Initial commit

src/mcpdotnet/Utils/Json/JsonSerializerOptionsExtensions.cs

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+namespace McpDotNet.Utils.Json;
+
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+/// <summary>
+/// Extensions for configuring System.Text.Json serialization options for MCP.
+/// </summary>
+public static class JsonSerializerOptionsExtensions
+{
+    /// <summary>
+    /// Configures JsonSerializerOptions with MCP-specific settings and converters.
+    /// </summary>
+    /// <param name="options">The options to configure.</param>
+    /// <returns>The configured options.</returns>
+    public static JsonSerializerOptions ConfigureForMcp(this JsonSerializerOptions options)
+    {
+        // Add custom converters
+        options.Converters.Add(new JsonRpcMessageConverter());
+        options.Converters.Add(new ContentJsonConverter());
+        options.Converters.Add(new ResourceContentsJsonConverter());
+        options.Converters.Add(new JsonStringEnumConverter());
+
+        // Configure general options
+        options.PropertyNameCaseInsensitive = true;
+        options.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
+        options.NumberHandling = JsonNumberHandling.AllowReadingFromString;
+
+        return options;
+    }
+}