Bad spacing when executing two user defined commands side by side

Question

Here is what I'm trying to achieve:

To this purpose I've written the following commands:

\documentclass[11pt]{article}
\usepackage[utf8]{luainputenc}
\setdefaultlanguage[variant=us]{english}
\setmainfont{CMU Concrete}
\setsansfont{CMU Sans Serif}
\setmonofont{CMU Typewriter Text}
\usepackage{xspace}
\usepackage{xparse}
\usepackage[dvipsnames]{xcolor}
\definecolor{keywdcolor}{HTML}{bf616a}
\DeclareDocumentCommand{\keywd}{m}{
    \ttfamily\bfseries
    \textcolor{keywdcolor}{#1}
}
\DeclareDocumentCommand{\apicmd}{m}{
    \keywd{\textbackslash#1\xspace}
}
\DeclareDocumentCommand{\apienv}{m}{
    \keywd{{#1}\xspace}
}
\definecolor{argscolor}{HTML}{a3be8c}
\DeclareDocumentCommand{\argcontent}{m}{
    \ttfamily\bfseries
    \textcolor{argscolor}{\xspace\ensuremath{\langle}\textit{#1}\ensuremath{\rangle}\xspace}
}

but when I try to implement it like this:

\begin{document}
   \apicmd{path}\apiopt{shape}
\end{document}

this is the result:


Any idea why this happens and how I could correct it?