addressing feedback

Anthropic.SDK.Tests/CacheControlTests.cs

@@ -495,7 +495,7 @@ public async Task TestCacheControlOfAssistantMessages()
                 new SystemMessage(content, new CacheControl()
                 {
                     Type = CacheControlType.ephemeral,
-                    TTL = CacheControl.CacheDuration1Hour,
+                    TTL = CacheDuration.OneHour,
                 })
             };
             var parameters = new MessageParameters()
@@ -517,7 +517,7 @@ public async Task TestCacheControlOfAssistantMessages()
             res.Message.Content.First().CacheControl = new CacheControl()
             {
                 Type = CacheControlType.ephemeral,
-                TTL = CacheControl.CacheDuration1Hour,
+                TTL = CacheDuration.OneHour,
             };
 
             messages.Add(res.Message);

Anthropic.SDK.Tests/DocumentTests.cs

@@ -36,7 +36,7 @@ public async Task TestPDF()
                     CacheControl = new CacheControl()
                     {
                         Type = CacheControlType.ephemeral,
-                        TTL = CacheControl.CacheDuration5Minutes,
+                        TTL = CacheDuration.FiveMinutes,
                     }
                 }),
                 new Message(RoleType.User, "Which model has the highest human preference win rates across each use-case?"),

Anthropic.SDK/Messaging/CacheControl.cs

@@ -4,9 +4,6 @@ namespace Anthropic.SDK.Messaging;
 
 public class CacheControl
 {
-    public static string CacheDuration5Minutes = "5m";
-    public static string CacheDuration1Hour = "1h";
-
     [JsonPropertyName("type")]
     public CacheControlType Type { get; set; }
 
@@ -15,7 +12,8 @@ public class CacheControl
     /// Supported values are <see cref="CacheDuration5Minutes"/> or <see cref="CacheDuration1Hour"/>
     /// </summary>
     [JsonPropertyName("ttl")]
-    public string TTL { get; set; }
+    [JsonConverter(typeof(CacheDurationConverter))]
+    public CacheDuration TTL { get; set; }
 }
 
 [JsonConverter(typeof(JsonStringEnumConverter))]

Anthropic.SDK/Messaging/CacheDurationConverter.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Anthropic.SDK.Messaging;
+
+public enum CacheDuration
+{
+    FiveMinutes,
+    OneHour
+}
+
+public class CacheDurationConverter : JsonConverter<CacheDuration>
+{
+    public override CacheDuration Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        string? value = reader.GetString();
+        return value switch
+        {
+            "5m" => CacheDuration.FiveMinutes,
+            "1h" => CacheDuration.OneHour,
+            _ => throw new JsonException($"Invalid cache duration: {value}")
+        };
+    }
+
+    public override void Write(Utf8JsonWriter writer, CacheDuration value, JsonSerializerOptions options)
+    {
+        string str = value switch
+        {
+            CacheDuration.FiveMinutes => "5m",
+            CacheDuration.OneHour => "1h",
+            _ => throw new JsonException($"Invalid cache duration enum: {value}")
+        };
+        writer.WriteStringValue(str);
+    }
+}