diff --git a/dotnet/samples/GettingStarted/AgentProviders/Agent_With_CustomImplementation/Program.cs b/dotnet/samples/GettingStarted/AgentProviders/Agent_With_CustomImplementation/Program.cs
index 82f76e7599..cc0c15eda5 100644
--- a/dotnet/samples/GettingStarted/AgentProviders/Agent_With_CustomImplementation/Program.cs
+++ b/dotnet/samples/GettingStarted/AgentProviders/Agent_With_CustomImplementation/Program.cs
@@ -28,10 +28,10 @@ internal sealed class UpperCaseParrotAgent : AIAgent
     {
         public override string? Name => "UpperCaseParrotAgent";
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
             => new(new CustomAgentSession());
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         {
             if (session is not CustomAgentSession typedSession)
             {
@@ -41,7 +41,7 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
             return typedSession.Serialize(jsonSerializerOptions);
         }
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
             => new(new CustomAgentSession(serializedState, jsonSerializerOptions));
 
         protected override async Task<AgentResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)
diff --git a/dotnet/src/Microsoft.Agents.AI.A2A/A2AAgent.cs b/dotnet/src/Microsoft.Agents.AI.A2A/A2AAgent.cs
index 3c4528a419..533b50c8fe 100644
--- a/dotnet/src/Microsoft.Agents.AI.A2A/A2AAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.A2A/A2AAgent.cs
@@ -54,7 +54,7 @@ public A2AAgent(A2AClient a2aClient, string? id = null, string? name = null, str
     }
 
     /// <inheritdoc/>
-    public sealed override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected sealed override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
         => new(new A2AAgentSession());
 
     /// <summary>
@@ -66,7 +66,7 @@ public ValueTask<AgentSession> CreateSessionAsync(string contextId)
         => new(new A2AAgentSession() { ContextId = contextId });
 
     /// <inheritdoc/>
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         _ = Throw.IfNull(session);
 
@@ -79,7 +79,7 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
     }
 
     /// <inheritdoc/>
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         => new(new A2AAgentSession(serializedState, jsonSerializerOptions));
 
     /// <inheritdoc/>
diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgent.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgent.cs
index 924628f62a..881b398658 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgent.cs
@@ -139,7 +139,18 @@ public static AgentRunContext? CurrentRunContext
     /// may be deferred until first use to optimize performance.
     /// </para>
     /// </remarks>
-    public abstract ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default);
+    public ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        => this.CreateSessionCoreAsync(cancellationToken);
+
+    /// <summary>
+    /// Core implementation of session creation logic.
+    /// </summary>
+    /// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests. The default is <see cref="CancellationToken.None"/>.</param>
+    /// <returns>A value task that represents the asynchronous operation. The task result contains a new <see cref="AgentSession"/> instance ready for use with this agent.</returns>
+    /// <remarks>
+    /// This is the primary session creation method that implementations must override.
+    /// </remarks>
+    protected abstract ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Serializes an agent session to its JSON representation.
@@ -154,7 +165,19 @@ public static AgentRunContext? CurrentRunContext
     /// allowing conversations to resume across application restarts or be migrated between
     /// different agent instances. Use <see cref="DeserializeSessionAsync"/> to restore the session.
     /// </remarks>
-    public abstract JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null);
+    public JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        => this.SerializeSessionCore(session, jsonSerializerOptions);
+
+    /// <summary>
+    /// Core implementation of session serialization logic.
+    /// </summary>
+    /// <param name="session">The <see cref="AgentSession"/> to serialize.</param>
+    /// <param name="jsonSerializerOptions">Optional settings to customize the serialization process.</param>
+    /// <returns>A <see cref="JsonElement"/> containing the serialized session state.</returns>
+    /// <remarks>
+    /// This is the primary session serialization method that implementations must override.
+    /// </remarks>
+    protected abstract JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null);
 
