Warn for non-frontier LLM selections

tests/test_models.py

@@ -0,0 +1,40 @@
+"""Tests for LLM model recommendation helpers."""
+
+from __future__ import annotations
+
+import pytest
+
+from strix.config.models import RECOMMENDED_MODEL_NAMES, is_recommended_or_frontier_model
+
+
+@pytest.mark.parametrize("model_name", RECOMMENDED_MODEL_NAMES)
+def test_recommended_models_are_accepted(model_name: str) -> None:
+    assert is_recommended_or_frontier_model(model_name)
+
+
+@pytest.mark.parametrize(
+    "model_name",
+    [
+        "gpt-5.4",
+        "litellm/openai/gpt-5.4",
+        "anthropic/claude-opus-4-1",
+        "any-llm/anthropic/claude-sonnet-4-6",
+        "vertex_ai/gemini-3-pro-preview",
+    ],
+)
+def test_frontier_model_families_are_accepted(model_name: str) -> None:
+    assert is_recommended_or_frontier_model(model_name)
+
+
+@pytest.mark.parametrize(
+    "model_name",
+    [
+        "",
+        "openai/gpt-4.1",
+        "anthropic/claude-3-5-sonnet-latest",
+        "ollama/llama3.1",
+        "deepseek/deepseek-chat",
+    ],
+)
+def test_non_frontier_models_are_rejected(model_name: str) -> None:
+    assert not is_recommended_or_frontier_model(model_name)