 *
 * The hosted gateway frequently runs from datacenter IPs that the public
 * mainnet RPC throttles with HTTP 426 (Upgrade Required). Read tools that
 * go through `context.connection` therefore fail with 426 even though the
 * logic is correct. This helper retries the same read across the configured
 * primary RPC and well-known public fallbacks so a single blocked endpoint
 * does not fail the whole tool call.
 *
 * @module tools/adrena/adrena-rpc-fallback
 */
import { Connection } from '@solana/web3.js';
import type { SapMcpContext } from '../../../core/src/types.js';
/**
 * Run an on-chain read against the context connection, retrying across
 * public RPC fallbacks when the primary endpoint fails (426/403/429/5xx or
 * network error).
 * @param context — SAP MCP context.
 * @param operation — Read to execute with each candidate connection.
 * @param label — Error label used when every endpoint fails.
 * @returns The first successful result.
 * @throws Aggregated error when all endpoints fail.
 */
export declare function withAdrenaConnectionFallback<T>(context: SapMcpContext, operation: (connection: Connection, rpcUrl: string) => Promise<T>, label?: string): Promise<T>;
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