# atmos stack validate

Validate all stack manifest configurations against the atmos-manifest JSON Schema —
the same one [`atmos stack schema`](/cli/commands/stack/stack-schema) prints. This is
an alias for [`atmos validate stacks`](/cli/commands/validate/stacks).

## Usage

```shell
atmos stack validate
```

## Examples

```shell
# Validate all stack manifests.
atmos stack validate

# Equivalent long form.
atmos validate stacks

# Validate against a custom schema.
atmos stack validate --schemas-atmos-manifest schemas/atmos-manifest.json

# Skip validation when no stack or Atmos configuration inputs changed.
atmos stack validate --affected --base origin/main
atmos stack validate --exclude 'stacks/experimental/**'
```

`--affected` resolves the Git merge-base automatically on GitHub Actions. A
relevant stack or Atmos configuration change runs the complete stack validation,
so imports and duplicate-component checks remain correct; unrelated changes are
skipped. Use `--base` to select a local comparison point.

Use repeatable `--exclude <glob>` to omit stack manifests from full or affected validation.

## Flags

- **`--schemas-atmos-manifest` (optional)**
  Path or URL of a JSON Schema to validate stack manifests against, overriding the embedded schema and any 
  `schemas.atmos.manifest`
   setting.
- **`--affected` (optional)**
  Validate only when stack or Atmos configuration inputs changed since the Git merge-base.
- **`--base` (optional)**
  Git ref or SHA used as the comparison baseline for 
  \--affected
  .