\begin{figure}[ht]
\centering
\begin{tikzpicture}[
  font=\footnotesize,
  actor/.style={draw=ipsblue, rounded corners=2pt, align=center, minimum width=1.7cm, minimum height=0.7cm, fill=codebg},
  msg/.style={-{Latex}, thick},
  note/.style={align=left, font=\scriptsize\color{ipsgrey}}
]
  \node[actor] (d) {Desktop};
  \node[actor, right=1.5cm of d] (g) {Gateway};
  \node[actor, right=1.5cm of g] (a) {API bot};
  \node[actor, right=1.5cm of a] (w) {Agent};
  \node[actor, right=1.5cm of w] (m) {MinIO};

  \coordinate (top) at ($(d.south)+(0,-0.35)$);
  \foreach \n in {d,g,a,w,m} {
    \draw[ipsgrey!60] (\n.south) -- ++(0,-5.6);
  }

  \draw[msg] ($(w.south)+(0,-0.5)$) -- node[above,font=\scriptsize]{register + heartbeat} ($(a.south)+(0,-0.5)$);
  \draw[msg] ($(d.south)+(0,-1.3)$) -- node[above,font=\scriptsize]{POST /jobs (Excel)} ($(a.south)+(0,-1.3)$);
  \draw[msg] ($(a.south)+(0,-2.0)$) -- node[above,font=\scriptsize]{PutObject Excel} ($(m.south)+(0,-2.0)$);
  \draw[msg] ($(w.south)+(0,-2.7)$) -- node[above,font=\scriptsize]{claim\_pending} ($(a.south)+(0,-2.7)$);
  \draw[msg] ($(w.south)+(0,-3.4)$) -- node[above,font=\scriptsize]{GET Excel / Put PDFs} ($(m.south)+(0,-3.4)$);
  \draw[msg] ($(w.south)+(0,-4.1)$) -- node[above,font=\scriptsize]{POST events} ($(a.south)+(0,-4.1)$);
  \draw[msg] ($(w.south)+(0,-4.8)$) -- node[above,font=\scriptsize]{PATCH completed} ($(a.south)+(0,-4.8)$);
  \draw[msg] ($(d.south)+(0,-5.4)$) -- node[above,font=\scriptsize]{poll job + files} ($(a.south)+(0,-5.4)$);
\end{tikzpicture}
\caption{Secuencia del flujo bot de descarga.}
\label{fig:flujo-bot}
\end{figure}