diff --git a/flow360/component/simulation/design_intent.py b/flow360/component/simulation/design_intent.py
new file mode 100644
index 000000000..5d3da290b
--- /dev/null
+++ b/flow360/component/simulation/design_intent.py
@@ -0,0 +1,82 @@
+"""Data models for CAD design intent (feature tree) metadata."""
+
+from typing import Dict, List, Optional
+
+import pydantic as pd
+
+from flow360.component.simulation.framework.base_model import Flow360BaseModel
+
+
+class CADFeature(Flow360BaseModel):
+    """A single CAD feature (e.g., fillet, chamfer, extrusion) from the CAD feature tree."""
+
+    id: str = pd.Field(description="Deterministic UUID identifying this feature.")
+    name: str = pd.Field(description="Feature name as reported by the CAD kernel.")
+    cad_type: str = pd.Field(description="CAD feature type string (e.g., 'Fillet', 'Extrude').")
+    parent_id: str = pd.Field(
+        "", description="ID of the parent feature, or empty string for root features."
+    )
+    produced_entity_ids: List[str] = pd.Field(
+        [],
+        description="IDs of geometry entities (faces/edges) produced as the primary output of this feature.",
+    )
+    reference_entity_ids: List[str] = pd.Field(
+        [],
+        description="IDs of geometry entities used as construction or positioning references.",
+    )
+    support_entity_ids: List[str] = pd.Field(
+        [],
+        description="IDs of geometry entities used as support (e.g., faces selected for a fillet).",
+    )
+    properties: Dict[str, str] = pd.Field(
+        {},
+        description="Key-value pairs of feature parameters (e.g., radius, depth).",
+    )
+    child_feature_ids: List[str] = pd.Field(
+        [],
+        description="IDs of child features in the feature tree.",
+    )
+
+    def get_all_entity_ids(self) -> List[str]:
+        """Return the union of all entity IDs referenced by this feature."""
+        return list(
+            dict.fromkeys(
+                self.produced_entity_ids + self.reference_entity_ids + self.support_entity_ids
+            )
+        )
+
+
+class CADDesignIntent(Flow360BaseModel):
+    """Top-level container for CAD design intent extracted from the feature tree."""
+
+    version: str = pd.Field("0.1.0", frozen=True)
+    features: List[CADFeature] = pd.Field(
+        [], description="Flat list of all CAD features extracted from the model."
+    )
+
+    def get_feature_by_id(self, feature_id: str) -> Optional[CADFeature]:
+        """Return the feature with the given ID, or None if not found."""
+        for feature in self.features:
+            if feature.id == feature_id:
+                return feature
+        return None
+
+    def get_features_by_type(self, cad_type: str) -> List[CADFeature]:
+        """Return all features whose cad_type matches (case-insensitive)."""
+        lower = cad_type.lower()
+        return [f for f in self.features if f.cad_type.lower() == lower]
+
+    def get_producing_features(self, entity_id: str) -> List[CADFeature]:
+        """Return all features that produced the given entity ID."""
+        return [f for f in self.features if entity_id in f.produced_entity_ids]
+
+    def get_sibling_features(self, feature_id: str) -> List[CADFeature]:
+        """Return features that share the same parent as the given feature (excluding itself)."""
+        feature = self.get_feature_by_id(feature_id)
+        if feature is None:
+            return []
+        return [
+            f
+            for f in self.features
+            if f.parent_id == feature.parent_id and f.id != feature_id
+        ]
diff --git a/flow360/component/simulation/entity_info.py b/flow360/component/simulation/entity_info.py
index d90345cc0..39b073aa2 100644
--- a/flow360/component/simulation/entity_info.py
+++ b/flow360/component/simulation/entity_info.py
@@ -6,6 +6,7 @@
 
 import pydantic as pd
 
+from flow360.component.simulation.design_intent import CADDesignIntent
 from flow360.component.simulation.framework.base_model import Flow360BaseModel
 from flow360.component.simulation.framework.entity_registry import (
     EntityRegistry,
@@ -178,6 +179,12 @@ class GeometryEntityInfo(EntityInfoModel):
         description="The default value based on uploaded geometry for geometry_accuracy.",
     )
 
+    design_intent: Optional[CADDesignIntent] = pd.Field(
+        None,
+        description="CAD design intent (feature tree) extracted from a native CAD file. "
+        "Only populated when the geometry was imported from a format that exposes the feature tree.",
+    )
+
     @property
     def all_face_ids(self) -> list[str]:
         """