diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 054e8bc..466df71 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.2.7"
+  ".": "0.1.0"
 }
diff --git a/Readme.adoc b/Readme.adoc
index 799902a..eb360e4 100644
--- a/Readme.adoc
+++ b/Readme.adoc
@@ -11,12 +11,14 @@ minimal DSL for defining endpoints and middleware.
 
 == Features
 
-* Declarative endpoint definitions with `endpoint`.
-* Middleware support using `use`.
-* Simple concurrency via `run` with a configurable number of instances.
+* Declarative endpoint definitions with `#endpoint`.
+* Grouping of endpoints with `#group`
+* Simple concurrency via `#run` with a configurable number of instances.
 * JSON aware message wrapper that gracefully handles parse errors.
+* Middleware support using `#use`.
 * Railway Oriented Design, using {dry-monads} for success and failure handling.
 * {dry-configurable} settings container.
+* `#logger` defaults to SemanticLogger (adjustable as the `#logger=` setting)
 
 == Requirements
 
diff --git a/lib/leopard/errors.rb b/lib/leopard/errors.rb
index f7054a2..a66b24c 100644
--- a/lib/leopard/errors.rb
+++ b/lib/leopard/errors.rb
@@ -4,5 +4,6 @@ module Rubyists
   module Leopard
     class Error < StandardError; end
     class ConfigurationError < Error; end
+    class ResultError < Error; end
   end
 end
diff --git a/lib/leopard/nats_api_server.rb b/lib/leopard/nats_api_server.rb
index b8bd560..f2d12cc 100644
--- a/lib/leopard/nats_api_server.rb
+++ b/lib/leopard/nats_api_server.rb
@@ -202,10 +202,12 @@ def handle_message(raw_msg, handler)
 
         # Processes the result of the handler execution.
         #
+        #
         # @param wrapper [MessageWrapper] The message wrapper containing the raw message.
         # @param result [Dry::Monads::Result] The result of the handler execution.
         #
         # @return [void]
+        # @raise [ResultError] If the result is not a Success or Failure monad.
         def process_result(wrapper, result)
           case result
           in Dry::Monads::Success
@@ -213,6 +215,9 @@ def process_result(wrapper, result)
           in Dry::Monads::Failure
             logger.error 'Error processing message: ', result.failure
             wrapper.respond_with_error(result.failure)
+          else
+            logger.error('Unexpected result: ', result:)
+            raise ResultError, "Unexpected Response from Handler, must respond with a Success or Failure monad: #{result}"
           end
         end
       end