Clean up namespaces (#410)

No meaningful code changes, just lots of namespace shuffling to have fewer namespaces and to put things in better namespaces.

src/ModelContextProtocol/Protocol/PromptsCapability.cs

@@ -0,0 +1,82 @@
+using ModelContextProtocol.Server;
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.Protocol;
+
+/// <summary>
+/// Represents the server's capability to provide predefined prompt templates that clients can use.
+/// </summary>
+/// <remarks>
+/// <para>
+/// The prompts capability allows a server to expose a collection of predefined prompt templates that clients
+/// can discover and use. These prompts can be static (defined in the <see cref="PromptCollection"/>) or
+/// dynamically generated through handlers.
+/// </para>
+/// <para>
+/// See the <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/">schema</see> for details.
+/// </para>
+/// </remarks>
+public class PromptsCapability
+{
+    /// <summary>
+    /// Gets or sets whether this server supports notifications for changes to the prompt list.
+    /// </summary>
+    /// <remarks>
+    /// When set to <see langword="true"/>, the server will send notifications using 
+    /// <see cref="NotificationMethods.PromptListChangedNotification"/> when prompts are added, 
+    /// removed, or modified. Clients can register handlers for these notifications to
+    /// refresh their prompt cache. This capability enables clients to stay synchronized with server-side changes 
+    /// to available prompts.
+    /// </remarks>
+    [JsonPropertyName("listChanged")]
+    public bool? ListChanged { get; set; }
+
+    /// <summary>
+    /// Gets or sets the handler for <see cref="RequestMethods.PromptsList"/> requests.
+    /// </summary>
+    /// <remarks>
+    /// This handler is invoked when a client requests a list of available prompts from the server
+    /// via a <see cref="RequestMethods.PromptsList"/> request. Results from this handler are returned
+    /// along with any prompts defined in <see cref="PromptCollection"/>.
+    /// </remarks>
+    [JsonIgnore]
+    public Func<RequestContext<ListPromptsRequestParams>, CancellationToken, ValueTask<ListPromptsResult>>? ListPromptsHandler { get; set; }
+
+    /// <summary>
+    /// Gets or sets the handler for <see cref="RequestMethods.PromptsGet"/> requests.
+    /// </summary>
+    /// <remarks>
+    /// <para>
+    /// This handler is invoked when a client requests details for a specific prompt by name and provides arguments 
+    /// for the prompt if needed. The handler receives the request context containing the prompt name and any arguments, 
+    /// and should return a <see cref="GetPromptResult"/> with the prompt messages and other details.
+    /// </para>
+    /// <para>
+    /// This handler will be invoked if the requested prompt name is not found in the <see cref="PromptCollection"/>,
+    /// allowing for dynamic prompt generation or retrieval from external sources.
+    /// </para>
+    /// </remarks>
+    [JsonIgnore]
+    public Func<RequestContext<GetPromptRequestParams>, CancellationToken, ValueTask<GetPromptResult>>? GetPromptHandler { get; set; }
+
+    /// <summary>
+    /// Gets or sets a collection of prompts that will be served by the server.
+    /// </summary>
+    /// <remarks>
+    /// <para>
+    /// The <see cref="PromptCollection"/> contains the predefined prompts that clients can request from the server.
+    /// This collection works in conjunction with <see cref="ListPromptsHandler"/> and <see cref="GetPromptHandler"/>
+    /// when those are provided:
+    /// </para>
+    /// <para>
+    /// - For <see cref="RequestMethods.PromptsList"/> requests: The server returns all prompts from this collection 
+    ///   plus any additional prompts provided by the <see cref="ListPromptsHandler"/> if it's set.
+    /// </para>
+    /// <para>
+    /// - For <see cref="RequestMethods.PromptsGet"/> requests: The server first checks this collection for the requested prompt.
+    ///   If not found, it will invoke the <see cref="GetPromptHandler"/> as a fallback if one is set.
+    /// </para>
+    /// </remarks>
+    [JsonIgnore]
+    public McpServerPrimitiveCollection<McpServerPrompt>? PromptCollection { get; set; }
+}