diff --git a/ecs/states-inventory-packages/fields/custom/agent.yml b/ecs/states-inventory-packages/fields/custom/agent.yml
new file mode 100644
index 0000000000000..3482123af637a
--- /dev/null
+++ b/ecs/states-inventory-packages/fields/custom/agent.yml
@@ -0,0 +1,12 @@
+---
+- name: agent
+  title: Wazuh Agents
+  short: Wazuh Inc. custom fields.
+  type: group
+  group: 2
+  fields:
+    - name: groups
+      type: keyword
+      level: custom
+      description: >
+        The groups the agent belongs to.