diff --git a/src/cosmosmesh_privacy_preserving_federated/energi_bridge.py b/src/cosmosmesh_privacy_preserving_federated/energi_bridge.py
index 1e2c139..beeaffe 100644
--- a/src/cosmosmesh_privacy_preserving_federated/energi_bridge.py
+++ b/src/cosmosmesh_privacy_preserving_federated/energi_bridge.py
@@ -1,7 +1,10 @@
 from __future__ import annotations
 
-from dataclasses import dataclass, asdict
-from typing import Dict, Any, List
+from dataclasses import dataclass
+from typing import Dict, Any, Optional, List
+
+# Reuse core CatOpt primitives for minimal compatibility in MVP
+from .catopt_bridge import LocalProblem, SharedVariable, DualVariable, PlanDelta
 
 
 @dataclass
@@ -13,7 +16,23 @@ class LocalProblemEP:
     data_contracts: Dict[str, Any]
 
     def to_dict(self) -> Dict[str, Any]:
-        return asdict(self)
+        return {
+            "problem_id": self.problem_id,
+            "assets": self.assets,
+            "objective": self.objective,
+            "constraints": self.constraints,
+            "data_contracts": self.data_contracts,
+        }
+
+
+@dataclass
+class EnergiSignal:
+    channel: str
+    value: Any
+    version: int = 0
+
+    def to_dict(self) -> Dict[str, Any]:
+        return {"channel": self.channel, "value": self.value, "version": self.version}
 
 
 @dataclass
@@ -21,71 +40,65 @@ class SharedVariableEP:
     channel: str
     version: int
     payload: Dict[str, Any]
-
     def to_dict(self) -> Dict[str, Any]:
         return {"channel": self.channel, "version": self.version, "payload": self.payload}
 
-
 @dataclass
 class DualVariableEP:
     channel: str
     version: int
     payload: Dict[str, Any]
-
     def to_dict(self) -> Dict[str, Any]:
         return {"channel": self.channel, "version": self.version, "payload": self.payload}
 
-
 @dataclass
 class PlanDeltaEP:
     delta_id: str
     changes: Dict[str, Any]
     timestamp: float
-
     def to_dict(self) -> Dict[str, Any]:
         return {"delta_id": self.delta_id, "changes": self.changes, "timestamp": self.timestamp}
 
 
 class EnergiBridge:
-    """Minimal EnergiBridge for cross-domain interoperability (MVP).
+    """Minimal EnergiBridge canonical bridge implementation.
 
-    Exposes a to_ir method that translates a local problem and its signals into
-    a canonical IR suitable for adapters in other domains.
+    Maps CosmosMesh primitives into a vendor-agnostic Intermediary Representation
+    suitable for cross-domain adapters.
     """
 
-    def __init__(self) -> None:
-        pass
+    def to_energi(
+        self,
+        lp: LocalProblemEP,
+        shared: List[SharedVariableEP],
+        duals: List[DualVariableEP],
+        deltas: Optional[List[PlanDeltaEP]] = None,
+    ) -> Dict[str, Any]:
+        data = {
+            "Version": "0.1",
+            "Objects": {
+                "LocalProblem": lp.to_dict(),
+            },
+            "Morphisms": [
+                {"Morphisms": {"SharedVariable": sv.to_dict()}} for sv in shared
+            ] + [
+                {"Morphisms": {"DualVariable": dv.to_dict()}} for dv in duals
+            ],
+        }
+        if deltas:
+            data["Objects"]["PlanDeltas"] = [p.to_dict() for p in deltas]
+        return data
 
+    # Backwards-compatible API expected by existing tests
     def to_ir(
         self,
         lp: LocalProblemEP,
         shared: List[SharedVariableEP],
         duals: List[DualVariableEP],
-        deltas: List[PlanDeltaEP],
+        deltas: Optional[List[PlanDeltaEP]] = None,
     ) -> Dict[str, Any]:
-        morphs = []
-        for s in shared:
-            morphs.append({"Morphisms": {"SharedVariable": s.channel, "version": s.version, "payload": s.payload}})
-        for d in duals:
-            morphs.append({"Morphisms": {"DualVariable": d.channel, "version": d.version, "payload": d.payload}})
+        return self.to_energi(lp, shared, duals, deltas)
 
-        # Lightweight per-round timing/provenance metadata aligned with the MVP"
-        time_monoid = {"round": 1, "timestamp": None}
-        metadata = {"generated_by": "EnergiBridge", "timestamp": None}
 
-        return {
-            "Version": "0.1",
-            "Objects": {
-                "LocalProblem": {
-                    "problem_id": lp.problem_id,
-                    "assets": lp.assets,
-                    "objective": lp.objective,
-                    "constraints": lp.constraints,
-                    "data_contracts": lp.data_contracts,
-                },
-                "PlanDeltas": [p.to_dict() for p in deltas],
-            },
-            "Morphisms": morphs,
-            "TimeMonoid": time_monoid,
-            "Metadata": metadata,
-        }
+
+__all__ = ["EnergiBridge", "EnergiLocalProblem", "EnergiSignal"]