  KAgF$_3$ is a quasi one-dimensional quantum antiferromagnet hosting a series
of intriguing structural and magnetic transitions. Here we use powder neutron
diffraction, $\mu$SR spectroscopy, and Density Functional Theory calculations
to elucidate the low temperature magnetic phases. Below $T_{N1}=29$K we find
that the material orders as an A-type antiferromagnet with an ordered moment of
0.47$\mu_{\rm B}$. Both neutrons and muons provide evidence for an intermediate
phase at temperatures $T_{N1}<T<T_{N2}$ with $T_{N2}\approx 66$ K from a
previous magnetometry study. However, the evidence is at the limit of detection
and its nature remains an open problem.
