Add ModelContextProtocol.Core package (#428)

src/ModelContextProtocol/Protocol/Tool.cs

@@ -1,78 +0,0 @@
-using System.Text.Json;
-using System.Text.Json.Serialization;
-
-namespace ModelContextProtocol.Protocol;
-
-/// <summary>
-/// Represents a tool that the server is capable of calling.
-/// </summary>
-public class Tool
-{
-    private JsonElement _inputSchema = McpJsonUtilities.DefaultMcpToolSchema;
-
-    /// <summary>
-    /// Gets or sets the name of the tool.
-    /// </summary>
-    [JsonPropertyName("name")]
-    public string Name { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Gets or sets a human-readable description of the tool.
-    /// </summary>
-    /// <remarks>
-    /// <para>
-    /// This description helps the AI model understand what the tool does and when to use it.
-    /// It should be clear, concise, and accurately describe the tool's purpose and functionality.
-    /// </para>
-    /// <para>
-    /// The description is typically presented to AI models to help them determine when
-    /// and how to use the tool based on user requests.
-    /// </para>
-    /// </remarks>
-    [JsonPropertyName("description")]
-    public string? Description { get; set; }
-
-    /// <summary>
-    /// Gets or sets a JSON Schema object defining the expected parameters for the tool.
-    /// </summary>
-    /// <remarks>
-    /// <para>
-    /// The schema must be a valid JSON Schema object with the "type" property set to "object".
-    /// This is enforced by validation in the setter which will throw an <see cref="ArgumentException"/>
-    /// if an invalid schema is provided.
-    /// </para>
-    /// <para>
-    /// The schema typically defines the properties (parameters) that the tool accepts, 
-    /// their types, and which ones are required. This helps AI models understand
-    /// how to structure their calls to the tool.
-    /// </para>
-    /// <para>
-    /// If not explicitly set, a default minimal schema of <c>{"type":"object"}</c> is used.
-    /// </para>
-    /// </remarks>
-    [JsonPropertyName("inputSchema")]
-    public JsonElement InputSchema  
-    { 
-        get => _inputSchema; 
-        set
-        {
-            if (!McpJsonUtilities.IsValidMcpToolSchema(value))
-            {
-                throw new ArgumentException("The specified document is not a valid MCP tool JSON schema.", nameof(InputSchema));
-            }
-
-            _inputSchema = value;
-        }
-    }
-
-    /// <summary>
-    /// Gets or sets optional additional tool information and behavior hints.
-    /// </summary>
-    /// <remarks>
-    /// These annotations provide metadata about the tool's behavior, such as whether it's read-only,
-    /// destructive, idempotent, or operates in an open world. They also can include a human-readable title.
-    /// Note that these are hints and should not be relied upon for security decisions.
-    /// </remarks>
-    [JsonPropertyName("annotations")]
-    public ToolAnnotations? Annotations { get; set; }
-}