diff --git a/packages/eve-contracts/dist/generated/command-invocation.d.ts b/packages/eve-contracts/dist/generated/command-invocation.d.ts
index b0818b2..aba9560 100644
--- a/packages/eve-contracts/dist/generated/command-invocation.d.ts
+++ b/packages/eve-contracts/dist/generated/command-invocation.d.ts
@@ -18,4 +18,9 @@ export interface EveCommandInvocation {
     clientId: string;
     commandBoundary: string;
     receiptSchema: string;
+    delegation?: {
+        originalInvocationHash: string;
+        originalClientId: string;
+        delegatingRuntimeId: string;
+    };
 }
diff --git a/packages/eve-contracts/dist/generated/schemas.d.ts b/packages/eve-contracts/dist/generated/schemas.d.ts
index 0f1f0a4..8ea315a 100644
--- a/packages/eve-contracts/dist/generated/schemas.d.ts
+++ b/packages/eve-contracts/dist/generated/schemas.d.ts
@@ -564,6 +564,25 @@ export declare const eveContractSchemas: {
                 readonly type: "string";
                 readonly minLength: 1;
             };
+            readonly delegation: {
+                readonly type: "object";
+                readonly required: readonly ["originalInvocationHash", "originalClientId", "delegatingRuntimeId"];
+                readonly properties: {
+                    readonly originalInvocationHash: {
+                        readonly type: "string";
+                        readonly minLength: 1;
+                    };
+                    readonly originalClientId: {
+                        readonly type: "string";
+                        readonly minLength: 1;
+                    };
+                    readonly delegatingRuntimeId: {
+                        readonly type: "string";
+                        readonly minLength: 1;
+                    };
+                };
+                readonly additionalProperties: false;
+            };
         };
         readonly additionalProperties: false;
     };
diff --git a/packages/eve-contracts/dist/generated/schemas.js b/packages/eve-contracts/dist/generated/schemas.js
index 403420e..c036cf9 100644
--- a/packages/eve-contracts/dist/generated/schemas.js
+++ b/packages/eve-contracts/dist/generated/schemas.js
@@ -671,6 +671,29 @@ export const eveContractSchemas = {
             "receiptSchema": {
                 "type": "string",
                 "minLength": 1
+            },
+            "delegation": {
+                "type": "object",
+                "required": [
+                    "originalInvocationHash",
+                    "originalClientId",
+                    "delegatingRuntimeId"
+                ],
+                "properties": {
+                    "originalInvocationHash": {
+                        "type": "string",
+                        "minLength": 1
+                    },
+                    "originalClientId": {
+                        "type": "string",
+                        "minLength": 1
+                    },
+                    "delegatingRuntimeId": {
+                        "type": "string",
+                        "minLength": 1
+                    }
+                },
+                "additionalProperties": false
             }
         },
         "additionalProperties": false
diff --git a/packages/eve-contracts/src/generated/command-invocation.ts b/packages/eve-contracts/src/generated/command-invocation.ts
index 5c15093..8c72787 100644
--- a/packages/eve-contracts/src/generated/command-invocation.ts
+++ b/packages/eve-contracts/src/generated/command-invocation.ts
@@ -20,4 +20,9 @@ issuedAt: string
 clientId: string
 commandBoundary: string
 receiptSchema: string
+delegation?: {
+originalInvocationHash: string
