Function jsonRpcError

mcp/src/http-server.ts:355–366

(
  body: unknown,
  code: number,
  message: string,
)

}

function jsonRpcError(
  body: unknown,
  code: number,
  message: string,
): Record<string, unknown> {
  // Preserve the request id when we can identify it; otherwise null.
  const id =
    body && typeof body === "object" && "id" in body
      ? (body as { id: unknown }).id
      : null;
  return { jsonrpc: "2.0", id, error: { code, message } };
}

/**
 * Start the HTTP server on `port`. Returns a closer that stops the listener —