---
title: "Agent Skill to Terraform Azurerm Set Diff Analyzer"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/skill-terraform-azurerm-set-diff-analyzer"
modality: "SKILL"
category: "DevOps & Cloud"
compatible_models: [Universal / Model Agnostic]
access_tier: "Free Public Artifact (No Auth Required)"
license: "MIT"
---

# Agent Skill to Terraform Azurerm Set Diff Analyzer

**Summary:** Agent Skill to Terraform Azurerm Set Diff Analyzer is a verified SKILL blueprint on Promptally in DevOps & Cloud optimized for leading AI models. Analyze Terraform plan JSON output for AzureRM Provider to distinguish between false-positive diffs (order-only changes in Set-type attributes) and actual resource changes. Use when reviewing terraform plan output for Azure resources like Application Gateway, Load Balancer, Firewall, Front Door, NSG, and other resources with Set-type attributes that cause spurious diffs due to internal ordering changes. Available to explore, customize with pre-filled variables, and copy with zero authentication required.

## Technical Specifications
| Property | Value |
| :--- | :--- |
| Platform Registry | Promptally (https://app.promptally.dev) |
| Modality | SKILL |
| Category | DevOps & Cloud |
| Compatible Engines | Universal / Model Agnostic |
| Dynamic Variables | None (Static Blueprint) |
| Approx. Token Length | 547 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

````md
---
name: terraform-azurerm-set-diff-analyzer
description: Analyze Terraform plan JSON output for AzureRM Provider to distinguish between false-positive diffs (order-only changes in Set-type attributes) and actual resource changes. Use when reviewing terraform plan output for Azure resources like Application Gateway, Load Balancer, Firewall, Front Door, NSG, and other resources with Set-type attributes that cause spurious diffs due to internal ordering changes.
license: MIT
---

# Terraform AzureRM Set Diff Analyzer

A skill to identify "false-positive diffs" in Terraform plans caused by AzureRM Provider's Set-type attributes and distinguish them from actual changes.

## When to Use

- `terraform plan` shows many changes, but you only added/removed a single element
- Application Gateway, Load Balancer, NSG, etc. show "all elements changed"
- You want to automatically filter false-positive diffs in CI/CD

## Background

Terraform's Set type compares by position rather than by key, so when adding or removing elements, all elements appear as "changed". This is a general Terraform issue, but it's particularly noticeable with AzureRM resources that heavily use Set-type attributes like Application Gateway, Load Balancer, and NSG.

These "false-positive diffs" don't actually affect the resources, but they make reviewing terraform plan output difficult.

## Prerequisites

- Python 3.8+

If Python is unavailable, install via your package manager (e.g., `apt install python3`, `brew install python3`) or from [python.org](https://www.python.org/downloads/).

## Basic Usage

```bash
# 1. Generate plan JSON output
terraform plan -out=plan.tfplan
terraform show -json plan.tfplan > plan.json

# 2. Analyze
python scripts/analyze_plan.py plan.json
```

## Troubleshooting

- **`python: command not found`**: Use `python3` instead, or install Python
- **`ModuleNotFoundError`**: Script uses only standard library; ensure Python 3.8+

## Detailed Documentation

- [scripts/README.md](scripts/README.md) - All options, output formats, exit codes, CI/CD examples
- [references/azurerm_set_attributes.md](references/azurerm_set_attributes.md) - Supported resources and attributes

````

## Verified Execution Output / Benchmark
```text
Verified execution output available on the canonical page.
```

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