From 305bc1c5f01ca183525f598c5a9c8651bf6a24bb Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 12 Dec 2025 13:14:30 +0000
Subject: [PATCH 1/3] Initial plan


From 5ecf5573ad65248ac85bffadd57270158a6ce939 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 12 Dec 2025 13:24:57 +0000
Subject: [PATCH 2/3] Fix Icon.Theme documentation to remove "custom theme
 identifier" per MCP spec

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
---
 src/ModelContextProtocol.Core/Protocol/Icon.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/ModelContextProtocol.Core/Protocol/Icon.cs b/src/ModelContextProtocol.Core/Protocol/Icon.cs
index 0ae9add9..dc260c05 100644
--- a/src/ModelContextProtocol.Core/Protocol/Icon.cs
+++ b/src/ModelContextProtocol.Core/Protocol/Icon.cs
@@ -79,8 +79,9 @@ public sealed class Icon
     /// Gets or sets the optional theme for this icon.
     /// </summary>
     /// <remarks>
-    /// Can be "light", "dark", or a custom theme identifier.
-    /// The value is used to specify which UI theme the icon is designed for.
+    /// Can be "light" or "dark". "light" indicates the icon is designed to be used with a light
+    /// background, and "dark" indicates the icon is designed to be used with a dark background.
+    /// If not provided, clients should assume the icon can be used with any theme.
     /// </remarks>
     [JsonPropertyName("theme")]
     public string? Theme { get; set; }

From 475becb5c7d80001641f8137a2fa7a55b184e0a5 Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Fri, 12 Dec 2025 08:30:10 -0500
Subject: [PATCH 3/3] Update src/ModelContextProtocol.Core/Protocol/Icon.cs

---
 src/ModelContextProtocol.Core/Protocol/Icon.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ModelContextProtocol.Core/Protocol/Icon.cs b/src/ModelContextProtocol.Core/Protocol/Icon.cs
index dc260c05..e187f191 100644
--- a/src/ModelContextProtocol.Core/Protocol/Icon.cs
+++ b/src/ModelContextProtocol.Core/Protocol/Icon.cs
@@ -79,7 +79,7 @@ public sealed class Icon
     /// Gets or sets the optional theme for this icon.
     /// </summary>
     /// <remarks>
-    /// Can be "light" or "dark". "light" indicates the icon is designed to be used with a light
+    /// <see cref="Theme"/> may be "light" or "dark". "light" indicates the icon is designed to be used with a light
     /// background, and "dark" indicates the icon is designed to be used with a dark background.
     /// If not provided, clients should assume the icon can be used with any theme.
     /// </remarks>