diff --git a/colibri/closure_test.py b/colibri/closure_test.py
index f7b488ba7..f27fc8fb5 100644
--- a/colibri/closure_test.py
+++ b/colibri/closure_test.py
@@ -73,7 +73,7 @@ def closure_test_colibri_model_pdf(closure_test_model_settings, FIT_XGRID):
 
     # Compute the pdf grid
     pdf_grid_func = pdf_model.grid_values_func(FIT_XGRID)
-    params = jnp.array(closure_test_model_settings["parameters"])
+    params = jnp.array(list(closure_test_model_settings["parameters"].values()))
     pdf_grid = pdf_grid_func(params)
 
     return pdf_grid
diff --git a/colibri/config.py b/colibri/config.py
index d3495c770..dc3bf29e4 100644
--- a/colibri/config.py
+++ b/colibri/config.py
@@ -521,3 +521,20 @@ def produce_pdf_model(self):
         Returns None as the pdf_model is not used in the colibri module.
         """
         return None
+
+    def parse_closure_test_colibri_model_pdf(self, settings):
+        """
+        Validates that required keys are present and returns the full settings dictionary.
+        Requires: 'model' and 'parameters'.
+        Other keys (e.g. 'fitted_flavours') are allowed and passed through.
+        """
+        required_keys = {"model", "parameters"}
+
+        missing_keys = required_keys - settings.keys()
+        if missing_keys:
+            raise KeyError(
+                f"Missing required key(s) in closure_test_model_settings: {', '.join(missing_keys)}"
+            )
+
+        # Return a full copy of the settings dictionary (assuming it’s valid)
+        return dict(settings)
diff --git a/colibri/tests/test_closure_test.py b/colibri/tests/test_closure_test.py
index 2ae90a690..8d67398fb 100644
--- a/colibri/tests/test_closure_test.py
+++ b/colibri/tests/test_closure_test.py
@@ -76,7 +76,10 @@ def test_closure_test_pdf_grid_with_colibri_model(
     # Mock the pdf model
     mock_pdf_model_from_colibri_model.return_value = mock_colibri_model
 
-    settings = {"parameters": [1, 2, 3], "model": "test_model"}
+    settings = {
+        "parameters": {"param1": 1, "param2": 2, "param3": 3},
+        "model": "test_model",
+    }
 
     grid = closure_test_pdf_grid(
         "colibri_model", sample_xgrid, closure_test_model_settings=settings
@@ -109,7 +112,10 @@ def test_closure_test_colibri_model_pdf(
     # Mock the pdf model
     mock_pdf_model_from_colibri_model.return_value = mock_colibri_model
 
-    settings = {"parameters": [1, 2, 3], "model": "test_model"}
+    settings = {
+        "parameters": {"param1": 1, "param2": 2, "param3": 3},
+        "model": "test_model",
+    }
 
     pdf_grid = closure_test_colibri_model_pdf(settings, sample_xgrid)
     assert pdf_grid.shape == (3, 5)
diff --git a/colibri/tests/test_config.py b/colibri/tests/test_config.py
index 790be2b5c..9f415141b 100644
--- a/colibri/tests/test_config.py
+++ b/colibri/tests/test_config.py
@@ -418,3 +418,43 @@ def test_produce_commondata_tuple():
     closure_test_level = 2
     with pytest.raises(ConfigError):
         BASE_CONFIG.produce_commondata_tuple(closure_test_level)
+
+
+@patch("colibri.config.log.warning")
+def test_parse_closure_test_colibri_model_pdf(mock_warning):
+    # Mock the pdf model
+    settings = {
+        "parameters": {"param1": 1, "param2": 2},
+        "model": "test_model",
+        "fitted_flavours": ["T3", "T8"],
+    }
+
+    # Call the method
+    result = BASE_CONFIG.parse_closure_test_colibri_model_pdf(settings)
+
+    # Assert the result is as expected
+    expected = {
+        "parameters": {"param1": 1, "param2": 2},
+        "model": "test_model",
+        "fitted_flavours": ["T3", "T8"],
+    }
+
+    assert result == expected
+
+    # Check that error is raised if a necessary key is missing
+
+    settings_no_model = {
+        "parameters": {"param1": 1},
+        "fitted_flavours": ["T3"],
+    }
+
+    with pytest.raises(KeyError, match="Missing required key.*model"):
+        BASE_CONFIG.parse_closure_test_colibri_model_pdf(settings_no_model)
+
+    settings_no_parameters = {
+        "model": "test_model",
+        "fitted_flavours": ["T3"],
+    }
+
+    with pytest.raises(KeyError, match="Missing required key.*parameters"):
+        BASE_CONFIG.parse_closure_test_colibri_model_pdf(settings_no_parameters)