diff --git a/lib/towerops_web/channels/agent_channel.ex b/lib/towerops_web/channels/agent_channel.ex
index 7cea1859..98772960 100644
--- a/lib/towerops_web/channels/agent_channel.ex
+++ b/lib/towerops_web/channels/agent_channel.ex
@@ -381,6 +381,17 @@ defmodule ToweropsWeb.AgentChannel do
   end
 
   defp build_v3_snmp_device(device, snmp_config) do
+    # Log what we're sending to agent (mask passwords)
+    Logger.info(
+      "Sending SNMPv3 credentials to agent for #{device.name}: " <>
+        "username=#{snmp_config.username}, " <>
+        "security_level=#{snmp_config.security_level}, " <>
+        "auth_protocol=#{snmp_config.auth_protocol}, " <>
+        "priv_protocol=#{snmp_config.priv_protocol}, " <>
+        "auth_password_length=#{if snmp_config.auth_password, do: byte_size(snmp_config.auth_password), else: 0}, " <>
+        "priv_password_length=#{if snmp_config.priv_password, do: byte_size(snmp_config.priv_password), else: 0}"
+    )
+
     %SnmpDevice{
       ip: device.ip_address,
       version: device.snmp_version,