# `AshPhoenixGenApi.Verifiers.VerifyActionConfigs`
[🔗](https://github.com/ohhi-vn/ash_phoenix_gen_api/blob/v1.0.3/lib/ash_phoenix_gen_api/verifiers/verify_action_configs.ex#L1)

Verifier for the `gen_api` section of `AshPhoenixGenApi.Resource`.

This verifier performs compile-time validation of the PhoenixGenApi action
configurations defined in an Ash resource's DSL. It checks:

1. **Action existence** — Every `action` entity references an Ash action
   that actually exists on the resource.

2. **Request type uniqueness** — No two actions in the same resource
   share the same `request_type` (either explicit or auto-derived).

3. **Arg consistency** — When both `arg_types` and `arg_orders` are
   explicitly provided, their keys must match exactly.

4. **Permission arg existence** — When `check_permission` is set to
   `{:arg, "arg_name"}`, the argument must exist in either the explicit
   `arg_types` or the Ash action's accepted attributes/arguments.

5. **MFA validity** — When an explicit `mfa` is provided, the module
   must be loaded (or the function must exist if the module is loaded).

6. **Permission callback validity** — When `permission_callback` is
   provided, it must be a valid MFA tuple `{module, function, args}`
   where module and function are atoms and args is a list, or `nil`.

## Error Messages

The verifier raises `Spark.Error.DslError` with descriptive messages
and the path to the offending configuration, making it easy to locate
and fix issues.

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*Consult [api-reference.md](api-reference.md) for complete listing*