From 59c3d9b52659f448167a2eb72cd2092dd740476c Mon Sep 17 00:00:00 2001
From: Mike Kistler <mikekistler@microsoft.com>
Date: Tue, 25 Nov 2025 11:22:02 -0800
Subject: [PATCH] Helper method to merge additional metadata into requests,
 results, and notifications

---
 .../Protocol/NotificationParams.cs              | 17 +++++++++++++++++
 .../Protocol/RequestParams.cs                   | 17 +++++++++++++++++
 .../Protocol/Result.cs                          | 17 +++++++++++++++++
 3 files changed, 51 insertions(+)

diff --git a/src/ModelContextProtocol.Core/Protocol/NotificationParams.cs b/src/ModelContextProtocol.Core/Protocol/NotificationParams.cs
index 54432a4c2..49899aa83 100644
--- a/src/ModelContextProtocol.Core/Protocol/NotificationParams.cs
+++ b/src/ModelContextProtocol.Core/Protocol/NotificationParams.cs
@@ -21,4 +21,21 @@ private protected NotificationParams()
     /// </remarks>
     [JsonPropertyName("_meta")]
     public JsonObject? Meta { get; set; }
+
+    /// <summary>
+    /// Merges additional metadata into the existing Meta object.
+    /// </summary>
+    /// <param name="additionalMeta">The additional metadata to merge.</param>
+    public void MergeMeta(JsonObject additionalMeta)
+    {
+        if (Meta == null)
+        {
+            Meta = new JsonObject();
+        }
+
+        foreach (var kvp in additionalMeta)
+        {
+            Meta[kvp.Key] = kvp.Value;
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/ModelContextProtocol.Core/Protocol/RequestParams.cs b/src/ModelContextProtocol.Core/Protocol/RequestParams.cs
index b45f55f7a..4d2ced308 100644
--- a/src/ModelContextProtocol.Core/Protocol/RequestParams.cs
+++ b/src/ModelContextProtocol.Core/Protocol/RequestParams.cs
@@ -65,4 +65,21 @@ public ProgressToken? ProgressToken
             }
         }
     }
+
+    /// <summary>
+    /// Merges additional metadata into the existing Meta object.
+    /// </summary>
+    /// <param name="additionalMeta">The additional metadata to merge.</param>
+    public void MergeMeta(JsonObject additionalMeta)
+    {
+        if (Meta == null)
+        {
+            Meta = new JsonObject();
+        }
+
+        foreach (var kvp in additionalMeta)
+        {
+            Meta[kvp.Key] = kvp.Value;
+        }
+    }
 }
diff --git a/src/ModelContextProtocol.Core/Protocol/Result.cs b/src/ModelContextProtocol.Core/Protocol/Result.cs
index 58b076ddb..fd984da2b 100644
--- a/src/ModelContextProtocol.Core/Protocol/Result.cs
+++ b/src/ModelContextProtocol.Core/Protocol/Result.cs
@@ -21,4 +21,21 @@ private protected Result()
     /// </remarks>
     [JsonPropertyName("_meta")]
     public JsonObject? Meta { get; set; }
+
+    /// <summary>
+    /// Merges additional metadata into the existing Meta object.
+    /// </summary>
+    /// <param name="additionalMeta">The additional metadata to merge.</param>
+    public void MergeMeta(JsonObject additionalMeta)
+    {
+        if (Meta == null)
+        {
+            Meta = new JsonObject();
+        }
+
+        foreach (var kvp in additionalMeta)
+        {
+            Meta[kvp.Key] = kvp.Value;
+        }
+    }
 }