Add ToolAnnotations support (#124)

* Add ToolAnnotations support

* Address feedback

src/ModelContextProtocol/Server/McpServerToolCreateOptions.cs

@@ -0,0 +1,76 @@
+using System.ComponentModel;
+
+namespace ModelContextProtocol.Server;
+
+/// <summary>Provides options for controlling the creation of an <see cref="McpServerTool"/>.</summary>
+public sealed class McpServerToolCreateOptions
+{
+    /// <summary>
+    /// Gets or sets optional services used in the construction of the <see cref="McpServerTool"/>.
+    /// </summary>
+    /// <remarks>
+    /// These services will be used to determine which parameters should be satisifed from dependency injection; what services
+    /// are satisfied via this provider should match what's satisfied via the provider passed in at invocation time.
+    /// </remarks>
+    public IServiceProvider? Services { get; set; }
+
+    /// <summary>
+    /// Gets or sets the name to use for the <see cref="McpServerTool"/>.
+    /// </summary>
+    /// <remarks>
+    /// If <see langword="null"/>, but an <see cref="McpServerToolAttribute"/> is applied to the method,
+    /// the name from the attribute will be used. If that's not present, a name based on the method's name will be used.
+    /// </remarks>
+    public string? Name { get; set; }
+
+    /// <summary>
+    /// Gets or set the description to use for the <see cref="McpServerTool"/>.
+    /// </summary>
+    /// <remarks>
+    /// If <see langword="null"/>, but a <see cref="DescriptionAttribute"/> is applied to the method,
+    /// the description from that attribute will be used.
+    /// </remarks>
+    public string? Description { get; set; }
+
+    /// <summary>
+    /// Gets or sets a human-readable title for the tool.
+    /// </summary>
+    public string? Title { get; set; }
+
+    /// <summary>
+    /// Gets or sets whether the tool may perform destructive updates to its environment.
+    /// </summary>
+    public bool? Destructive { get; set; }
+
+    /// <summary>
+    /// Gets or sets whether calling the tool repeatedly with the same arguments 
+    /// will have no additional effect on its environment.
+    /// </summary>
+    public bool? Idempotent { get; set; }
+
+    /// <summary>
+    /// Gets or sets whether this tool may interact with an "open world" of external entities.
+    /// </summary>
+    public bool? OpenWorld { get; set; }
+
+    /// <summary>
+    /// Gets or sets whether this tool does not modify its environment.
+    /// </summary>
+    public bool? ReadOnly { get; set; }
+
+    /// <summary>
+    /// Creates a shallow clone of the current <see cref="McpServerToolCreateOptions"/> instance.
+    /// </summary>
+    internal McpServerToolCreateOptions Clone() =>
+        new McpServerToolCreateOptions()
+        {
+            Services = Services,
+            Name = Name,
+            Description = Description,
+            Title = Title,
+            Destructive = Destructive,
+            Idempotent = Idempotent,
+            OpenWorld = OpenWorld,
+            ReadOnly = ReadOnly
+        };
+}