diff --git a/src/GameCult.Networking/Contracts/cultnet.operation-request.schema.json b/src/GameCult.Networking/Contracts/cultnet.operation-request.schema.json
new file mode 100644
index 00000000..07cd9d8d
--- /dev/null
+++ b/src/GameCult.Networking/Contracts/cultnet.operation-request.schema.json
@@ -0,0 +1,19 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.operation-request.schema.json",
+  "title": "CultNet Operation Request",
+  "type": "object",
+  "required": ["schemaVersion", "messageId", "serviceId", "operation", "payloadSchema", "payload"],
+  "additionalProperties": false,
+  "properties": {
+    "schemaVersion": { "const": "cultnet.operation_request.v0" },
+    "messageId": { "type": "string", "minLength": 1 },
+    "serviceId": { "type": "string", "minLength": 1 },
+    "operation": { "type": "string", "minLength": 1 },
+    "payloadSchema": { "type": "string", "minLength": 1 },
+    "payloadEncoding": { "const": "messagepack-base64" },
+    "payload": { "type": "string", "minLength": 1, "contentEncoding": "base64" },
+    "sourceRuntimeId": { "type": "string", "minLength": 1 },
+    "targetRuntimeId": { "type": "string", "minLength": 1 }
+  }
+}
diff --git a/src/GameCult.Networking/Contracts/cultnet.operation-response.schema.json b/src/GameCult.Networking/Contracts/cultnet.operation-response.schema.json
new file mode 100644
index 00000000..c3be917d
--- /dev/null
+++ b/src/GameCult.Networking/Contracts/cultnet.operation-response.schema.json
@@ -0,0 +1,20 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.operation-response.schema.json",
+  "title": "CultNet Operation Response",
+  "type": "object",
+  "required": ["schemaVersion", "messageId", "serviceId", "operation", "status", "payloadSchema", "payload"],
+  "additionalProperties": false,
+  "properties": {
+    "schemaVersion": { "const": "cultnet.operation_response.v0" },
+    "messageId": { "type": "string", "minLength": 1 },
+    "serviceId": { "type": "string", "minLength": 1 },
+    "operation": { "type": "string", "minLength": 1 },
+    "status": { "type": "string", "minLength": 1 },
+    "payloadSchema": { "type": "string", "minLength": 1 },
+    "payloadEncoding": { "const": "messagepack-base64" },
+    "payload": { "type": "string", "minLength": 1, "contentEncoding": "base64" },
+    "diagnostics": { "type": "array", "items": { "type": "string" } },
+    "sourceRuntimeId": { "type": "string", "minLength": 1 }
+  }
+}
diff --git a/src/GameCult.Networking/CultNetSchemaMessageSerialization.cs b/src/GameCult.Networking/CultNetSchemaMessageSerialization.cs
index 5e9431b4..a8487665 100644
--- a/src/GameCult.Networking/CultNetSchemaMessageSerialization.cs
+++ b/src/GameCult.Networking/CultNetSchemaMessageSerialization.cs
@@ -55,6 +55,8 @@ namespace GameCult.Networking
                 CultNetSchemaVersions.Error => Deserialize<CultNetErrorMessage>(payload),
                 CultNetSchemaVersions.SampleChangeName => Deserialize<CultNetSampleChangeNameMessage>(payload),
                 CultNetSchemaVersions.SampleChat => Deserialize<CultNetSampleChatMessage>(payload),
+                CultNetSchemaVersions.OperationRequest => Deserialize<CultNetOperationRequestMessage>(payload),
+                CultNetSchemaVersions.OperationResponse => Deserialize<CultNetOperationResponseMessage>(payload),
                 CultNetSchemaVersions.DocumentDelete => Deserialize<CultNetDocumentDeleteMessage>(payload),
                 CultNetSchemaVersions.DocumentPutRaw => Deserialize<CultNetDocumentPutRawMessage>(payload),
                 CultNetSchemaVersions.SnapshotRequest => Deserialize<CultNetSnapshotRequestMessage>(payload),
diff --git a/src/GameCult.Networking/CultNetSchemaMessages.cs b/src/GameCult.Networking/CultNetSchemaMessages.cs
index ccac3dbf..a37c2bc0 100644
--- a/src/GameCult.Networking/CultNetSchemaMessages.cs
+++ b/src/GameCult.Networking/CultNetSchemaMessages.cs
@@ -56,6 +56,14 @@ namespace GameCult.Networking
         /// </summary>
         public const string SampleChat = "cultnet.sample.chat.v0";
         /// <summary>
+        /// Generic typed service operation request contract identifier.