     /// <summary>
     /// Deserializes an agent session from its JSON serialized representation.
@@ -170,7 +193,20 @@ public static AgentRunContext? CurrentRunContext
     /// allowing conversations to resume across application restarts or be migrated between
     /// different agent instances.
     /// </remarks>
-    public abstract ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default);
+    public ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        => this.DeserializeSessionCoreAsync(serializedState, jsonSerializerOptions, cancellationToken);
+
+    /// <summary>
+    /// Core implementation of session deserialization logic.
+    /// </summary>
+    /// <param name="serializedState">A <see cref="JsonElement"/> containing the serialized session state.</param>
+    /// <param name="jsonSerializerOptions">Optional settings to customize the deserialization process.</param>
+    /// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests. The default is <see cref="CancellationToken.None"/>.</param>
+    /// <returns>A value task that represents the asynchronous operation. The task result contains a restored <see cref="AgentSession"/> instance with the state from <paramref name="serializedState"/>.</returns>
+    /// <remarks>
+    /// This is the primary session deserialization method that implementations must override.
+    /// </remarks>
+    protected abstract ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default);
 
     /// <summary>
     /// Run the agent with no message assuming that all required instructions are already provided to the agent or on the session.
diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/DelegatingAIAgent.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/DelegatingAIAgent.cs
index 6945f22df8..b20ba43dd1 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/DelegatingAIAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/DelegatingAIAgent.cs
@@ -74,14 +74,14 @@ protected DelegatingAIAgent(AIAgent innerAgent)
     }
 
     /// <inheritdoc />
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) => this.InnerAgent.CreateSessionAsync(cancellationToken);
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) => this.InnerAgent.CreateSessionAsync(cancellationToken);
 
     /// <inheritdoc />
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         => this.InnerAgent.SerializeSession(session, jsonSerializerOptions);
 
     /// <inheritdoc />
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         => this.InnerAgent.DeserializeSessionAsync(serializedState, jsonSerializerOptions, cancellationToken);
 
     /// <inheritdoc />
diff --git a/dotnet/src/Microsoft.Agents.AI.CopilotStudio/CopilotStudioAgent.cs b/dotnet/src/Microsoft.Agents.AI.CopilotStudio/CopilotStudioAgent.cs
index 192cd863db..48642139a9 100644
--- a/dotnet/src/Microsoft.Agents.AI.CopilotStudio/CopilotStudioAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.CopilotStudio/CopilotStudioAgent.cs
@@ -42,7 +42,7 @@ public CopilotStudioAgent(CopilotClient client, ILoggerFactory? loggerFactory =
     }
 
     /// <inheritdoc/>
-    public sealed override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected sealed override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
         => new(new CopilotStudioAgentSession());
 
     /// <summary>
@@ -54,7 +54,7 @@ public ValueTask<AgentSession> CreateSessionAsync(string conversationId)
         => new(new CopilotStudioAgentSession() { ConversationId = conversationId });
 
     /// <inheritdoc/>
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         Throw.IfNull(session);
 
@@ -67,7 +67,7 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
     }
 
     /// <inheritdoc/>
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         => new(new CopilotStudioAgentSession(serializedState, jsonSerializerOptions));
 
     /// <inheritdoc/>
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/CHANGELOG.md b/dotnet/src/Microsoft.Agents.AI.DurableTask/CHANGELOG.md
index db3eebde57..c34a8fe95d 100644
--- a/dotnet/src/Microsoft.Agents.AI.DurableTask/CHANGELOG.md
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/CHANGELOG.md
@@ -10,6 +10,7 @@
 - Renamed AgentThread to AgentSession ([#3430](https://github.com/microsoft/agent-framework/pull/3430))
 - Moved AgentSession.Serialize to AIAgent.SerializeSession ([#3650](https://github.com/microsoft/agent-framework/pull/3650))
 - Renamed serializedSession parameter to serializedState on DeserializeSessionAsync for consistency ([#3681](https://github.com/microsoft/agent-framework/pull/3681))
+- Introduce Core method pattern for Session management methods on AIAgent ([#3699](https://github.com/microsoft/agent-framework/pull/3699))
 
