diff --git a/nova_plan/catopt_bridge.py b/nova_plan/catopt_bridge.py
index dad46d9..25dc6d1 100644
--- a/nova_plan/catopt_bridge.py
+++ b/nova_plan/catopt_bridge.py
@@ -73,7 +73,19 @@ def protocol_example(local: LocalProblem) -> str:
     return f"CatOpt Protocol Example: agent={obj.to_dict().get('agent_id')}"
 
 
-__all__ = ["Object", "Morphism", "Functor", "protocol_example"]
+__all__ = ["Object", "Morphism", "Functor", "protocol_example", "validate_contracts"]
+
+
+def validate_contracts(obj: Object, morphism: Morphism) -> bool:
+    """Validate basic contract compatibility between Object and Morphism.
+
+    Ensures that the delta keys carried by the Morphism are a subset of the
+    Object's local variables. This is a lightweight guard to catch obvious
+    contract mismatches early in the MVP bridge.
+    """
+    obj_vars = set(obj.to_dict().get("variables", {}).keys())
+    delta_keys = set(morphism.delta.keys())
+    return delta_keys.issubset(obj_vars)
 
 
 def to_object(local: LocalProblem) -> Object:
diff --git a/tests/test_catopt_bridge.py b/tests/test_catopt_bridge.py
index 036a456..745bfa2 100644
--- a/tests/test_catopt_bridge.py
+++ b/tests/test_catopt_bridge.py
@@ -2,7 +2,7 @@ import json
 import pytest
 
 from nova_plan.dsl import LocalProblemDSL
-from nova_plan.catopt_bridge import Object, Morphism, to_object, to_morphism, bridge_example
+from nova_plan.catopt_bridge import Object, Morphism, to_object, to_morphism, bridge_example, validate_contracts
 
 
 def test_local_problem_to_object_and_morphism_basic():
@@ -47,3 +47,20 @@ def test_bridge_example_integration():
     obj_payload = res["object"]
     assert obj_payload["agent_id"] == "habitat1"
     assert obj_payload["variables"] == {"a": 2.0}
+
+
+def test_validate_contracts_basic_and_negative():
+    dsl = LocalProblemDSL(
+        agent_id="rover1",
+        objective_expr='vars["x"]',
+        variables={"x": 1.0},
+        constraints={},
+    )
+    lp = dsl.to_local_problem()
+    obj = Object(lp)
+    morph = to_morphism(delta={"x": 0.5}, source="rover1", target="habitat")
+    assert validate_contracts(obj, morph) is True
+
+    # Mismatched delta key should fail
+    bad_morph = Morphism(delta={"y": 0.2}, source="rover1", target="habitat")
+    assert validate_contracts(obj, bad_morph) is False