Terraform Azurerm Set Diff Analyzer
github/awesome-copilotOfficial
The terraform-azurerm-set-diff-analyzer skill identifies false-positive diffs in Terraform plans for Azure resources caused by Set-type attribute reordering, helping infrastructure engineers distinguish spurious changes from actual modifications. It solves the problem where adding or removing a single element in resources like Application Gateways, Load Balancers, and NSGs causes Terraform to report all elements as changed, making plan reviews difficult and error-prone. The skill uses Python to analyze Terraform plan JSON output and filter out order-only changes while preserving genuine resource modifications.
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- GitHub stars
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- last updated
- Aug 21, 2026
Install
$ npx -y skills add github/awesome-copilot --skill terraform-azurerm-set-diff-analyzer --agent claude-codeInstalls into .claude/skills of the current project.
Files
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 planshows 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.
Basic Usage
# 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: Usepython3instead, or install PythonModuleNotFoundError: Script uses only standard library; ensure Python 3.8+
Detailed Documentation
- scripts/README.md - All options, output formats, exit codes, CI/CD examples
- references/azurerm_set_attributes.md - Supported resources and attributes
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