Add project tools and strict provider execution

tests/test_tool.py

@@ -105,6 +105,25 @@ class TestToolArgument:
         with pytest.raises(ValueError):
             ToolArgument(flag="--value", variable="value", **values)
 
+    @pytest.mark.parametrize(
+        ("legacy_type", "canonical_type"),
+        [
+            ("str", "string"),
+            ("int", "integer"),
+            ("float", "number"),
+            ("bool", "boolean"),
+        ],
+    )
+    def test_legacy_scalar_type_aliases_are_normalized(
+        self, legacy_type, canonical_type
+    ):
+        argument = ToolArgument(
+            flag="--value", variable="value", type=legacy_type
+        )
+
+        assert argument.type == canonical_type
+        assert argument.to_dict().get("type", "string") == canonical_type
+
 
 class TestPromptStep:
     """Tests for PromptStep dataclass."""
@@ -686,6 +705,23 @@ class TestAgentContext:
         restored = PromptStep.from_dict(step.to_dict())
         assert restored.skills == ["python"]
 
+    def test_promptstep_deny_fallback_roundtrip(self):
+        step = PromptStep(
+            prompt="Private", provider="local", output_var="out",
+            fallback_policy="deny",
+        )
+
+        restored = PromptStep.from_dict(step.to_dict())
+
+        assert restored.fallback_policy == "deny"
+
+    def test_promptstep_rejects_invalid_fallback_policy(self):
+        with pytest.raises(ValueError, match="fallback_policy"):
+            PromptStep(
+                prompt="Test", provider="local", output_var="out",
+                fallback_policy="sometimes",
+            )
+
 
 class TestDeprecationFields:
     def test_round_trip_and_warning(self):