diff --git a/agents/rap-node-agent/internal/mesh/contracts.go b/agents/rap-node-agent/internal/mesh/contracts.go
index dd610ec..8e9e44b 100644
--- a/agents/rap-node-agent/internal/mesh/contracts.go
+++ b/agents/rap-node-agent/internal/mesh/contracts.go
@@ -16,6 +16,7 @@ var (
 	ErrForwardPeerUnavailable        = errors.New("production mesh next peer is unavailable")
 	ErrForwardEnvelopeInvalid        = errors.New("production mesh envelope is invalid")
 	ErrForwardObservationFailed      = errors.New("production mesh envelope observation failed")
+	ErrForwardDeliveryFailed         = errors.New("production mesh envelope delivery failed")
 	ErrMeshRuntimeDisabled           = errors.New("mesh synthetic runtime is disabled")
 	ErrUnsupportedSyntheticMessage   = errors.New("unsupported synthetic mesh message")
 	ErrRouteIDRequired               = errors.New("mesh synthetic route id is required")
@@ -57,10 +58,18 @@ const (
 	SyntheticRouteStateDegraded = "degraded"
 	SyntheticRouteStateFailed   = "failed"
 
-	ProductionChannelFabricControl    = "fabric_control"
-	ProductionMessageFabricControl    = "fabric.control"
-	MaxProductionEnvelopePayloadBytes = 4096
-	MaxProductionEnvelopeFutureSkew   = time.Minute
+	ProductionChannelFabricControl     = "fabric_control"
+	ProductionMessageFabricControl     = "fabric.control"
+	ProductionChannelVPNPacket         = "vpn_packet"
+	ProductionMessageVPNPacketBatch    = "vpn.packet_batch"
+	FabricServiceClassVPNPackets       = "vpn_packets"
+	FabricServiceChannelBulk           = "bulk"
+	FabricServiceChannelControl        = "control"
+	FabricServiceChannelInteractive    = "interactive"
+	FabricServiceChannelReliable       = "reliable"
+	MaxProductionEnvelopePayloadBytes  = 4096
+	MaxProductionVPNPacketPayloadBytes = 256 * 1024
+	MaxProductionEnvelopeFutureSkew    = time.Minute
 )
 
 type PeerIdentity struct {