From c402d0c79bfdaee463dc0fb595539633693038a4 Mon Sep 17 00:00:00 2001
From: Andre Perkins <frodre@gmail.com>
Date: Wed, 11 Feb 2026 16:23:51 -0800
Subject: [PATCH 1/2] Add validation entrypoint

---
 fme/downscaling/validate_config.py | 63 ++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 fme/downscaling/validate_config.py

diff --git a/fme/downscaling/validate_config.py b/fme/downscaling/validate_config.py
new file mode 100644
index 000000000..321c8ca27
--- /dev/null
+++ b/fme/downscaling/validate_config.py
@@ -0,0 +1,63 @@
+import argparse
+from typing import TypeVar
+
+import dacite
+import yaml
+
+from .evaluator import EvaluatorConfig
+from .inference import InferenceConfig
+from .predict import DownscalerConfig
+from .train import TrainerConfig
+
+T = TypeVar("T")
+
+CONFIG_CHOICES = ["train", "inference", "evaluator", "predict"]
+
+CONFIG_CLASSES: dict[str, type] = {
+    "train": TrainerConfig,
+    "inference": InferenceConfig,
+    "evaluator": EvaluatorConfig,
+    "predict": DownscalerConfig,
+}
+
+
+def validate_config(config_dict: dict, data_class: type[T]) -> T:
+    return dacite.from_dict(
+        data_class=data_class,
+        data=config_dict,
+        config=dacite.Config(strict=True),
+    )
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description="Validate a downscaling entrypoint config from a YAML file."
+    )
+    parser.add_argument(
+        "config_type",
+        type=str,
+        help=(
+            "Kind of configuration to validate. " f"Expected one of: {CONFIG_CHOICES}."
+        ),
+    )
+    parser.add_argument(
+        "config_file",
+        type=str,
+        help="Path to the configuration file (YAML).",
+    )
+    args = parser.parse_args()
+
+    if args.config_type not in CONFIG_CLASSES:
+        raise ValueError(
+            f"Unrecognized config type: '{args.config_type}'. "
+            f"Expected one of: {CONFIG_CHOICES}."
+        )
+
+    with open(args.config_file) as f:
+        config_dict = yaml.safe_load(f)
+
+    try:
+        validate_config(config_dict, CONFIG_CLASSES[args.config_type])
+        print("Configuration is valid.")
+    except dacite.DaciteError as e:
+        print(f"Configuration validation failed: {e}")

From 9344a08494707d69320def097be6c54e7f3dc0b1 Mon Sep 17 00:00:00 2001
From: Andre Perkins <frodre@gmail.com>
Date: Wed, 11 Feb 2026 16:26:54 -0800
Subject: [PATCH 2/2] Don't catch validation error

---
 fme/downscaling/validate_config.py | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fme/downscaling/validate_config.py b/fme/downscaling/validate_config.py
index 321c8ca27..6b4268feb 100644
--- a/fme/downscaling/validate_config.py
+++ b/fme/downscaling/validate_config.py
@@ -55,9 +55,5 @@ def validate_config(config_dict: dict, data_class: type[T]) -> T:
 
     with open(args.config_file) as f:
         config_dict = yaml.safe_load(f)
-
-    try:
         validate_config(config_dict, CONFIG_CLASSES[args.config_type])
         print("Configuration is valid.")
-    except dacite.DaciteError as e:
-        print(f"Configuration validation failed: {e}")