Add ModelContextProtocol.Core package (#428)

src/ModelContextProtocol.Core/Protocol/ElicitResult.cs

@@ -0,0 +1,41 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.Protocol;
+
+/// <summary>
+/// Represents the client's response to an elicitation request.
+/// </summary>
+public class ElicitResult
+{
+    /// <summary>
+    /// Gets or sets the user action in response to the elicitation.
+    /// </summary>
+    /// <remarks>
+    /// <list type="bullet">
+    ///   <item>
+    ///     <term>"accept"</term>
+    ///     <description>User submitted the form/confirmed the action</description>
+    ///   </item>
+    ///   <item>
+    ///     <term>"decline"</term>
+    ///     <description>User explicitly declined the action</description>
+    ///   </item>
+    ///   <item>
+    ///     <term>"cancel"</term>
+    ///     <description>User dismissed without making an explicit choice</description>
+    ///   </item>
+    /// </list>
+    /// </remarks>
+    [JsonPropertyName("action")]
+    public string Action { get; set; } = "cancel";
+
+    /// <summary>
+    /// Gets or sets the submitted form data.
+    /// </summary>
+    /// <remarks>
+    /// This is typically omitted if the action is "cancel" or "decline".
+    /// </remarks>
+    [JsonPropertyName("content")]
+    public JsonElement? Content { get; set; }
+}