 ## v1.0.0-preview.251204.1
 
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableAIAgent.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableAIAgent.cs
index 3253ba3b65..547e999449 100644
--- a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableAIAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableAIAgent.cs
@@ -34,7 +34,7 @@ internal DurableAIAgent(TaskOrchestrationContext context, string agentName)
     /// </summary>
     /// <param name="cancellationToken">The cancellation token.</param>
     /// <returns>A value task that represents the asynchronous operation. The task result contains a new agent session.</returns>
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
     {
         AgentSessionId sessionId = this._context.NewAgentSessionId(this._agentName);
         return ValueTask.FromResult<AgentSession>(new DurableAgentSession(sessionId));
@@ -46,7 +46,7 @@ public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken can
     /// <param name="session">The session to serialize.</param>
     /// <param name="jsonSerializerOptions">Optional JSON serializer options.</param>
     /// <returns>A <see cref="JsonElement"/> containing the serialized session state.</returns>
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         if (session is null)
         {
@@ -68,7 +68,7 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
     /// <param name="jsonSerializerOptions">Optional JSON serializer options.</param>
     /// <param name="cancellationToken">The cancellation token.</param>
     /// <returns>A value task that represents the asynchronous operation. The task result contains the deserialized agent session.</returns>
-    public override ValueTask<AgentSession> DeserializeSessionAsync(
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(
         JsonElement serializedState,
         JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
     {
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableAIAgentProxy.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableAIAgentProxy.cs
index 0a09257d9b..618b43916c 100644
--- a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableAIAgentProxy.cs
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableAIAgentProxy.cs
@@ -11,7 +11,7 @@ internal class DurableAIAgentProxy(string name, IDurableAgentClient agentClient)
 
     public override string? Name { get; } = name;
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         if (session is null)
         {
@@ -26,14 +26,14 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
         return durableSession.Serialize(jsonSerializerOptions);
     }
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(
         JsonElement serializedState,
         JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
     {
         return ValueTask.FromResult<AgentSession>(DurableAgentSession.Deserialize(serializedState, jsonSerializerOptions));
     }
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
     {
         return ValueTask.FromResult<AgentSession>(new DurableAgentSession(AgentSessionId.WithRandomKey(this.Name!)));
     }
diff --git a/dotnet/src/Microsoft.Agents.AI.GitHub.Copilot/GitHubCopilotAgent.cs b/dotnet/src/Microsoft.Agents.AI.GitHub.Copilot/GitHubCopilotAgent.cs
index 92a87ee471..06c7f24ee2 100644
--- a/dotnet/src/Microsoft.Agents.AI.GitHub.Copilot/GitHubCopilotAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.GitHub.Copilot/GitHubCopilotAgent.cs
@@ -86,7 +86,7 @@ public GitHubCopilotAgent(
     }
 
     /// <inheritdoc/>
-    public sealed override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected sealed override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
         => new(new GitHubCopilotAgentSession());
 
     /// <summary>
@@ -98,7 +98,7 @@ public ValueTask<AgentSession> CreateSessionAsync(string sessionId)
         => new(new GitHubCopilotAgentSession() { SessionId = sessionId });
 
     /// <inheritdoc/>
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         _ = Throw.IfNull(session);
 
@@ -111,7 +111,7 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
     }
 
     /// <inheritdoc/>
-    public override ValueTask<AgentSession> DeserializeSessionAsync(
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(
         JsonElement serializedState,
         JsonSerializerOptions? jsonSerializerOptions = null,
         CancellationToken cancellationToken = default)
diff --git a/dotnet/src/Microsoft.Agents.AI.Purview/PurviewAgent.cs b/dotnet/src/Microsoft.Agents.AI.Purview/PurviewAgent.cs
index fa6f55a9ac..7ea854e5ec 100644
--- a/dotnet/src/Microsoft.Agents.AI.Purview/PurviewAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Purview/PurviewAgent.cs
@@ -30,19 +30,19 @@ public PurviewAgent(AIAgent innerAgent, PurviewWrapper purviewWrapper)
     }
 
     /// <inheritdoc/>
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         return this._innerAgent.SerializeSession(session, jsonSerializerOptions);
     }
 
     /// <inheritdoc/>
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
     {
         return this._innerAgent.DeserializeSessionAsync(serializedState, jsonSerializerOptions, cancellationToken);
     }
 
