Custom Policy Development Reference

To develop a custom policy, you need a maven project having the following structure:

custom policy structure


  • pom.xml meets the following requirements:

    • groupId = organization Id.

    • packaging = mule-policy.

      This value is a Mule custom value for policies provided by the mule-maven-plugin, so this plugin has to be present in the pom also.

  • mule-artifact.json exists for the mule-maven-plugin. This is the same file you need for Mule applications.

  • my-custom-policy.yaml exists to render the policy configuration UI.

    If this file is not provided, the policy won’t be able to be applied through API Platform’s UI.

  • template.xml

    The template represents the actual logic of the policy and Mule configuration that defines the policy behavior.

POM Configuration Example

The minimum required POM configuration is:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns=""






mule-artifact.json Example

 "name": "my-custom-policy-template",
 "minMuleVersion": "4.0.0",
 "requiredProduct": "MULE_EE",
 "classLoaderModelLoaderDescriptor": {
   "id": "mule",
   "attributes": {}
 "bundleDescriptorLoader": {
   "id": "mule",
   "attributes": {
     "groupId": "bbd37829-003c-4f20-8888-3181b24e3384",
     "artifactId": "my-custom-policy",
     "version": "1.0.0-SNAPSHOT",
     "classifier": "mule-policy",
     "type": "jar"

my-custom-policy.yaml Example

id: my-custom-policy
name: My Custom Policy
supportedPoliciesVersions: '>=v1'
description: The custom policy description
category: Custom
type: syscustomtem
resourceLevelSupported: true
standalone: true
requiredCharacteristics: []
 - Some Characteristic
configuration: []