Fix CreateMessageRequestParams.Metadata type to JsonObject (#1354)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
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Copilot 2026-02-23 18:08:03 -05:00 • committed by GitHub
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@ -1,5 +1,5 @@
using System.Diagnostics.CodeAnalysis;
using System.Text.Json;
using System.Text.Json.Nodes;
using System.Text.Json.Serialization;
namespace ModelContextProtocol.Protocol;
@ -68,7 +68,7 @@ public sealed class CreateMessageRequestParams : RequestParams
/// </para>
/// </remarks>
[JsonPropertyName("metadata")]
public JsonElement? Metadata { get; set; }
public JsonObject? Metadata { get; set; }
/// <summary>
/// Gets or sets the server's preferences for which model to select.