Add Make/Just/Task migration guides; fix two Atmos config bugs

agent-skills/AGENTS.md

@@ -141,7 +141,7 @@ When a task involves Atmos, activate the matching skill for detailed guidance.
 | AWS ECR: registry login, ECR auth integrations, Docker credential writes                                          | `atmos-aws-ecr`         | `agent-skills/skills/atmos-aws-ecr/SKILL.md`         |
 | AWS compliance: Security Hub standards, compliance reports, CIS AWS, PCI DSS, SOC2, HIPAA, NIST                   | `atmos-aws-compliance`  | `agent-skills/skills/atmos-aws-compliance/SKILL.md`  |
 | AWS security: analyze findings, map to components/stacks, structured remediation                                  | `atmos-aws-security`    | `agent-skills/skills/atmos-aws-security/SKILL.md`    |
-| Migrating to Atmos from native Terraform/OpenTofu, Terraform Workspaces, or Terramate: layout, workspace mapping, remote-state bridge, generate_hcl/script decomposition | `atmos-migration`       | `agent-skills/skills/atmos-migration/SKILL.md`       |
+| Migrating to Atmos from Terraform, Terraform Workspaces, Terramate, or a task runner (Make, Just, or Task): layout, workspace mapping, remote-state bridge, task-to-command mapping, generate_hcl/script decomposition | `atmos-migration`       | `agent-skills/skills/atmos-migration/SKILL.md`       |
 | Atmos Modernization: replace deprecated patterns with current Atmos naming, CI, Pro, auth, secrets, and dependencies | `atmos-modernization`   | `agent-skills/skills/atmos-modernization/SKILL.md`   |
 
