# Terragrunt 0 99

> Apply Terragrunt 0.99 HCL, CLI, orchestration, migration, and behaviour changes. Load for Terragrunt work targeting 0.99 or later when the model's knowledge may predate the 2026-01-26 release.

- Skill: `cedws/terragrunt-0-99` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add cedws/terragrunt-0-99`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cedws/terragrunt-0-99/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: cedws (https://skillmd.com/u/cedws)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cedws/terragrunt-0-99

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# Terragrunt 0.99

This overview applies to target Terragrunt versions of at least 0.99.

## TFLint migration

Breaking change: Terragrunt's frozen, embedded TFLint became deprecated. External TFLint is the supported direction. The `legacy-internal-tflint` strict control opts into the future behaviour, while `--terragrunt-external-tflint` in a TFLint hook selects an installed external binary and is stripped before invocation.

## Graph depth and reports

Graph filters accept numeric traversal limits: `service...1` selects one dependency level, `1...vpc` one dependant level, and `1...db...2` combines both directions.

Run reports gained `Ref`, `Cmd`, and `Args` fields for Git-worktree and delegated OpenTofu or Terraform execution details.

## Experimental engines

Experimental and breaking within the experiment: IaC engines moved to `terragrunt-engine-go` 0.1.0 with no compatibility promise for earlier engines. The OpenTofu engine therefore needs its 0.1.0 protocol version.