Completion support (#15)

src/mcpdotnet/Protocol/Types/Completion.cs

@@ -0,0 +1,27 @@
+using System.Text.Json.Serialization;
+
+namespace McpDotNet.Protocol.Types;
+
+/// <summary>
+/// Represents a completion object in the server's response.
+/// </summary>
+public class Completion
+{
+    /// <summary>
+    /// An array of completion values. Must not exceed 100 items.
+    /// </summary>
+    [JsonPropertyName("values")]
+    public string[] Values { get; set; } = new string[0];
+
+    /// <summary>
+    /// The total number of completion options available. This can exceed the number of values actually sent in the response.
+    /// </summary>
+    [JsonPropertyName("total")]
+    public int? Total { get; set; }
+
+    /// <summary>
+    /// Indicates whether there are additional completion options beyond those provided in the current response, even if the exact total is unknown.
+    /// </summary>
+    [JsonPropertyName("hasMore")]
+    public bool? HasMore { get; set; }
+}