/**
 * @name payments/json-rpc-error
 * @description Structured JSON-RPC / MCP error detection for settlement gating.
 *
 * Solking disclosure 2026-09-07 (Finding 6): the previous implementation
 * substring-matched `"error"` inside tool output text, so ANY paid tool whose
 * JSON output contained `"error":null` had its settlement skipped while the
 * buffered HTTP 200 still reached the client — a free-call bypass for funded
 * wallets. This module replaces that heuristic with structured checks only:
 *
 *   1. JSON-RPC error object:  { "error": { "code": ... } }
 *   2. JSON-RPC string error:  { "error": "..." }
 *   3. MCP tool-level flag:    { "result": { ..., "isError": true } }
 *   4. MCP content-item flag:  { "result": { "content": [ { "isError": true } ] } }
 *
 * Nothing else counts as an error. Text that merely contains the word
 * "error" (or `"error":null` inside a nested JSON string) is successful
 * output and MUST be settled.
 *
 * @module payments/json-rpc-error
 */
/**
 * @name isJsonRpcError
 * @description Decide whether a buffered JSON-RPC/MCP response body represents
 * a failed call using STRUCTURED fields only — never substring heuristics.
 *
 * @param body - The buffered HTTP response body.
 * @returns True only when a structured error shape is present.
 */
export declare function isJsonRpcError(body: Buffer): boolean;
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