     /// <inheritdoc/>
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
     {
         return this._innerAgent.CreateSessionAsync(cancellationToken);
     }
diff --git a/dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowHostAgent.cs b/dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowHostAgent.cs
index 189ca43101..66f71a219a 100644
--- a/dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowHostAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowHostAgent.cs
@@ -65,10 +65,10 @@ private async ValueTask ValidateWorkflowAsync()
         protocol.ThrowIfNotChatProtocol(allowCatchAll: true);
     }
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
         => new(new WorkflowSession(this._workflow, this.GenerateNewId(), this._executionEnvironment, this._checkpointManager, this._includeExceptionDetails, this._includeWorkflowOutputsInResponse));
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         _ = Throw.IfNull(session);
 
@@ -80,7 +80,7 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
         return workflowSession.Serialize(jsonSerializerOptions);
     }
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         => new(new WorkflowSession(this._workflow, serializedState, this._executionEnvironment, this._checkpointManager, this._includeExceptionDetails, this._includeWorkflowOutputsInResponse, jsonSerializerOptions));
 
     private async ValueTask<WorkflowSession> UpdateSessionAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, CancellationToken cancellationToken = default)
diff --git a/dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgent.cs b/dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgent.cs
index 23e120f14f..1567e2bcc1 100644
--- a/dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgent.cs
@@ -302,7 +302,7 @@ protected override async IAsyncEnumerable<AgentResponseUpdate> RunCoreStreamingA
         : this.ChatClient.GetService(serviceType, serviceKey));
 
     /// <inheritdoc/>
-    public override async ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected override async ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
     {
         ChatHistoryProvider? chatHistoryProvider = this._agentOptions?.ChatHistoryProviderFactory is not null
             ? await this._agentOptions.ChatHistoryProviderFactory.Invoke(new() { SerializedState = default, JsonSerializerOptions = null }, cancellationToken).ConfigureAwait(false)
@@ -386,7 +386,7 @@ public async ValueTask<AgentSession> CreateSessionAsync(ChatHistoryProvider chat
     }
 
     /// <inheritdoc/>
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         _ = Throw.IfNull(session);
 
@@ -399,7 +399,7 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
     }
 
     /// <inheritdoc/>
-    public override async ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override async ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
     {
         Func<JsonElement, JsonSerializerOptions?, CancellationToken, ValueTask<ChatHistoryProvider>>? chatHistoryProviderFactory = this._agentOptions?.ChatHistoryProviderFactory is null ?
             null :
diff --git a/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AIAgentTests.cs b/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AIAgentTests.cs
index 1050e34194..e964805b3f 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AIAgentTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AIAgentTests.cs
@@ -573,13 +573,13 @@ public MockAgent(string? id = null)
 
         protected override string? IdCore { get; }
 
-        public override async ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
             => throw new NotImplementedException();
 
-        public override async ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
         protected override Task<AgentResponse> RunCoreAsync(
@@ -611,13 +611,13 @@ public MockAgentWithName(string? name, string? description)
         public override string? Name => this._name;
         public override string? Description => this._description;
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
             => throw new NotImplementedException();
 
         protected override Task<AgentResponse> RunCoreAsync(
diff --git a/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AgentRunContextTests.cs b/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AgentRunContextTests.cs
index 91b9726ae4..693f1ea0a4 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AgentRunContextTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AgentRunContextTests.cs
@@ -205,13 +205,13 @@ private sealed class TestAgentSession : AgentSession;
 
     private sealed class TestAgent : AIAgent
     {
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
             => throw new NotImplementedException();
 
         protected override Task<AgentResponse> RunCoreAsync(
diff --git a/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/DelegatingAIAgentTests.cs b/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/DelegatingAIAgentTests.cs
index 3c49f6f178..c087419de2 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/DelegatingAIAgentTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/DelegatingAIAgentTests.cs
@@ -27,7 +27,7 @@ public class DelegatingAIAgentTests
     /// </summary>
     public DelegatingAIAgentTests()
     {
-        this._innerAgentMock = new Mock<AIAgent>();
+        this._innerAgentMock = new Mock<AIAgent> { CallBase = true };
         this._testResponse = new AgentResponse(new ChatMessage(ChatRole.Assistant, "Test response"));
         this._testStreamingResponses = [new AgentResponseUpdate(ChatRole.Assistant, "Test streaming response")];
         this._testSession = new TestAgentSession();
@@ -36,7 +36,10 @@ public DelegatingAIAgentTests()
         this._innerAgentMock.Protected().SetupGet<string>("IdCore").Returns("test-agent-id");
         this._innerAgentMock.Setup(x => x.Name).Returns("Test Agent");
         this._innerAgentMock.Setup(x => x.Description).Returns("Test Description");
-        this._innerAgentMock.Setup(x => x.CreateSessionAsync()).ReturnsAsync(this._testSession);
+        this._innerAgentMock
+            .Protected()
+            .Setup<ValueTask<AgentSession>>("CreateSessionCoreAsync", ItExpr.IsAny<CancellationToken>())
+            .ReturnsAsync(this._testSession);
 
