diff --git a/src/Testing/CoreTests/Runtime/Agents/listener_agent_uri_includes_transport_scheme.cs b/src/Testing/CoreTests/Runtime/Agents/listener_agent_uri_includes_transport_scheme.cs
new file mode 100644
index 000000000..4ae10094c
--- /dev/null
+++ b/src/Testing/CoreTests/Runtime/Agents/listener_agent_uri_includes_transport_scheme.cs
@@ -0,0 +1,74 @@
+using Shouldly;
+using Wolverine.Configuration;
+using Wolverine.Runtime;
+using Wolverine.Runtime.Agents;
+using Wolverine.Transports;
+using Wolverine.Transports.Sending;
+using Xunit;
+
+namespace CoreTests.Runtime.Agents;
+
+// GH-3027: a single host listening on the same logical queue name across multiple transports
+// (e.g. a "critterwatch" queue on both Rabbit and SQS) produced colliding leader-pinned /
+// exclusive listener agent Uris — they were composed from only the family scheme + EndpointName,
+// with no transport identifier — so the family's `.ToDictionary(e => e.Uri)` threw
+// "An item with the same key has already been added." Including the endpoint's transport scheme
+// in the agent Uri keeps the keys distinct.
+public class listener_agent_uri_includes_transport_scheme
+{
+    private static Endpoint EndpointFor(string scheme)
+        => new SchemeEndpoint(new Uri($"{scheme}://queue/critterwatch")) { EndpointName = "critterwatch" };
+
+    [Fact]
+    public void leader_pinned_agent_uri_carries_the_transport_scheme()
+    {
+        var rabbit = new LeaderPinnedListenerAgent(EndpointFor("rabbitmq"), null!);
+        var sqs = new LeaderPinnedListenerAgent(EndpointFor("sqs"), null!);
+
+        rabbit.Uri.ShouldBe(new Uri("wolverine-leader-listener://rabbitmq/critterwatch"));
+        sqs.Uri.ShouldBe(new Uri("wolverine-leader-listener://sqs/critterwatch"));
+        rabbit.Uri.ShouldNotBe(sqs.Uri);
+    }
+
+    [Fact]
+    public void exclusive_agent_uri_carries_the_transport_scheme()
+    {
+        var rabbit = new ExclusiveListenerAgent(EndpointFor("rabbitmq"), null!);
+        var sqs = new ExclusiveListenerAgent(EndpointFor("sqs"), null!);
+
+        rabbit.Uri.ShouldBe(new Uri("wolverine-listener://rabbitmq/critterwatch"));
+        sqs.Uri.ShouldBe(new Uri("wolverine-listener://sqs/critterwatch"));
+        rabbit.Uri.ShouldNotBe(sqs.Uri);
+    }
+
+    [Fact]
+    public void same_named_listeners_across_transports_do_not_collide_in_the_family_dictionary()
+    {
+        // Mirrors LeaderPinnedListenerFamily / ExclusiveListenerFamily ctors, which build the agent
+        // set with `.ToDictionary(e => e.Uri)`. Pre-fix this threw on the second same-named endpoint.
+        Endpoint[] endpoints = [EndpointFor("rabbitmq"), EndpointFor("sqs"), EndpointFor("azure-service-bus")];
+
+        Should.NotThrow(() => endpoints
+            .Select(e => new LeaderPinnedListenerAgent(e, null!))
+            .ToDictionary(e => e.Uri));
+
+        Should.NotThrow(() => endpoints
+            .Select(e => new ExclusiveListenerAgent(e, null!))
+            .ToDictionary(e => e.Uri));
+    }
+
+    // Minimal concrete Endpoint whose Uri scheme is controllable — the only thing the listener
+    // agent ctors read besides EndpointName.
+    private sealed class SchemeEndpoint : Endpoint
+    {
+        public SchemeEndpoint(Uri uri) : base(uri, EndpointRole.Application)
+        {
+        }
+
+        public override ValueTask<IListener> BuildListenerAsync(IWolverineRuntime runtime, IReceiver receiver)
+            => throw new NotSupportedException();
+
+        protected override ISender CreateSender(IWolverineRuntime runtime)
+            => throw new NotSupportedException();
+    }
+}
diff --git a/src/Wolverine/Runtime/Agents/ExclusiveListenerFamily.cs b/src/Wolverine/Runtime/Agents/ExclusiveListenerFamily.cs
index 22180377d..537280501 100644
--- a/src/Wolverine/Runtime/Agents/ExclusiveListenerFamily.cs
+++ b/src/Wolverine/Runtime/Agents/ExclusiveListenerFamily.cs
@@ -16,7 +16,10 @@ public ExclusiveListenerAgent(Endpoint endpoint, IWolverineRuntime runtime)
         _endpoint = endpoint;
         _runtime = runtime;
 
-        Uri = new Uri($"{ExclusiveListenerFamily.SchemeName}://{_endpoint.EndpointName}");
+        // Include the endpoint's transport scheme so two endpoints that share the same logical
+        // EndpointName across different transports (e.g. a "critterwatch" queue on both Rabbit and
+        // SQS) don't collapse to the same agent Uri and collide in the family's ToDictionary. GH-3027.
+        Uri = new Uri($"{ExclusiveListenerFamily.SchemeName}://{_endpoint.Uri.Scheme}/{_endpoint.EndpointName}");
     }
 
     public Task StartAsync(CancellationToken cancellationToken)
diff --git a/src/Wolverine/Runtime/Agents/LeaderPinnedAgentFamily.cs b/src/Wolverine/Runtime/Agents/LeaderPinnedAgentFamily.cs
index c2c0bcb49..9cca0a9bf 100644
--- a/src/Wolverine/Runtime/Agents/LeaderPinnedAgentFamily.cs
+++ b/src/Wolverine/Runtime/Agents/LeaderPinnedAgentFamily.cs
@@ -16,7 +16,10 @@ public LeaderPinnedListenerAgent(Endpoint endpoint, IWolverineRuntime runtime)
         _endpoint = endpoint;
         _runtime = runtime;
 
-        Uri = new Uri($"{LeaderPinnedListenerFamily.SchemeName}://{_endpoint.EndpointName}");
+        // Include the endpoint's transport scheme so two endpoints that share the same logical
+        // EndpointName across different transports (e.g. a "critterwatch" queue on both Rabbit and
+        // SQS) don't collapse to the same agent Uri and collide in the family's ToDictionary. GH-3027.
+        Uri = new Uri($"{LeaderPinnedListenerFamily.SchemeName}://{_endpoint.Uri.Scheme}/{_endpoint.EndpointName}");
     }
 
     public Task StartAsync(CancellationToken cancellationToken)