+        /// </summary>
+        public const string OperationRequest = "cultnet.operation_request.v0";
+        /// <summary>
+        /// Generic typed service operation response contract identifier.
+        /// </summary>
+        public const string OperationResponse = "cultnet.operation_response.v0";
+        /// <summary>
         /// document delete contract identifier.
         /// </summary>
         public const string DocumentDelete = "cultnet.document_delete.v0";
@@ -519,6 +527,60 @@ namespace GameCult.Networking
         [Key("text")] public string Text { get; set; } = string.Empty;
     }
 
+    /// <summary>
+    /// Invokes one typed operation on an advertised service.
+    /// </summary>
+    [MessagePackObject]
+    public class CultNetOperationRequestMessage : ICultNetSchemaMessage
+    {
+        /// <summary>Gets or sets the wire schema version.</summary>
+        [Key("schemaVersion")] public string SchemaVersion { get; set; } = CultNetSchemaVersions.OperationRequest;
+        /// <summary>Gets or sets the correlation id.</summary>
+        [Key("messageId")] public string MessageId { get; set; } = string.Empty;
+        /// <summary>Gets or sets the advertised service id.</summary>
+        [Key("serviceId")] public string ServiceId { get; set; } = string.Empty;
+        /// <summary>Gets or sets the requested operation.</summary>
+        [Key("operation")] public string Operation { get; set; } = string.Empty;
+        /// <summary>Gets or sets the inner payload schema.</summary>
+        [Key("payloadSchema")] public string PayloadSchema { get; set; } = string.Empty;
+        /// <summary>Gets or sets the inner payload encoding.</summary>
+        [Key("payloadEncoding")] public string PayloadEncoding { get; set; } = "messagepack-base64";
+        /// <summary>Gets or sets the encoded inner payload.</summary>
+        [Key("payload")] public string Payload { get; set; } = string.Empty;
+        /// <summary>Gets or sets the calling runtime id.</summary>
+        [Key("sourceRuntimeId")] public string? SourceRuntimeId { get; set; }
+        /// <summary>Gets or sets an optional target runtime id.</summary>
+        [Key("targetRuntimeId")] public string? TargetRuntimeId { get; set; }
+    }
+
+    /// <summary>
+    /// Returns the correlated result of one typed service operation.
+    /// </summary>
+    [MessagePackObject]
+    public class CultNetOperationResponseMessage : ICultNetSchemaMessage
+    {
+        /// <summary>Gets or sets the wire schema version.</summary>
+        [Key("schemaVersion")] public string SchemaVersion { get; set; } = CultNetSchemaVersions.OperationResponse;
+        /// <summary>Gets or sets the request correlation id.</summary>
+        [Key("messageId")] public string MessageId { get; set; } = string.Empty;
+        /// <summary>Gets or sets the advertised service id.</summary>
+        [Key("serviceId")] public string ServiceId { get; set; } = string.Empty;
+        /// <summary>Gets or sets the completed operation.</summary>
+        [Key("operation")] public string Operation { get; set; } = string.Empty;
+        /// <summary>Gets or sets the operation status.</summary>
+        [Key("status")] public string Status { get; set; } = string.Empty;
+        /// <summary>Gets or sets the inner payload schema.</summary>
+        [Key("payloadSchema")] public string PayloadSchema { get; set; } = string.Empty;
+        /// <summary>Gets or sets the inner payload encoding.</summary>
+        [Key("payloadEncoding")] public string PayloadEncoding { get; set; } = "messagepack-base64";
+        /// <summary>Gets or sets the encoded inner payload.</summary>
+        [Key("payload")] public string Payload { get; set; } = string.Empty;
+        /// <summary>Gets or sets transport-level diagnostics.</summary>
+        [Key("diagnostics")] public string[] Diagnostics { get; set; } = Array.Empty<string>();
+        /// <summary>Gets or sets the responding runtime id.</summary>
+        [Key("sourceRuntimeId")] public string? SourceRuntimeId { get; set; }
+    }
+
     /// <summary>
     /// Raw document record carried over CultNet.
