Function jsonRpcError

e2e/cloud/mcp-destroyed-session-envelope.test.ts:90–102

(body: string)

/** One JSON-RPC error shape, or null when the body is not the protocol envelope. */
const jsonRpcError = (body: string): { readonly code: number; readonly message: string } | null => {
  // oxlint-disable-next-line executor/no-try-catch-or-throw -- test helper: a non-JSON body is itself the signal we assert on
  try {
    const parsed = JSON.parse(body) as {
      readonly jsonrpc?: string;
      readonly error?: { readonly code?: number; readonly message?: string };
    };
    if (parsed.jsonrpc !== "2.0" || typeof parsed.error?.code !== "number") return null;
    return { code: parsed.error.code, message: parsed.error.message ?? "" };
  } catch {
    return null;
  }
};

/**
 * The verdict a request gets once the destroy alarm has wiped the session's