CSB Admin ESP lets an admin spot players through walls without changing what anyone else sees. It hooks FM_AddToFullPack and rewrites the entity render state (kRenderFxGlowShell plus a team colour) only in the packets destined for that one admin client. Because the change is per-recipient, ordinary players receive their normal packets and see no glow at all.
amx_esp [0|1], restricted by flag.FM_AddToFullPack for the requesting client only — server-side, no client mods.fakemeta module is enabled in addons/amxmodx/configs/modules.ini.csb_admin_esp.sma, copy it to addons/amxmodx/plugins/ and add it to plugins.ini.amx_esp needs the ADMIN_CFG flag (u) by default. This is an admin visibility aid, not a client cheat: the glow never reaches non-admin clients.