+originalClientId: string
+delegatingRuntimeId: string
+}
 }
diff --git a/packages/eve-contracts/src/generated/schemas.ts b/packages/eve-contracts/src/generated/schemas.ts
index bd01380..18c877e 100644
--- a/packages/eve-contracts/src/generated/schemas.ts
+++ b/packages/eve-contracts/src/generated/schemas.ts
@@ -671,6 +671,29 @@ export const eveContractSchemas = {
       "receiptSchema": {
         "type": "string",
         "minLength": 1
+      },
+      "delegation": {
+        "type": "object",
+        "required": [
+          "originalInvocationHash",
+          "originalClientId",
+          "delegatingRuntimeId"
+        ],
+        "properties": {
+          "originalInvocationHash": {
+            "type": "string",
+            "minLength": 1
+          },
+          "originalClientId": {
+            "type": "string",
+            "minLength": 1
+          },
+          "delegatingRuntimeId": {
+            "type": "string",
+            "minLength": 1
+          }
+        },
+        "additionalProperties": false
       }
     },
     "additionalProperties": false
diff --git a/packages/org.gamecult.eve.surface/GameCult.Eve.Surface.csproj b/packages/org.gamecult.eve.surface/GameCult.Eve.Surface.csproj
index 4d03a28..b74ed1f 100644
--- a/packages/org.gamecult.eve.surface/GameCult.Eve.Surface.csproj
+++ b/packages/org.gamecult.eve.surface/GameCult.Eve.Surface.csproj
@@ -6,7 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Description>Portable Eve surface and provider contracts.</Description>
     <PackageId>GameCult.Eve.Surface</PackageId>
-    <Version>0.3.4</Version>
+    <Version>0.3.5</Version>
     <Authors>GameCult</Authors>
     <PackageLicenseExpression>MPL-2.0</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/GameCult/Eve</PackageProjectUrl>
diff --git a/packages/org.gamecult.eve.surface/Runtime/EveCommandInvocationHash.cs b/packages/org.gamecult.eve.surface/Runtime/EveCommandInvocationHash.cs
index 507b163..d7ee976 100644
--- a/packages/org.gamecult.eve.surface/Runtime/EveCommandInvocationHash.cs
+++ b/packages/org.gamecult.eve.surface/Runtime/EveCommandInvocationHash.cs
@@ -32,6 +32,9 @@ namespace GameCult.Eve.Surface
             Append(request.ClientId);
             Append(request.CommandBoundary);
             Append(request.ReceiptSchema);
+            Append(request.Delegation?.OriginalInvocationHash);
+            Append(request.Delegation?.OriginalClientId);
+            Append(request.Delegation?.DelegatingRuntimeId);
             using var sha256 = SHA256.Create();
             var bytes = sha256.ComputeHash(Encoding.UTF8.GetBytes(canonical.ToString()));
             var digest = new StringBuilder(bytes.Length * 2);
diff --git a/packages/org.gamecult.eve.surface/Runtime/EveSurfaceDocument.cs b/packages/org.gamecult.eve.surface/Runtime/EveSurfaceDocument.cs
index 4bb33f5..c9c2f39 100644
--- a/packages/org.gamecult.eve.surface/Runtime/EveSurfaceDocument.cs
+++ b/packages/org.gamecult.eve.surface/Runtime/EveSurfaceDocument.cs
@@ -335,7 +335,8 @@ namespace GameCult.Eve.Surface
             DateTimeOffset issuedAt,
             string clientId,
             string commandBoundary = "",
-            string receiptSchema = "")
+            string receiptSchema = "",
+            EveCommandDelegationRecord? delegation = null)
             : this(
                 SchemaId,
                 providerId,
@@ -346,7 +347,8 @@ namespace GameCult.Eve.Surface
                 issuedAt,
                 clientId,
                 commandBoundary,
-                receiptSchema)
+                receiptSchema,
+                delegation)
         {
         }
 