         this._innerAgentMock
             .Protected()
@@ -143,7 +146,9 @@ public async Task CreateSessionAsync_DelegatesToInnerAgentAsync()
 
         // Assert
         Assert.Same(this._testSession, session);
-        this._innerAgentMock.Verify(x => x.CreateSessionAsync(), Times.Once);
+        this._innerAgentMock
+            .Protected()
+            .Verify<ValueTask<AgentSession>>("CreateSessionCoreAsync", Times.Once(), ItExpr.IsAny<CancellationToken>());
     }
 
     /// <summary>
@@ -155,7 +160,8 @@ public async Task DeserializeSessionAsync_DelegatesToInnerAgentAsync()
         // Arrange
         var serializedSession = JsonSerializer.SerializeToElement("test-session-id", TestJsonSerializerContext.Default.String);
         this._innerAgentMock
-            .Setup(x => x.DeserializeSessionAsync(It.IsAny<JsonElement>(), null, It.IsAny<CancellationToken>()))
+            .Protected()
+            .Setup<ValueTask<AgentSession>>("DeserializeSessionCoreAsync", ItExpr.IsAny<JsonElement>(), ItExpr.IsAny<JsonSerializerOptions?>(), ItExpr.IsAny<CancellationToken>())
             .ReturnsAsync(this._testSession);
 
         // Act
@@ -163,7 +169,9 @@ public async Task DeserializeSessionAsync_DelegatesToInnerAgentAsync()
 
         // Assert
         Assert.Same(this._testSession, session);
-        this._innerAgentMock.Verify(x => x.DeserializeSessionAsync(It.IsAny<JsonElement>(), null, It.IsAny<CancellationToken>()), Times.Once);
+        this._innerAgentMock
+            .Protected()
+            .Verify<ValueTask<AgentSession>>("DeserializeSessionCoreAsync", Times.Once(), ItExpr.IsAny<JsonElement>(), ItExpr.IsAny<JsonSerializerOptions?>(), ItExpr.IsAny<CancellationToken>());
     }
 
     /// <summary>
diff --git a/dotnet/tests/Microsoft.Agents.AI.Declarative.UnitTests/AggregatorPromptAgentFactoryTests.cs b/dotnet/tests/Microsoft.Agents.AI.Declarative.UnitTests/AggregatorPromptAgentFactoryTests.cs
index 4a6709ac0a..ac0db2068d 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Declarative.UnitTests/AggregatorPromptAgentFactoryTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Declarative.UnitTests/AggregatorPromptAgentFactoryTests.cs
@@ -66,17 +66,17 @@ public TestAgentFactory(AIAgent? agentToReturn = null)
 
