diff --git a/DurableMultiAgentTemplate.Shared/Model/AdditionalLinkInfo.cs b/DurableMultiAgentTemplate.Shared/Model/AdditionalLinkInfo.cs
index 2e936b8..f6931fe 100644
--- a/DurableMultiAgentTemplate.Shared/Model/AdditionalLinkInfo.cs
+++ b/DurableMultiAgentTemplate.Shared/Model/AdditionalLinkInfo.cs
@@ -2,6 +2,10 @@
 
 namespace DurableMultiAgentTemplate.Shared.Model;
 
+/// <summary>
+/// Record representing additional information in link format.
+/// Used when providing links as additional information in agent responses.
+/// </summary>
 public record AdditionalLinkInfo(
     [property: Description("リンクのラベルとして表示されるテキスト")]
     string LinkText,
diff --git a/DurableMultiAgentTemplate.Shared/Model/AdditionalMarkdownInfo.cs b/DurableMultiAgentTemplate.Shared/Model/AdditionalMarkdownInfo.cs
index 8015a82..84602dd 100644
--- a/DurableMultiAgentTemplate.Shared/Model/AdditionalMarkdownInfo.cs
+++ b/DurableMultiAgentTemplate.Shared/Model/AdditionalMarkdownInfo.cs
@@ -2,6 +2,10 @@
 
 namespace DurableMultiAgentTemplate.Shared.Model;
 
+/// <summary>
+/// Record representing additional information in Markdown format.
+/// Used when providing Markdown text as additional information in agent responses.
+/// </summary>
 public record AdditionalMarkdownInfo(
     [property: Description("Markdown形式の補足情報")]
     string MarkdownText) : IAdditionalInfo;
diff --git a/DurableMultiAgentTemplate.Shared/Model/IAdditionalInfo.cs b/DurableMultiAgentTemplate.Shared/Model/IAdditionalInfo.cs
index 7c57859..6bee665 100644
--- a/DurableMultiAgentTemplate.Shared/Model/IAdditionalInfo.cs
+++ b/DurableMultiAgentTemplate.Shared/Model/IAdditionalInfo.cs
@@ -2,6 +2,10 @@
 
 namespace DurableMultiAgentTemplate.Shared.Model;
 
+/// <summary>
+/// Interface for additional information.
+/// Classes implementing this interface are used as supplementary information added to agent responses.
+/// </summary>
 [JsonDerivedType(typeof(AdditionalMarkdownInfo), typeDiscriminator: "markdown")]
 [JsonDerivedType(typeof(AdditionalLinkInfo), typeDiscriminator: "link")]
 public interface IAdditionalInfo;
diff --git a/DurableMultiAgentTemplate/Agent/AgentActivityName.cs b/DurableMultiAgentTemplate/Agent/AgentActivityName.cs
index 21d261b..b6b3cea 100644
--- a/DurableMultiAgentTemplate/Agent/AgentActivityName.cs
+++ b/DurableMultiAgentTemplate/Agent/AgentActivityName.cs
@@ -1,5 +1,9 @@
 namespace DurableMultiAgentTemplate.Agent;
 
+/// <summary>
+/// Static class defining agent activity names.
+/// Provides constants for orchestrator agent and worker agent names.
+/// </summary>
 public static class AgentActivityName
 {
     // Orchestrator Agent functions
diff --git a/DurableMultiAgentTemplate/Agent/AgentDefinition.cs b/DurableMultiAgentTemplate/Agent/AgentDefinition.cs
index e6c2767..7ba118f 100644
--- a/DurableMultiAgentTemplate/Agent/AgentDefinition.cs
+++ b/DurableMultiAgentTemplate/Agent/AgentDefinition.cs
@@ -4,6 +4,10 @@
 
 namespace DurableMultiAgentTemplate.Agent;
 
+/// <summary>
+/// Class providing agent definitions.
+/// Defines the functionality, descriptions, and parameters for each agent.
+/// </summary>
 //https://learn.microsoft.com/ja-jp/azure/ai-services/openai/how-to/dotnet-migration?tabs=stable
 internal class AgentDefinition
 {
diff --git a/DurableMultiAgentTemplate/Agent/Synthesizer/SynthesizerWithAdditionalInfoPrompt.cs b/DurableMultiAgentTemplate/Agent/Synthesizer/SynthesizerWithAdditionalInfoPrompt.cs
index 34d621e..4cd5835 100644
--- a/DurableMultiAgentTemplate/Agent/Synthesizer/SynthesizerWithAdditionalInfoPrompt.cs
+++ b/DurableMultiAgentTemplate/Agent/Synthesizer/SynthesizerWithAdditionalInfoPrompt.cs
@@ -1,5 +1,9 @@
 namespace DurableMultiAgentTemplate.Agent.Synthesizer;
 
+/// <summary>
+/// Static class defining prompts for generating responses with additional information.
+/// The system prompt includes instructions on how to generate responses and separate additional information.
+/// </summary>
 internal static class SynthesizerWithAdditionalInfoPrompt
 {
     // Orchestrator Agent functions
diff --git a/DurableMultiAgentTemplate/Starter.cs b/DurableMultiAgentTemplate/Starter.cs
index dedd683..f66e00c 100644
--- a/DurableMultiAgentTemplate/Starter.cs
+++ b/DurableMultiAgentTemplate/Starter.cs
@@ -8,6 +8,10 @@
 
 namespace DurableMultiAgentTemplate;
 
+/// <summary>
+/// Class providing starter functions for agent orchestration.
+/// Provides synchronous and asynchronous HTTP triggers to start agent orchestration.
+/// </summary>
 public class Starter(ILogger<Starter> logger)
 {
     private static readonly JsonSerializerOptions _jsonSerializerOptions = new()
@@ -15,6 +19,12 @@ public class Starter(ILogger<Starter> logger)
         PropertyNameCaseInsensitive = true
     };
 
+    /// <summary>
+    /// Synchronously executes agent orchestration and waits for completion. HTTP trigger function.
+    /// </summary>
+    /// <param name="req">HTTP request data</param>
+    /// <param name="client">Durable task client</param>
+    /// <returns>HTTP response containing agent processing results</returns>
     [Function("SyncStarter")]
     public async Task<HttpResponseData> SyncStarter(
         [HttpTrigger(AuthorizationLevel.Function, "post", Route = "invoke/sync")] HttpRequestData req,
@@ -41,6 +51,12 @@ public async Task<HttpResponseData> SyncStarter(
         return res;
     }
 
+    /// <summary>
+    /// Asynchronously starts agent orchestration. HTTP trigger function.
+    /// </summary>
+    /// <param name="req">HTTP request data</param>
+    /// <param name="client">Durable task client</param>
+    /// <returns>HTTP response containing URLs for checking orchestration status</returns>
     [Function("AsyncStarter")]
     public async Task<HttpResponseData> AsyncStarter(
         [HttpTrigger(AuthorizationLevel.Function, "post", Route = "invoke/async")] HttpRequestData req,
@@ -63,6 +79,11 @@ public async Task<HttpResponseData> AsyncStarter(
         return await client.CreateCheckStatusResponseAsync(req, instanceId);
     }
 
+    /// <summary>
+    /// Helper method to retrieve agent request data from an HTTP request.
+    /// </summary>
+    /// <param name="req">HTTP request data</param>
+    /// <returns>Agent request data, or null if the request is invalid</returns>
     private async Task<AgentRequestDto?> GetRequestData(HttpRequestData req)
     {
         var requestBody = await req.ReadAsStringAsync();