@@ -360,7 +362,8 @@ namespace GameCult.Eve.Surface
             DateTimeOffset issuedAt,
             string clientId,
             string commandBoundary,
-            string receiptSchema)
+            string receiptSchema,
+            EveCommandDelegationRecord? delegation = null)
         {
             Schema = string.IsNullOrWhiteSpace(schema) ? SchemaId : schema;
             ProviderId = providerId;
@@ -373,6 +376,7 @@ namespace GameCult.Eve.Surface
             ClientId = clientId;
             CommandBoundary = commandBoundary ?? "";
             ReceiptSchema = receiptSchema ?? "";
+            Delegation = delegation;
         }
 
         [Key(0)]
@@ -411,10 +415,32 @@ namespace GameCult.Eve.Surface
         [Key(8)]
         public string ReceiptSchema { get; }
 
+        [Key(9)]
+        public EveCommandDelegationRecord? Delegation { get; }
+
         [IgnoreMember]
         public string CommandId => Operation.IdempotencyKey ?? "";
     }
 
+    [MessagePackObject]
+    public sealed class EveCommandDelegationRecord
+    {
+        [SerializationConstructor]
+        public EveCommandDelegationRecord(
+            string originalInvocationHash,
+            string originalClientId,
+            string delegatingRuntimeId)
+        {
+            OriginalInvocationHash = originalInvocationHash ?? "";
+            OriginalClientId = originalClientId ?? "";
+            DelegatingRuntimeId = delegatingRuntimeId ?? "";
+        }
+
+        [Key(0)] public string OriginalInvocationHash { get; }
+        [Key(1)] public string OriginalClientId { get; }
+        [Key(2)] public string DelegatingRuntimeId { get; }
+    }
+
     /// <summary>
     /// Reads the current Eve surface envelope and the original seven-field v1 envelope.
     /// </summary>
diff --git a/packages/org.gamecult.eve.surface/package.json b/packages/org.gamecult.eve.surface/package.json
index 939a870..378f218 100644
--- a/packages/org.gamecult.eve.surface/package.json
+++ b/packages/org.gamecult.eve.surface/package.json
@@ -1,7 +1,7 @@
 {
     "name": "org.gamecult.eve.surface",
     "displayName": "Eve Surface Contract",
-    "version": "0.3.4",
+    "version": "0.3.5",
     "unity": "2021.3",
     "description": "Renderer-neutral C# contracts and builders for gamecult.eve.surface.v1 documents.",
     "dependencies": {
diff --git a/schemas/gamecult.eve.command_invocation.v1.schema.json b/schemas/gamecult.eve.command_invocation.v1.schema.json
index e3697fb..1df8dcc 100644
--- a/schemas/gamecult.eve.command_invocation.v1.schema.json
+++ b/schemas/gamecult.eve.command_invocation.v1.schema.json
@@ -33,7 +33,17 @@
     "issuedAt": { "type": "string" },
     "clientId": { "type": "string", "minLength": 1 },
     "commandBoundary": { "type": "string", "minLength": 1 },
-    "receiptSchema": { "type": "string", "minLength": 1 }
+    "receiptSchema": { "type": "string", "minLength": 1 },
+    "delegation": {
+      "type": "object",
+      "required": ["originalInvocationHash", "originalClientId", "delegatingRuntimeId"],
+      "properties": {
+        "originalInvocationHash": { "type": "string", "minLength": 1 },
+        "originalClientId": { "type": "string", "minLength": 1 },
+        "delegatingRuntimeId": { "type": "string", "minLength": 1 }
+      },
+      "additionalProperties": false
+    }
   },
   "additionalProperties": false
 }
diff --git a/tests/GameCult.Eve.Surface.Serialization.Tests/EveSurfaceSerializationCompatibilityTests.cs b/tests/GameCult.Eve.Surface.Serialization.Tests/EveSurfaceSerializationCompatibilityTests.cs
index 52d71cc..be11714 100644
--- a/tests/GameCult.Eve.Surface.Serialization.Tests/EveSurfaceSerializationCompatibilityTests.cs
+++ b/tests/GameCult.Eve.Surface.Serialization.Tests/EveSurfaceSerializationCompatibilityTests.cs
@@ -106,6 +106,22 @@ public sealed class EveSurfaceSerializationCompatibilityTests
 
         Assert.That(EveCommandInvocationHash.Compute(same), Is.EqualTo(EveCommandInvocationHash.Compute(request)));
         Assert.That(EveCommandInvocationHash.Compute(changedPayload), Is.Not.EqualTo(EveCommandInvocationHash.Compute(request)));
+        var delegated = new EveSurfaceCommandRequest(
+            request.Schema,
+            request.ProviderId,
+            request.SurfaceId,
+            request.OperationRecord,
+            new Dictionary<string, string>(request.PayloadFields, StringComparer.Ordinal),
+            request.IssuedAt,
+            "progression-router",
+            request.CommandBoundary,
+            request.ReceiptSchema,
+            new EveCommandDelegationRecord(
+                EveCommandInvocationHash.Compute(request),
+                request.ClientId,
+                "progression-router"));
+        Assert.That(EveCommandInvocationHash.Compute(delegated), Is.Not.EqualTo(EveCommandInvocationHash.Compute(request)));
+        Assert.That(delegated.Delegation!.OriginalInvocationHash, Is.EqualTo(EveCommandInvocationHash.Compute(request)));
     }
 
     [Test]