diff --git a/plugins/commands/serve/client/guest.rb b/plugins/commands/serve/client/guest.rb
index b2a7f71dc..0a88313cb 100644
--- a/plugins/commands/serve/client/guest.rb
+++ b/plugins/commands/serve/client/guest.rb
@@ -8,6 +8,7 @@ module VagrantPlugins
         prepend Util::HasLogger
 
         include CapabilityPlatform
+        include Util::HasSeeds::Client
 
         # @return [<String>] parents
         def parents
diff --git a/plugins/commands/serve/client/host.rb b/plugins/commands/serve/client/host.rb
index 822dc7ac1..81545968e 100644
--- a/plugins/commands/serve/client/host.rb
+++ b/plugins/commands/serve/client/host.rb
@@ -8,6 +8,7 @@ module VagrantPlugins
         prepend Util::HasLogger
 
         include CapabilityPlatform
+        include Util::HasSeeds::Client
 
         # @return [<String>] parents
         def parents
diff --git a/plugins/commands/serve/service/capability_platform_service.rb b/plugins/commands/serve/service/capability_platform_service.rb
index 801b3187b..fcee1eb2f 100644
--- a/plugins/commands/serve/service/capability_platform_service.rb
+++ b/plugins/commands/serve/service/capability_platform_service.rb
@@ -7,6 +7,7 @@ module VagrantPlugins
 
         def self.included(klass)
           klass.include(Util::ServiceInfo)
+          klass.include(Util::HasSeeds::Service)
           klass.prepend(Util::HasMapper)
           klass.prepend(Util::HasBroker)
           klass.prepend(Util::HasLogger)
@@ -22,16 +23,6 @@ module VagrantPlugins
           @default_args = default_args
         end
 
-        # TODO(spox): request scoping for seed values - needs investigation
-        def seed(req, ctx)
-          @seeds = req.arguments.to_a
-          Empty.new
-        end
-
-        def seeds(req, ctx)
-          SDK::Args::Direct.new(arguments: @seeds)
-        end
-
         def has_capability_spec(*_)
           SDK::FuncSpec.new(
             name: "has_capability_spec",
@@ -54,7 +45,7 @@ module VagrantPlugins
           with_info(ctx) do |info|
             cap_name = mapper.funcspec_map(req)
             plugin_name = info.plugin_name
-            logger.debug("checking for #{cap_name} capability in #{plugin_name}")
+            logger.debug("checking for #{cap_name.inspect} capability in #{plugin_name}")
 
             caps_registry = @capabilities[plugin_name.to_sym]
             has_cap = caps_registry.key?(cap_name.to_sym)
@@ -93,6 +84,10 @@ module VagrantPlugins
             caps_registry = capabilities[plugin_name]
             target_cap = caps_registry.get(cap_name)
 
+            if target_cap.nil?
+              raise "Failed to locate requested capability `#{cap_name.inspect}' on plugin #{plugin_name}"
+            end
+
             args = mapper.funcspec_map(
               req.func_args,
               expect: default_args.keys + [Types::Direct]
diff --git a/plugins/commands/serve/service/command_service.rb b/plugins/commands/serve/service/command_service.rb
index eb93b9e0d..777e90d56 100644
--- a/plugins/commands/serve/service/command_service.rb
+++ b/plugins/commands/serve/service/command_service.rb
@@ -5,6 +5,7 @@ module VagrantPlugins
     module Service
       class CommandService < SDK::CommandService::Service
         include Util::ServiceInfo
+        include Util::HasSeeds::Service
 
         prepend Util::HasMapper
         prepend Util::HasBroker
diff --git a/plugins/commands/serve/service/provider_service.rb b/plugins/commands/serve/service/provider_service.rb
index 59c34eb93..405d864c0 100644
--- a/plugins/commands/serve/service/provider_service.rb
+++ b/plugins/commands/serve/service/provider_service.rb
@@ -7,6 +7,7 @@ module VagrantPlugins
     module Service
       class ProviderService < SDK::ProviderService::Service
         include Util::ServiceInfo
+        include Util::HasSeeds::Service
 
         prepend Util::HasMapper
         prepend Util::HasBroker