     private sealed class TestAgent : AIAgent
     {
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         {
             throw new NotImplementedException();
         }
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         {
             throw new NotImplementedException();
         }
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
         {
             throw new NotImplementedException();
         }
diff --git a/dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/AIAgentExtensionsTests.cs b/dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/AIAgentExtensionsTests.cs
index f98dc84c81..15a83ccd50 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/AIAgentExtensionsTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/AIAgentExtensionsTests.cs
@@ -175,7 +175,10 @@ private static Mock<AIAgent> CreateAgentMock(Action<AgentRunOptions?> optionsCal
     {
         Mock<AIAgent> agentMock = new() { CallBase = true };
         agentMock.SetupGet(x => x.Name).Returns("TestAgent");
-        agentMock.Setup(x => x.CreateSessionAsync()).ReturnsAsync(new TestAgentSession());
+        agentMock
+            .Protected()
+            .Setup<ValueTask<AgentSession>>("CreateSessionCoreAsync", ItExpr.IsAny<CancellationToken>())
+            .ReturnsAsync(new TestAgentSession());
         agentMock
             .Protected()
             .Setup<Task<AgentResponse>>("RunCoreAsync",
@@ -194,7 +197,10 @@ private static Mock<AIAgent> CreateAgentMockWithResponse(AgentResponse response)
     {
         Mock<AIAgent> agentMock = new() { CallBase = true };
         agentMock.SetupGet(x => x.Name).Returns("TestAgent");
-        agentMock.Setup(x => x.CreateSessionAsync()).ReturnsAsync(new TestAgentSession());
+        agentMock
+            .Protected()
+            .Setup<ValueTask<AgentSession>>("CreateSessionCoreAsync", ItExpr.IsAny<CancellationToken>())
+            .ReturnsAsync(new TestAgentSession());
         agentMock
             .Protected()
             .Setup<Task<AgentResponse>>("RunCoreAsync",
diff --git a/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/BasicStreamingTests.cs b/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/BasicStreamingTests.cs
index e8e5b7269c..a6e7aab212 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/BasicStreamingTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/BasicStreamingTests.cs
@@ -280,13 +280,13 @@ internal sealed class FakeChatClientAgent : AIAgent
 
     public override string? Description => "A fake agent for testing";
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) =>
         new(new FakeInMemoryAgentSession());
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
         new(new FakeInMemoryAgentSession(serializedState, jsonSerializerOptions));
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         => throw new NotImplementedException();
 
     protected override async Task<AgentResponse> RunCoreAsync(
@@ -347,13 +347,13 @@ internal sealed class FakeMultiMessageAgent : AIAgent
 
     public override string? Description => "A fake agent that sends multiple messages for testing";
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) =>
         new(new FakeInMemoryAgentSession());
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
         new(new FakeInMemoryAgentSession(serializedState, jsonSerializerOptions));
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         if (session is not FakeInMemoryAgentSession fakeSession)
         {
diff --git a/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/ForwardedPropertiesTests.cs b/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/ForwardedPropertiesTests.cs
index 1872b9fbef..afd3db44b3 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/ForwardedPropertiesTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/ForwardedPropertiesTests.cs
@@ -334,13 +334,13 @@ protected override async IAsyncEnumerable<AgentResponseUpdate> RunCoreStreamingA
         await Task.CompletedTask;
     }
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) =>
         new(new FakeInMemoryAgentSession());
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
         new(new FakeInMemoryAgentSession(serializedState, jsonSerializerOptions));
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         if (session is not FakeInMemoryAgentSession fakeSession)
         {
diff --git a/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/SharedStateTests.cs b/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/SharedStateTests.cs
index a20a7f6c04..b78ddd0e11 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/SharedStateTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/SharedStateTests.cs
@@ -417,13 +417,13 @@ stateObj is JsonElement state &&
         await Task.CompletedTask;
     }
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) =>
         new(new FakeInMemoryAgentSession());
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
         new(new FakeInMemoryAgentSession(serializedState, jsonSerializerOptions));
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         if (session is not FakeInMemoryAgentSession fakeSession)
         {
diff --git a/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.UnitTests/AGUIEndpointRouteBuilderExtensionsTests.cs b/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.UnitTests/AGUIEndpointRouteBuilderExtensionsTests.cs
index 896ba929cf..fecb9d421b 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.UnitTests/AGUIEndpointRouteBuilderExtensionsTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.UnitTests/AGUIEndpointRouteBuilderExtensionsTests.cs
@@ -425,13 +425,13 @@ private sealed class MultiResponseAgent : AIAgent
 
         public override string? Description => "Agent that produces multiple text chunks";
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) =>
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) =>
             new(new TestInMemoryAgentSession());
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
             new(new TestInMemoryAgentSession(serializedState, jsonSerializerOptions));
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         {
             if (session is not TestInMemoryAgentSession testSession)
             {
@@ -528,13 +528,13 @@ private sealed class TestAgent : AIAgent
 
