diff --git a/slices/admin/actions/auto_tagging/create.rb b/slices/admin/actions/auto_tagging/create.rb
index dc1f732..ac0c4c1 100644
--- a/slices/admin/actions/auto_tagging/create.rb
+++ b/slices/admin/actions/auto_tagging/create.rb
@@ -5,22 +5,32 @@ module Admin
 
         include Deps["commands.auto_tagging.create",
                      "views.auto_tagging.index",
-                     auto_tag: "commands.auto_tagging.tag"]
+                     "validation.contracts.auto_tagging_contract",
+                     auto_tag: "commands.auto_tagging.tag",
+                     new_view: "views.auto_tagging.new"]
 
         def handle(req, res)
           title_contains = req.params[:title_contains]
           body_contains = req.params[:body_contains]
           tag_id = req.params[:tag_id]
 
-          result = create.(title_contains: title_contains,
-                  body_contains: body_contains,
-                  tag_id: tag_id)
+          validation = auto_tagging_contract.call(title_contains: title_contains,
+                                     body_contains: body_contains,
+                                     tag_id: tag_id)
 
-          if result.success?
-            auto_tag.(auto_tag_id: result.value!)
+          if validation.success?
+            result = create.(title_contains: title_contains,
+                    body_contains: body_contains,
+                    tag_id: tag_id)
+
+            if result.success?
+              auto_tag.(auto_tag_id: result.value!)
+            end
+
+            res.render index
           end
 
-          res.render index
+          res.render new_view, errors: validation.errors
         end
       end
     end
diff --git a/slices/admin/actions/auto_tagging/new.rb b/slices/admin/actions/auto_tagging/new.rb
index 940ec3f..dabf94d 100644
--- a/slices/admin/actions/auto_tagging/new.rb
+++ b/slices/admin/actions/auto_tagging/new.rb
@@ -6,7 +6,7 @@ module Admin
         include Deps[new_view: "views.auto_tagging.new"]
 
         def handle(req, res)
-          res.render new_view
+          res.render new_view, errors: {}
         end
       end
     end
diff --git a/slices/admin/templates/auto_tagging/index.html.slim b/slices/admin/templates/auto_tagging/index.html.slim
index 09ceb54..0e3c5a2 100644
--- a/slices/admin/templates/auto_tagging/index.html.slim
+++ b/slices/admin/templates/auto_tagging/index.html.slim
@@ -1,10 +1,11 @@
 div class="mb-12 prose dark:prose-invert max-w-prose mx-auto text-gray-800 dark:text-gray-200"
   h1 Admin // Auto tagging
 
-div class="prose dark:prose-invert max-w-prose mx-auto"
+div class="prose dark:prose-invert max-w-prose mx-auto mb-12"
   - auto_taggings.each do |auto_tagging|
-    div id="auto-tag-#{auto_tagging.id}"
+    div id="auto-tag-#{auto_tagging.id}" class="mb-2"
       == "Tag post with <strong>#{auto_tagging.tag.label}</strong> when <strong>#{auto_tagging.title_only? ? "title" : "content"}</strong> contains <strong>#{auto_tagging.term}</strong>"
       = " — "
       button hx-delete="/admin/tags/auto_taggings/#{auto_tagging.id}" hx-target="#auto-tag-#{auto_tagging.id}" delete
+  a class="bg-blue-100 text-blue-600 p-1 rounded no-underline" href="/admin/tags/auto_tagging/new" New
 div class="max-w-screen-md mx-auto border-t-4 border-solid border-gray-400 dark:border-gray-600"
diff --git a/slices/admin/templates/auto_tagging/new.html.slim b/slices/admin/templates/auto_tagging/new.html.slim
index 4ef2926..38487e5 100644
--- a/slices/admin/templates/auto_tagging/new.html.slim
+++ b/slices/admin/templates/auto_tagging/new.html.slim
@@ -2,6 +2,12 @@ div class="mb-12 prose dark:prose-invert max-w-prose mx-auto text-gray-800 dark:
   h1 Admin // Auto tagging
 
 div class="max-w-prose mx-auto"
+  - if errors
+    div class="text-gray-100 dark:text-gray-100 bg-pink-100 dark:bg-pink-600 rounded px-4 py-2 mb-12"
+      p Errors:
+      - errors.each do |error|
+        li = "#{error[1].join(",")}"
+
   form method="POST" action="/admin/tags/auto_tagging"
     div class="mb-4"
       label class="text-gray-800 dark:text-gray-200" for="title_contains" Title contains:&nbsp;
diff --git a/slices/admin/templates/index.html.slim b/slices/admin/templates/index.html.slim
index bf7dc02..a43abad 100644
--- a/slices/admin/templates/index.html.slim
+++ b/slices/admin/templates/index.html.slim
@@ -1,10 +1,12 @@
 div class="mb-12 prose dark:prose-invert max-w-prose mx-auto text-gray-800 dark:text-gray-200"
   h1 Admin
 
-div class="max-w-prose mx-auto"
+div class="max-w-prose mx-auto prose dark:prose-invert"
   ul
     li
       a href="/admin/tags" Tags
+    li
+      a href="/admin/tags/auto_tagging" Auto tagging
 
 div class="max-w-screen-md mx-auto border-t-4 border-solid border-gray-400 dark:border-gray-600"
 
diff --git a/slices/admin/validation/contracts/auto_tagging_contract.rb b/slices/admin/validation/contracts/auto_tagging_contract.rb
new file mode 100644
index 0000000..f9e36fd
--- /dev/null
+++ b/slices/admin/validation/contracts/auto_tagging_contract.rb
@@ -0,0 +1,18 @@
+module Admin
+  module Validation
+    module Contracts
+      class AutoTaggingContract < Dry::Validation::Contract
+        params do
+          required(:title_contains).maybe(:string)
+          required(:body_contains).maybe(:string)
+          required(:tag_id).filled(:integer)
+        end
+
+        rule(:title_contains, :body_contains) do
+          key.failure("must provide a title or body term") if values[:title_contains].nil? && values[:body_contains].nil?
+          key.failure("must provide a title or body term") if !values[:title_contains].nil? && !values[:body_contains].nil?
+        end
+      end
+    end
+  end
+end
diff --git a/slices/admin/views/auto_tagging/new.rb b/slices/admin/views/auto_tagging/new.rb
index 920e474..757579d 100644
--- a/slices/admin/views/auto_tagging/new.rb
+++ b/slices/admin/views/auto_tagging/new.rb
@@ -8,6 +8,10 @@ module Admin
         expose :tags do
           tag_repo.list.to_a
         end
+
+        expose :errors do |errors:|
+          errors.empty? ? nil : errors.to_h
+        end
       end
     end
   end