Add ModelContextProtocol.Core package (#428)

src/ModelContextProtocol.Core/Protocol/CallToolRequestParams.cs

@@ -0,0 +1,28 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.Protocol;
+
+/// <summary>
+/// Represents the parameters used with a <see cref="RequestMethods.ToolsCall"/> request from a client to invoke a tool provided by the server.
+/// </summary>
+/// <remarks>
+/// The server will respond with a <see cref="CallToolResponse"/> containing the result of the tool invocation.
+/// See the <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/">schema</see> for details.
+/// </remarks>
+public class CallToolRequestParams : RequestParams
+{
+    /// <summary>Gets or sets the name of the tool to invoke.</summary>
+    [JsonPropertyName("name")]
+    public required string Name { get; init; }
+
+    /// <summary>
+    /// Gets or sets optional arguments to pass to the tool when invoking it on the server.
+    /// </summary>
+    /// <remarks>
+    /// This dictionary contains the parameter values to be passed to the tool. Each key-value pair represents 
+    /// a parameter name and its corresponding argument value.
+    /// </remarks>
+    [JsonPropertyName("arguments")]
+    public IReadOnlyDictionary<string, JsonElement>? Arguments { get; init; }
+}