         public override string? Description => "Test agent";
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) =>
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) =>
             new(new TestInMemoryAgentSession());
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
             new(new TestInMemoryAgentSession(serializedState, jsonSerializerOptions));
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         {
             if (session is not TestInMemoryAgentSession testSession)
             {
diff --git a/dotnet/tests/Microsoft.Agents.AI.Hosting.AzureFunctions.UnitTests/TestAgent.cs b/dotnet/tests/Microsoft.Agents.AI.Hosting.AzureFunctions.UnitTests/TestAgent.cs
index afacf590fb..10502c7edd 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Hosting.AzureFunctions.UnitTests/TestAgent.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Hosting.AzureFunctions.UnitTests/TestAgent.cs
@@ -11,12 +11,12 @@ internal sealed class TestAgent(string name, string description) : AIAgent
 
     public override string? Description => description;
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) => new(new DummyAgentSession());
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) => new(new DummyAgentSession());
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         => throw new NotImplementedException();
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(
         JsonElement serializedState,
         JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) => new(new DummyAgentSession());
 
diff --git a/dotnet/tests/Microsoft.Agents.AI.UnitTests/AgentExtensionsTests.cs b/dotnet/tests/Microsoft.Agents.AI.UnitTests/AgentExtensionsTests.cs
index a2bb76ea78..8ac1ab50da 100644
--- a/dotnet/tests/Microsoft.Agents.AI.UnitTests/AgentExtensionsTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.UnitTests/AgentExtensionsTests.cs
@@ -382,13 +382,13 @@ public TestAgent(string? name, string? description, Exception exceptionToThrow)
             this._exceptionToThrow = exceptionToThrow;
         }
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
             => throw new NotImplementedException();
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
         public override string? Name { get; }
diff --git a/dotnet/tests/Microsoft.Agents.AI.UnitTests/TestAIAgent.cs b/dotnet/tests/Microsoft.Agents.AI.UnitTests/TestAIAgent.cs
index db8f056218..0c91a75f13 100644
--- a/dotnet/tests/Microsoft.Agents.AI.UnitTests/TestAIAgent.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.UnitTests/TestAIAgent.cs
@@ -24,13 +24,13 @@ internal sealed class TestAIAgent : AIAgent
 
     public override string? Description => this.DescriptionFunc?.Invoke() ?? base.Description;
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         => throw new NotImplementedException();
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) =>
         new(this.DeserializeSessionFunc(serializedState, jsonSerializerOptions));
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) =>
         new(this.CreateSessionFunc());
 
     protected override Task<AgentResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default) =>
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/AgentWorkflowBuilderTests.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/AgentWorkflowBuilderTests.cs
index e58260c8b0..a21eda21c4 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/AgentWorkflowBuilderTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/AgentWorkflowBuilderTests.cs
@@ -135,13 +135,13 @@ private class DoubleEchoAgent(string name) : AIAgent
     {
         public override string Name => name;
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
             => new(new DoubleEchoAgentSession());
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
             => new(new DoubleEchoAgentSession());
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
             => default;
 
         protected override Task<AgentResponse> RunCoreAsync(
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/InProcessExecutionTests.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/InProcessExecutionTests.cs
index 8517d68023..f12ffc6988 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/InProcessExecutionTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/InProcessExecutionTests.cs
@@ -144,12 +144,12 @@ public SimpleTestAgent(string name)
 
         public override string Name { get; }
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) => new(new SimpleTestAgentSession());
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) => new(new SimpleTestAgentSession());
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(System.Text.Json.JsonElement serializedState,
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(System.Text.Json.JsonElement serializedState,
             System.Text.Json.JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default) => new(new SimpleTestAgentSession());
 
-        public override System.Text.Json.JsonElement SerializeSession(AgentSession session, System.Text.Json.JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override System.Text.Json.JsonElement SerializeSessionCore(AgentSession session, System.Text.Json.JsonSerializerOptions? jsonSerializerOptions = null)
             => default;
 
         protected override Task<AgentResponse> RunCoreAsync(
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RepresentationTests.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RepresentationTests.cs
index c76d7be1b5..5d38353fde 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RepresentationTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RepresentationTests.cs
@@ -24,13 +24,13 @@ private sealed class TestExecutor() : Executor("TestExecutor")
 
     private sealed class TestAgent : AIAgent
     {
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
             => throw new NotImplementedException();
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
             => throw new NotImplementedException();
 
