diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index af782d718..ced4fd771 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -39,7 +39,7 @@ END TEMPLATE-->
 
 ### New features
 
-*None yet*
+* Added `IPrototypeManager.IsIgnored()` for checking whether a given prototype kind has been marked as ignored via `RegisterIgnore()`.
 
 ### Bugfixes
 
@@ -47,7 +47,7 @@ END TEMPLATE-->
 
 ### Other
 
-*None yet*
+* The yaml prototype id serialiser now provides better feedback when trying to validate an id for a prototype kind that has been ignored via `IPrototypeManager.RegisterIgnore()`
 
 ### Internal
 
diff --git a/Robust.Shared/Prototypes/IPrototypeManager.cs b/Robust.Shared/Prototypes/IPrototypeManager.cs
index 0b7b67e24..30950068c 100644
--- a/Robust.Shared/Prototypes/IPrototypeManager.cs
+++ b/Robust.Shared/Prototypes/IPrototypeManager.cs
@@ -306,6 +306,11 @@ public interface IPrototypeManager
     /// </summary>
     void RegisterIgnore(string name);
 
+    /// <summary>
+    /// Checks whether the given gind name has been marked as ignored via <see cref="RegisterIgnore"/>
+    /// </summary>
+    bool IsIgnored(string name);
+
     /// <summary>
     /// Loads several prototype kinds into the manager. Note that this will re-build a frozen dictionary and should be avoided if possible.
     /// </summary>
diff --git a/Robust.Shared/Prototypes/PrototypeManager.cs b/Robust.Shared/Prototypes/PrototypeManager.cs
index 044c8d6ee..8efe3f258 100644
--- a/Robust.Shared/Prototypes/PrototypeManager.cs
+++ b/Robust.Shared/Prototypes/PrototypeManager.cs
@@ -920,6 +920,8 @@ namespace Robust.Shared.Prototypes
             return TryGetKindFrom(typeof(T), out kind);
         }
 
+        public bool IsIgnored(string name) => _ignoredPrototypeTypes.Contains(name);
+
         /// <inheritdoc />
         public void RegisterIgnore(string name)
         {
@@ -973,6 +975,17 @@ namespace Robust.Shared.Prototypes
 
             var name = attribute.Type ?? CalculatePrototypeName(kind);
 
+            if (_ignoredPrototypeTypes.Contains(name))
+            {
+                // For whatever reason, we are registering a prototype despite it having been marked as ignored.
+                // This often happens when someone is moving a server or client prototype to shared. Maybe this should
+                // log an error, but I want to avoid breaking changes and maaaaybe there some weird instance where you
+                // want the client to know that a prototype kind exists, without having the client load information
+                // about the individual prototypes? So for now lets just log a warning instead of introducing breaking
+                // changes.
+                Sawmill.Warning($"Registering an ignored prototype {kind}");
+            }
+
             if (_kindNames.TryGetValue(name, out var existing))
             {
                 throw new InvalidImplementationException(kind,
diff --git a/Robust.Shared/Serialization/TypeSerializers/Implementations/Custom/Prototype/PrototypeIdSerializer.cs b/Robust.Shared/Serialization/TypeSerializers/Implementations/Custom/Prototype/PrototypeIdSerializer.cs
index 17ca71d3b..9a075f80f 100644
--- a/Robust.Shared/Serialization/TypeSerializers/Implementations/Custom/Prototype/PrototypeIdSerializer.cs
+++ b/Robust.Shared/Serialization/TypeSerializers/Implementations/Custom/Prototype/PrototypeIdSerializer.cs
@@ -3,6 +3,7 @@ using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization.Manager;
 using Robust.Shared.Serialization.Markdown.Validation;
 using Robust.Shared.Serialization.Markdown.Value;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Generic;
 using Robust.Shared.Serialization.TypeSerializers.Interfaces;
 
 namespace Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype
@@ -30,10 +31,7 @@ namespace Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Pro
         public virtual ValidationNode Validate(ISerializationManager serializationManager, ValueDataNode node,
             IDependencyCollection dependencies, ISerializationContext? context = null)
         {
-            var protoMan = dependencies.Resolve<IPrototypeManager>();
-            return protoMan.TryGetKindFrom<TPrototype>(out _) && protoMan.HasIndex<TPrototype>(node.Value)
-                ? new ValidatedValueNode(node)
-                : new ErrorNode(node, $"PrototypeID {node.Value} for type {typeof(TPrototype)} at {node.Start} not found");
+            return ProtoIdSerializer<TPrototype>.Validate(dependencies, node);
         }
     }
 }
diff --git a/Robust.Shared/Serialization/TypeSerializers/Implementations/Generic/ProtoIdSerializer.cs b/Robust.Shared/Serialization/TypeSerializers/Implementations/Generic/ProtoIdSerializer.cs
index d04537c2a..cf383bb35 100644
--- a/Robust.Shared/Serialization/TypeSerializers/Implementations/Generic/ProtoIdSerializer.cs
+++ b/Robust.Shared/Serialization/TypeSerializers/Implementations/Generic/ProtoIdSerializer.cs
@@ -19,8 +19,19 @@ public sealed class ProtoIdSerializer<T> : ITypeSerializer<ProtoId<T>, ValueData
 {
     public ValidationNode Validate(ISerializationManager serialization, ValueDataNode node, IDependencyCollection dependencies, ISerializationContext? context = null)
     {
-        var prototypes = dependencies.Resolve<IPrototypeManager>();
-        if (prototypes.TryGetKindFrom<T>(out _) && prototypes.HasMapping<T>(node.Value))
+        return Validate(dependencies, node);
+    }
+
+    public static ValidationNode Validate(IDependencyCollection deps, ValueDataNode node)
+    {
+        var proto = deps.Resolve<IPrototypeManager>();
+        if (!proto.TryGetKindFrom<T>(out var kind))
+            return new ErrorNode(node, $"Unknown prototype kind: {typeof(T)}");
+
+        if (proto.IsIgnored(kind))
+            return new ErrorNode(node,$"Attempting to validate an ignored prototype: {typeof(T)}.\nDid you forget to remove the IPrototypeManager.RegisterIgnore(\"{kind}\") call when moving a prototype to Shared?");
+
+        if (proto.HasMapping<T>(node.Value))
             return new ValidatedValueNode(node);
 
         return new ErrorNode(node, $"No {typeof(T)} found with id {node.Value}");