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Calico + Istio App Layer Policy Setup - AI Agent Execution Guide

Target: AI code agents (Claude Code, GitHub Copilot Workspace, etc.) Audience: Automated execution systems Cluster Requirements: Kubernetes cluster with Calico CNI installed

Execution Prerequisites Check

Enforce Calico network policy for Istio service mesh

Overview

You can enforce Calico network policy for Istio application layer policy using the Dikastes sidecar. Dikastes enables Calico to integrate with Istio's Envoy proxy to enforce fine-grained Layer 7 (HTTP) policies.

Value

Pod traffic controls for Istio-enabled apps: Lets you restrict ingress traffic inside and outside pods and mitigate common threats to Istio-enabled apps.
Security alignment with zero trust: Supports zero-trust network models through traffic encryption, multiple enforcement points, and multiple identity criteria for authentication.

Calico + Istio 1.28 App Layer Policy - Step-by-Step Guide

This guide shows how to set up Calico Application Layer Policy (ALP) with Istio 1.28 using the modern IstioOperator approach.

Prerequisites

Kubernetes cluster (1.29+)
Calico 3.31.1 installed
Istio 1.28.1 installed
kubectl and istioctl CLI tools

Beast Mode

Beast Mode is a custom chat mode for VS Code agent that adds an opinionated workflow to the agent, including use of a todo list, extensive internet research capabilities, planning, tool usage instructions and more. Designed to be used with 4.1, although it will work with any model.

Below you will find the Beast Mode prompt in various versions - starting with the most recent - 3.1

Installation Instructions

Go to the "agent" dropdown in VS Code chat sidebar and select "Configure Modes".
Select "Create new custom chat mode file"

Calico Application Layer Policy via Helm

follow install steps here, EXCEPT the Install Istio part.
install istio-base via helm
- kubectl create ns istio-system
- helm install istio-base istio/base -n istio-system --wait
and then choose one of the below options (marked with OPTION)

	/* Functional Programming 101


	1.) Create a function 'last' that has the following use cases:

	- last("abc") // --> outputs "c"
	- last(1,2,3,"D") // --> outputs "D"
	- last([1,2,3,4]) // --> outputs 4

	<?php
	header("Cache-Control: no-cache, must-revalidate");
	header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");
	header("Content-type: application/json");

	require_once "app/Mage.php";

	Mage::app($_SERVER['MAGE_RUN_CODE'], $_SERVER['MAGE_RUN_TYPE']);

	$resource = Mage::getSingleton('core/resource');


	// Level 1 mission
	// The code does not execute properly. Try to figure out why.

	function multiply(a, b){
	a * b
	}

	// Level 2 mission
	//2. Correct this code, so that the greet function returns the expected value.

	// automatic creditcard detection @Seth Malaki `Electric Jesus` (c) 2012
	// returns credit type on success. returns null if either unsupported or fails checksum validation (Luhn algorithm).

	function getCreditCardType(accountNumber, doVerify)
	{
	var typeKey = null;
	// inspect account number, no dashes
	var creditCardInspectors = {
	VI : /^4\d{3}-?\d{4}-?\d{4}-?\d{4}$/, // Visa
	MC : /^5[1-5][0-9]{14}$/, // Mastercard

	# we're in the http context here
	map $http_upgrade $connection_upgrade {
	default upgrade;
	'' close;
	}

	# the Meteor / Node.js app server
	server {
	server_name yourdomain.com;