 ## Common Patterns

agent-skills/skills/atmos-introspection/SKILL.md

@@ -312,12 +312,15 @@ atmos terraform plan --help=usage      # ONLY the usage line + embedded usage ex
                                         # the fastest way to see real invocation examples
 atmos terraform plan --help=flags      # Command-specific flags only, excludes inherited/global flags
 atmos terraform plan --help=all        # Full reference: everything, including inherited/global flags
+atmos wrapper --help=hidden            # ONLY wrapper's hidden subcommands (internal: true custom
+                                        # commands, or hidden built-ins) -- omitted from every other topic
 ```
 
 Prefer `--help=usage` over the default `--help` when you just need to confirm how a command is invoked --
 it skips straight to worked examples instead of the full flag listing. Reach for `--help=all` only when you
 need the complete inherited-flag surface (e.g. global `--stack`/`--format`/logging flags shared across
-commands).
+commands). Reach for `--help=hidden` when a command's default action or steps reference a subcommand name
+that never shows up in `--help` -- it is almost certainly an `internal: true` custom command, not a typo.
 
 ## Introspection Workflow for AI Agents
 

agent-skills/skills/atmos-migration/references/from-justfile.md

@@ -0,0 +1,196 @@
+# Migrating from Justfiles
+
+This guide shows how to move Just recipes to Atmos. Find the correct shape for the Justfile
+below. Then follow the matching steps. For the full tutorial, see
+[atmos.tools/migration/justfile](https://atmos.tools/migration/justfile).
+
+Just recipe bodies do not require tab indentation, unlike Make. Just's named parameters with
+default values map closely to Atmos custom command `flags:` and `arguments:`. This is the
+closest match of the three task runners this skill covers. If the Justfile also selects a
+Terraform environment, also use [from-native-terraform.md](from-native-terraform.md) for the
+Terraform-specific steps.
+
+## Find the Shape of the Justfile
+
+| Shape                                                              | Steps                          |
+|-----------------------------------------------------------------------|-----------------------------------|
+| Recipes with named parameters and default values                      | [Shape A](#shape-a-recipes-with-named-parameters) |
+| Recipe dependencies (`build: test`)                                    | [Shape B](#shape-b-recipe-dependencies) |
+| `set dotenv-load`, `export VAR := ...`, `set shell := [...]`           | [Shape C](#shape-c-environment-and-shell-settings) |
+
+## Shape A: Recipes with Named Parameters
+
+**Before:**
+```just
+# Build the deployable artifact
+build:
+    go build -o bin/handler ./cmd/handler
+
+# Run static analysis
+lint:
+    golangci-lint run ./...
+
+[private]
+_clean:
+    rm -rf bin/
+```
+
+**Steps:**
+
+1. Turn the `# comment` above a recipe into the command's `description:` field. Atmos shows this
+    text in `atmos --help` and `atmos <command> --help`. This replaces `just --list`.
+2. Turn a recipe's named parameter with a default value, such as `deploy env='dev':`, into a
+    command `flags:` entry with a matching `default:` value. Inside a step, read the value as
+    `{{ .Flags.env }}`. Do not use Just's own `{{env}}` syntax. See
+    [Common Problems](#--interpolation-looks-like-atmos-templates-but-is-not) below.
+3. Set `internal: true` on a command created from a `[private]` recipe. It runs normally
+    (`atmos <name> ...`, as a `default:` target, or from another command's steps) but is excluded
+    from `atmos --help` listings and completion suggestions. Only inline the recipe's body into a
+    caller's step when it is genuinely single-caller logic with no reason to be invoked on its own.
+
+```yaml
+commands:
+  - name: build
+    description: Build the deployable artifact
+    steps:
+      - type: shell
+        command: go build -o bin/handler ./cmd/handler
+
+  - name: lint
+    description: Run static analysis
+    steps:
+      - type: shell
+        command: golangci-lint run ./...
+```
+
+## Shape B: Recipe Dependencies
+
+**Before:**
+```just
+# Run tests (builds first)
+test: build
+    go test ./...
+
+# Deploy to the given environment (defaults to dev)
+deploy env='dev': build test
+    cd terraform && terraform apply -var-file=envs/{{env}}.tfvars
+```
+
+**Steps:** use the same method as Make's dependency chains. See
+[from-makefile.md Shape B](from-makefile.md#shape-b-target-chains-with-dependencies). Use a
+`type: atmos` step with `command: build` to call another custom command -- `type: atmos` preserves
+step-level stack context and structured output handling, which a `type: shell` step running
+`atmos build` does not.
+
+```yaml
+commands:
+  - name: test
+    description: Run tests (builds first)
+    steps:
+      - type: atmos
+        command: build
+      - type: shell
+        command: go test ./...
+
+  - name: deploy
+    description: Deploy to the given environment (defaults to dev)
+    flags:
+      - name: env
+        shorthand: e
+        default: "dev"
+    steps:
+      - type: atmos
+        command: test
+      - type: atmos
+        command: terraform apply infra -s {{ .Flags.env }}
+```
+
+`infra` is a placeholder Atmos component name, not the `terraform` verb repeated. Move the
+recipe's Terraform code to `components/terraform/infra/` (the default
+`components.terraform.base_path` is `components/terraform`), then swap `infra` for whatever the
+user actually names the component.
+
+## Shape C: Environment and Shell Settings
+
+**Before:**
+```just
+set dotenv-load := true
+set shell := ["bash", "-uc"]
+
+export AWS_REGION := "us-east-1"
+```
+
+**Steps:**
+
+- Turn `export VAR := value` into a command or step `env:` map.
+- `set dotenv-load` maps to `env: !include .env` on the command, workflow, or step. Atmos parses
+  the dotenv file natively (including `export VAR=value`, comments, quoting, and `${VAR}`
+  expansion) and merges the result into `env:`. If the values are secrets rather than plain
+  config, use Atmos's store or secrets integration instead of a plaintext `.env` file.
+- `set shell := [...]` changes the shell for every recipe in the Justfile. Atmos has no matching
+  command-level setting. Use `type: script` with an explicit `interpreter:` field on the one step
+  that needs a different interpreter.
+
+```yaml
+commands:
+  - name: build
+    description: Build the deployable artifact
+    env:
+      <<: !include .env
+      AWS_REGION: us-east-1
+    steps:
+      - type: shell
+        command: go build -o bin/handler ./cmd/handler
+```
+
+## Common Problems
+
+### `{{ }}` interpolation looks like Atmos templates but is not
+
+Just's `{{ var }}` syntax and Atmos's `{{ .Flags.var }}` syntax both use Go templates, but they
+run in different tools at different times. Do not copy Just interpolation syntax into Atmos
+YAML. Change each reference to the matching `{{ .Flags.<name> }}` or
+`{{ .Arguments.<name> }}` form.
+
+### `[private]` recipes map to `internal: true`
+
+The custom command schema has an `internal: true` field. It excludes the command from `atmos --help`
+listings and completion suggestions while leaving it fully runnable -- directly, as a `default:`
+target, or from another command's steps. This is the direct equivalent of a `[private]` recipe,
+and it covers cases plain step-inlining cannot: a helper called from more than one recipe, or one
+a user invokes by name for manual debugging.
+
+Only inline a `[private]` recipe's logic into a caller's step when it is genuinely single-caller
+and has no reason to be invoked on its own -- in that case a separate `internal` command is just
+unnecessary indirection.
+
+If a `[private]` recipe is never called by any public recipe (an orphaned helper, not a
+dependency), `internal: true` no longer forces the same discovery you'd get from step-inlining --
+it would just as quietly hide dead code as reachable helper code. Confirm with the user whether
+the recipe is still needed at all before migrating it; if it is, ask whether it should become a
+`internal` command, a step inside whichever command ends up needing it, or a short script the user
+maintains separately.
+
+### Command echo differs between `just` and Atmos
+
+By default, Just prints each recipe line before running it (`sh -x`-style), so `just build`'s
+visible output includes every command line, not just what those commands print. Atmos `type:
+shell` steps run silently by default -- only the command's own stdout/stderr shows. The migrated
+command's side effects match the original recipe, but the terminal output will look sparser side
+by side. Tell the user this if they compare `just <recipe>` output to `atmos <command>` output
+directly; it is a visible difference, not a bug.
+
+### Confirm `set shell` with the user; `dotenv-load` has a direct replacement
+
+`set dotenv-load` maps directly to `env: !include .env` -- no confirmation needed unless the
+`.env` file holds secrets, in which case ask whether to use Atmos's store or secrets integration
+instead. `set shell` has no command-level equivalent; ask the user if a non-default shell matters
+to their workflow, then apply `type: script` with `interpreter:` to the specific steps that need
+it.
+
+## What Not To Do
+
+- Do not assume `{{ }}` means the same thing after you move it into Atmos YAML.
+- Do not invent a visibility value beyond the documented `internal: true` boolean (no "public"/"private" enum, no partial visibility).
+- Do not drop `set shell` behavior without telling the user; `dotenv-load` maps directly to
+  `env: !include .env`, so it does not need the same case-by-case confirmation.