  In light of the recently observed resonance states $P_{\psi
s}^{\Lambda}(4338)^0$ and $P_{cs}(4459)^0$ by LHCb Collaboration in
$J/\psi\Lambda$ decay channel, we perform a systematical study of all possible
hidden-heavy pentaquarks with strangeness $S=0,-1,-2,-3$, in unified framework
of MIT bag model. The color-spin wavefunctions presented in terms of
Young-Yamanouchi bases and transformed into baryon-meson couplings, are
utilized to calculate masses, magnetic moments and ratios of partial widths.
With numerical analysis, the observed $P_{\psi s}^{\Lambda}(4338)^0$ is likely
to be a $1/2^-$ compact $P_{cs}$ pentaquark, and $P_{cs}(4459)^0$ favors
two-peak structure of $3/2^-$ and $1/2^-$ $P_{cs}$ states. Further predictions
on hadron properties and decay channels are given to compact $P_{css}$,
$P_{csss}$ states and bottom sectors.
