diff --git a/README.md b/README.md
index 0bbf313..0d31e1a 100644
--- a/README.md
+++ b/README.md
@@ -8,3 +8,8 @@ A minimal MVP scaffold for PulseMesh Open Telemetry Visualization A.
 
 This repository is structured to be Python-package friendly. The packaging config in pyproject.toml targets a standard
 PEP 517 build flow using setuptools. A minimal test suite and a tiny package scaffold are included to satisfy CI gates.
+
+Phase 0 MVP: Protocol Skeleton
+- Introduced a lightweight protocol module (protocol.py) that defines TelemetryContract and DeltaEnvelope wrappers for deltas.
+- Provides wrap_delta(delta, contract, protocol_version) to compose envelope messages for contract-driven delta transmission.
+- Exposes TelemetryContract, DeltaEnvelope, and wrap_delta via the package root for experimentation and future adapters.
diff --git a/src/pulsemesh_open_telemetry_visualization_a/__init__.py b/src/pulsemesh_open_telemetry_visualization_a/__init__.py
index 15882b2..b0174e7 100644
--- a/src/pulsemesh_open_telemetry_visualization_a/__init__.py
+++ b/src/pulsemesh_open_telemetry_visualization_a/__init__.py
@@ -3,5 +3,7 @@ PulseMesh Open Telemetry Visualization A - minimal package scaffold.
 This file exists to satisfy packaging/build in the MVP.
 """
 
-__all__ = ["__version__"]
+from .protocol import TelemetryContract, DeltaEnvelope, wrap_delta
+
+__all__ = ["__version__", "TelemetryContract", "DeltaEnvelope", "wrap_delta"]
 __version__ = "0.1.0"
diff --git a/src/pulsemesh_open_telemetry_visualization_a/protocol.py b/src/pulsemesh_open_telemetry_visualization_a/protocol.py
new file mode 100644
index 0000000..14194bf
--- /dev/null
+++ b/src/pulsemesh_open_telemetry_visualization_a/protocol.py
@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, asdict
+from typing import List, Dict, Any
+import json
+
+from .delta import Delta
+from .telemetry import TelemetrySample
+
+
+@dataclass
+class TelemetryContract:
+    contract_id: str
+    device_type: str
+    metrics: List[str]
+    units: Dict[str, str]  # metric -> unit
+    quality_flags: List[str]
+    version: int
+
+    def to_dict(self) -> Dict[str, Any]:
+        return asdict(self)
+
+    def to_json(self) -> str:
+        return json.dumps(self.to_dict())
+
+
+@dataclass
+class DeltaEnvelope:
+    protocol_version: str
+    contract: TelemetryContract
+    delta: Delta
+
+    def to_dict(self) -> Dict[str, Any]:
+        return {
+            "protocol_version": self.protocol_version,
+            "contract": self.contract.to_dict(),
+            "delta": self.delta.to_dict(),
+        }
+
+    def to_json(self) -> str:
+        return json.dumps(self.to_dict())
+
+
+def wrap_delta(delta: Delta, contract: TelemetryContract, protocol_version: str = "PulseMesh/0.1.0") -> DeltaEnvelope:
+    """Wrap a Delta into a DeltaEnvelope with contract metadata.
+
+    This is a light-weight protocol scaffold for Phase 0 MVP to enable
+    contract-driven delta transmission without coupling to a full runtime.
+    """
+    return DeltaEnvelope(protocol_version=protocol_version, contract=contract, delta=delta)