terraform-stack

A standard workflow for Terraform or OpenTofu, tools that describe and manage cloud infrastructure with configuration files. It uses OpenTofu as the default engine and includes formatting, validation, linting, security scans, tests, and documentation.

In plain words
What is it for?
It is for installing the infrastructure toolchain, formatting and validating configuration, running tflint and Trivy scans, executing native tests, building plans, and generating documentation.
Why use it?
It provides consistent checks for infrastructure code before it is built or applied, including checks for configuration mistakes and security problems.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/fmind/dotfiles/terraform-stack
Any agent
npx skills add fmind/dotfiles --skill terraform-stack
Clone the repo
git clone --depth 1 https://github.com/fmind/dotfiles

Made for: Claude Code, Codex.

Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,000 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00045 $0.02000
Opus 5 $0.00023 $0.01000
Sonnet 5 $0.00009 $0.00400
Haiku 4.5 $0.00005 $0.00200

Measured yesterday against content hash 57aec3a02ed9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

terraform-stack scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/terraform-stack/SKILL.md · 68 lines

How it starts

The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Terraform / OpenTofu Stack Standard (OpenTofu 1.12+)

Canonical guidelines for infrastructure as code with OpenTofu (the open-source Terraform fork and default engine — the CLI binary is tofu). Reserve HashiCorp terraform for repositories that require a BSL-licensed feature or an employer mandate, and mention the deviation.

1. Core Stack

  • Engine: OpenTofu 1.12+ via mise (opentofu tool, tofu binary). Every terraform {} block and .tf file works unchanged; OpenTofu adds client-side state encryption on top.
  • Task Runner & Hooks: mise.toml (mise.toml) exposes the canonical vocabulary per the mise skillinstall (init + tflint rulesets + hooks), format (tofu fmt + dprint), check (fans out below), test (tofu test), build (plan artifact), build:docs (terraform-docs). lefthook.yml (lefthook.yml) wires pre-commit (format → leaks → check) and pre-push (test) per the lefthook skill.
  • Check Fan-Out (all static, parallel, cloud-free): check:format (tofu fmt -check + dprint), check:validate (tofu validate), check:lint (tflint --recursive with the pinned rulesets in tflint.hcl), check:scan (trivy config for misconfigurations, per the vocabulary in the mise skill), check:leaks (gitleaks).
  • Docs: terraform-docs injects the module's inputs/outputs table into README.md between <!-- BEGIN_TF_DOCS --> / <!-- END_TF_DOCS --> markers, configured by terraform-docs.yml.
  • Apply Is Manual: build produces tmp/plan.tfplan; applying it is a deliberate human step (tofu apply tmp/plan.tfplan), never a task or hook — plans mutate infrastructure and money.

2. Project Scaffolding Workflow

  1. Information: Define the project Slug, GCP Project ID, and default Region.
  2. Config Initialization: Copy and customize:
  3. Scaffold Sources (flat root module — no modules/ tree until a unit is reused):
    • versions.tf (versions.tf) — version constraints, provider pins, and the commented GCS backend + encryption blocks.
    • main.tf (main.tf), variables.tf (variables.tf) (typed, validated inputs), outputs.tf (outputs.tf).
    • terraform.example.tfvars (terraform.example.tfvars) — non-secret example and static-scan values; replace the project ID before planning.
    • tests/main.tftest.hcl (main.tftest.hcl) — plan-only native tests.
  4. Git & Validation: git init --initial-branch=main, then mise run install, format, check, test — all green without any cloud access, because the backend ships commented and tests run in plan mode. Commit .terraform.lock.hcl (provider pins); on multi-platform teams run tofu providers lock -platform=linux_amd64 -platform=darwin_arm64 so the lockfile carries hashes for both.
  5. Backend Promotion: Once real state exists, create the versioned GCS bucket (commands inline in versions.tf), uncomment the backend "gcs" block, and re-run mise run installtofu init migrates local state after an explicit prompt.

Read the full file on GitHub · 68 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 68 lines · 45 tokens per session scan A 57aec3a02ed9

Subscribe to this mod's changes

terraform-stack is a skill published in the GitHub repository fmind/dotfiles (4 stars, last pushed 2d ago), licensed MIT. It adds 45 tokens to every session and 2,000 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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