         protected override Task<AgentResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default) =>
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RoleCheckAgent.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RoleCheckAgent.cs
index 190f572582..48fc432eeb 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RoleCheckAgent.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RoleCheckAgent.cs
@@ -16,13 +16,13 @@ internal sealed class RoleCheckAgent(bool allowOtherAssistantRoles, string? id =
 
     public override string? Name => name;
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         => new(new RoleCheckAgentSession());
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         => default;
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) => new(new RoleCheckAgentSession());
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) => new(new RoleCheckAgentSession());
 
     protected override Task<AgentResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)
         => this.RunStreamingAsync(messages, session, options, cancellationToken).ToAgentResponseAsync(cancellationToken);
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/Sample/06_GroupChat_Workflow.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/Sample/06_GroupChat_Workflow.cs
index f29c39a981..e4c905f814 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/Sample/06_GroupChat_Workflow.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/Sample/06_GroupChat_Workflow.cs
@@ -60,13 +60,13 @@ internal sealed class HelloAgent(string id = nameof(HelloAgent)) : AIAgent
     protected override string? IdCore => id;
     public override string? Name => id;
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
         => new(new HelloAgentSession());
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         => new(new HelloAgentSession());
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         => default;
 
     protected override async Task<AgentResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestEchoAgent.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestEchoAgent.cs
index d66443f069..088c862efa 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestEchoAgent.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestEchoAgent.cs
@@ -16,12 +16,12 @@ internal class TestEchoAgent(string? id = null, string? name = null, string? pre
     protected override string? IdCore => id;
     public override string? Name => name ?? base.Name;
 
-    public override async ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override async ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
     {
         return serializedState.Deserialize<EchoAgentSession>(jsonSerializerOptions) ?? await this.CreateSessionAsync(cancellationToken);
     }
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
     {
         if (session is not EchoAgentSession typedSession)
         {
@@ -31,7 +31,7 @@ public override JsonElement SerializeSession(AgentSession session, JsonSerialize
         return typedSession.Serialize(jsonSerializerOptions);
     }
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default) =>
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default) =>
         new(new EchoAgentSession());
 
     private static ChatMessage UpdateSession(ChatMessage message, InMemoryAgentSession? session = null)
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestReplayAgent.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestReplayAgent.cs
index 065c751679..032ba9001c 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestReplayAgent.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestReplayAgent.cs
@@ -45,13 +45,13 @@ static ChatMessage ToMessage(string text)
         return result;
     }
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
         => new(new ReplayAgentSession());
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         => new(new ReplayAgentSession());
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         => default;
 
     public static TestReplayAgent FromStrings(params string[] messages) =>
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestRequestAgent.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestRequestAgent.cs
index 6bed1e1649..63cd8dd6f0 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestRequestAgent.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestRequestAgent.cs
@@ -29,7 +29,7 @@ internal sealed class TestRequestAgent(TestAgentRequestType requestType, int unp
     protected override string? IdCore => id;
     public override string? Name => name;
 
-    public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken)
+    protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken)
         => new(requestType switch
         {
             TestAgentRequestType.FunctionCall => new TestRequestAgentSession<FunctionCallContent, FunctionResultContent>(),
@@ -37,7 +37,7 @@ public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken can
             _ => throw new NotSupportedException(),
         });
 
-    public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+    protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         => new(requestType switch
         {
             TestAgentRequestType.FunctionCall => new TestRequestAgentSession<FunctionCallContent, FunctionResultContent>(),
@@ -45,7 +45,7 @@ public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement seri
             _ => throw new NotSupportedException(),
         });
 
-    public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+    protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
         => default;
 
     protected override Task<AgentResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/WorkflowHostSmokeTests.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/WorkflowHostSmokeTests.cs
index 276c0c3973..ac6485131d 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/WorkflowHostSmokeTests.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/WorkflowHostSmokeTests.cs
@@ -41,17 +41,17 @@ public Session(JsonElement serializedSession, JsonSerializerOptions? jsonSeriali
             { }
         }
 
-        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
         {
             return new(new Session(serializedState, jsonSerializerOptions));
         }
 
-        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+        protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
         {
             return new(new Session());
         }
 
-        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+        protected override JsonElement SerializeSessionCore(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
             => default;
 
         protected override async Task<AgentResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)