     /// </summary>
diff --git a/src/GameCult.Networking/CultNetSchemaRegistry.cs b/src/GameCult.Networking/CultNetSchemaRegistry.cs
index baa20b5b..037c0d84 100644
--- a/src/GameCult.Networking/CultNetSchemaRegistry.cs
+++ b/src/GameCult.Networking/CultNetSchemaRegistry.cs
@@ -322,6 +322,20 @@ namespace GameCult.Networking
                 WireContracts = new[] { CultNetWireContracts.SchemaV0, CultNetWireContracts.GameCultNetworkingV0 }
             },
             new SchemaResourceSpec
+            {
+                FileName = "cultnet.operation-request.schema.json",
+                Kind = "wire_message",
+                SchemaVersion = CultNetSchemaVersions.OperationRequest,
+                WireContracts = new[] { CultNetWireContracts.SchemaV0 }
+            },
+            new SchemaResourceSpec
+            {
+                FileName = "cultnet.operation-response.schema.json",
+                Kind = "wire_message",
+                SchemaVersion = CultNetSchemaVersions.OperationResponse,
+                WireContracts = new[] { CultNetWireContracts.SchemaV0 }
+            },
+            new SchemaResourceSpec
             {
                 FileName = "cultnet.document-delete.schema.json",
                 Kind = "wire_message",
diff --git a/tests/GameCult.Networking.Tests/NetworkingTests.cs b/tests/GameCult.Networking.Tests/NetworkingTests.cs
index 526c3fa6..3b54be31 100644
--- a/tests/GameCult.Networking.Tests/NetworkingTests.cs
+++ b/tests/GameCult.Networking.Tests/NetworkingTests.cs
@@ -431,6 +431,27 @@ namespace GameCult.Networking.Tests
                 Is.EqualTo(new int?[] { 64, 64, 64 }));
         }
 
+        [Test]
+        public void CultNetSchemaMessageSerialization_RoundTrips_OperationEnvelope()
+        {
+            var request = new CultNetOperationRequestMessage
+            {
+                MessageId = "plugin-42",
+                ServiceId = "sai.vn",
+                Operation = "project",
+                PayloadSchema = "gamecult.eve.plugin_abi.request.v1",
+                Payload = "gaZzY2hlbWHEJ2dhbWVjdWx0LmV2ZS5wbHVnaW5fYWJpLnJlcXVlc3QudjE=",
+                SourceRuntimeId = "eve-unity"
+            };
+
+            var payload = CultNetSchemaMessageSerialization.Serialize(request);
+            var roundTrip = (CultNetOperationRequestMessage)CultNetSchemaMessageSerialization.Deserialize(payload);
+
+            Assert.That(roundTrip.MessageId, Is.EqualTo(request.MessageId));
+            Assert.That(roundTrip.ServiceId, Is.EqualTo("sai.vn"));
+            Assert.That(roundTrip.PayloadSchema, Is.EqualTo("gamecult.eve.plugin_abi.request.v1"));
+        }
+
         [Test]
         public void LiteNetLibTransportProfile_AdvertisesLegacyAndSchemaChannels()
         {