diff --git a/config/config.exs b/config/config.exs
index e6ec3a52..a6e8a40e 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -22,6 +22,11 @@ config :logger, :default_formatter,
   format: "$time $metadata[$level] $message\n",
   metadata: [:request_id]
 
+# Register protobuf MIME type for agent API
+config :mime, :types, %{
+  "application/x-protobuf" => ["protobuf"]
+}
+
 # Filter sensitive parameters from logs
 config :phoenix, :filter_parameters, ["password", "snmp_community", "secret", "token", "api_key"]
 
diff --git a/lib/towerops_web/router.ex b/lib/towerops_web/router.ex
index 6091da7c..2f7889ed 100644
--- a/lib/towerops_web/router.ex
+++ b/lib/towerops_web/router.ex
@@ -19,7 +19,7 @@ defmodule ToweropsWeb.Router do
   end
 
   pipeline :agent_api do
-    plug :accepts, ["json"]
+    plug :accepts, ["json", "protobuf"]
     plug ToweropsWeb.Plugs.AgentAuth
   end