diff --git a/enterprise/app/jobs/captain/hermes/outgoing_job.rb b/enterprise/app/jobs/captain/hermes/outgoing_job.rb
index 6ec229e41..983e9d3d4 100644
--- a/enterprise/app/jobs/captain/hermes/outgoing_job.rb
+++ b/enterprise/app/jobs/captain/hermes/outgoing_job.rb
@@ -27,6 +27,10 @@ class Captain::Hermes::OutgoingJob < ApplicationJob
       return
     end
 
+    # Auto-react ANTES do dispatch — gesto chega <1s sem esperar Codex.
+    # Não bloqueia fluxo: se falhar, dispatch normal continua.
+    Captain::Hermes::AutoReactService.maybe_react!(message)
+
     Captain::Hermes::Client.new(conversation.inbox).dispatch(message: message, conversation: conversation)
   end
 end
diff --git a/enterprise/app/services/captain/hermes/auto_react_service.rb b/enterprise/app/services/captain/hermes/auto_react_service.rb
new file mode 100644
index 000000000..54f90045a
--- /dev/null
+++ b/enterprise/app/services/captain/hermes/auto_react_service.rb
@@ -0,0 +1,97 @@
+# Auto-react determinístico — dispara reaction antes do LLM processar.
+#
+# Por que existe: quando cliente manda "obrigado", "ok", foto, etc, ele
+# espera o feedback IMEDIATO (gesto). Esperar 10-30s do LLM gerar
+# resposta + decidir chamar tool é UX ruim. Captain detecta padrões
+# comuns e reage <1s, em paralelo ao processamento normal.
+#
+# A resposta de texto continua vindo do Hermes normalmente — auto-react
+# é COMPLEMENTAR, não substitui.
+#
+# Padrões:
+#   - Agradecimento curto → 🙏
+#   - Confirmação ("ok", "fechado", "perfeito", "blz") → 👍
+#   - Imagem (sem texto explicativo) → 😍
+#   - Áudio sem ser "diferente" (não é dúvida complexa) → 🙏
+#
+# Conservative: só dispara em casos CLAROS. Em dúvida, deixa pro LLM
+# decidir via react_to_message tool.
+class Captain::Hermes::AutoReactService
+  THANKS_REGEX = /\A(obrigad[oa]|valeu|vlw|thanks|brigad[oa]|grat[oa])[\s.!,]*\z/i
+  CONFIRMATION_REGEX = /\A(ok|okay|fechado|perfeit[oa]|blz|beleza|combinado|certo|ótim[oa]|legal|pode\s*ser|isso\s*mesmo)[\s.!,]*\z/i
+
+  def self.maybe_react!(message)
+    new(message).maybe_react!
+  end
+
+  def initialize(message)
+    @message = message
+    @conversation = message.conversation
+  end
+
+  def maybe_react!
+    return unless eligible?
+
+    emoji = decide_emoji
+    return if emoji.blank?
+
+    create_reaction!(emoji)
+    Rails.logger.info("[Captain::Hermes::AutoReact] msg ##{@message.id} reagiu com #{emoji}")
+  rescue StandardError => e
+    Rails.logger.warn("[Captain::Hermes::AutoReact] failed for msg ##{@message&.id}: #{e.class} - #{e.message}")
+  end
+
+  private
+
+  def eligible?
+    return false if @message.blank? || @conversation.blank?
+    return false unless @message.message_type == 'incoming'
+    return false if @message.source_id.blank?
+
+    true
+  end
+
+  def decide_emoji
+    text = @message.content.to_s.strip
+
+    return image_emoji if image_attachment?
+    return audio_emoji if audio_attachment? && text.length < 10
+    return '🙏' if THANKS_REGEX.match?(text)
+    return '👍' if CONFIRMATION_REGEX.match?(text)
+
+    nil
+  end
+
+  def image_attachment?
+    @message.attachments.exists?(file_type: :image)
+  end
+
+  def audio_attachment?
+    @message.attachments.exists?(file_type: :audio)
+  end
+
+  def image_emoji
+    '😍'
+  end
+
+  def audio_emoji
+    '🙏'
+  end
+
+  def create_reaction!(emoji)
+    assistant = @conversation.inbox.captain_assistant
+    @conversation.messages.create!(
+      message_type: :outgoing,
+      account_id: @conversation.account_id,
+      inbox_id: @conversation.inbox_id,
+      sender: assistant,
+      content: emoji,
+      content_attributes: {
+        is_reaction: true,
+        in_reply_to_external_id: @message.source_id,
+        in_reply_to: @message.id,
+        external_source: 'hermes_auto_react'
+      }
+    )
+  end
+end