fix: playground captain v2 scenarios (#13747)

# Pull Request Template

## Description

Playground now uses v2. It was only wired to use v1. Traces get `source:
playground` on langfuse when playground has been used.

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce. Please also list any relevant details
for your test configuration.

locally and specs
<img width="1806" height="1276" alt="image"
src="https://github.com/user-attachments/assets/41ef4eb3-52b1-4b8e-9a4f-e8510c90cb39"
/>


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules

enterprise/app/controllers/api/v1/accounts/captain/assistants_controller.rb

@@ -24,10 +24,16 @@ class Api::V1::Accounts::Captain::AssistantsController < Api::V1::Accounts::Base
   end
 
   def playground
-    response = Captain::Llm::AssistantChatService.new(assistant: @assistant).generate_response(
-      additional_message: params[:message_content],
-      message_history: message_history
-    )
+    response = if captain_v2_enabled?
+                 Captain::Assistant::AgentRunnerService.new(assistant: @assistant, source: 'playground').generate_response(
+                   message_history: playground_message_history
+                 )
+               else
+                 Captain::Llm::AssistantChatService.new(assistant: @assistant, source: 'playground').generate_response(
+                   additional_message: playground_params[:message_content],
+                   message_history: message_history
+                 )
+               end
 
     render json: response
   end
@@ -64,10 +70,31 @@ class Api::V1::Accounts::Captain::AssistantsController < Api::V1::Accounts::Base
   end
 
   def playground_params
-    params.require(:assistant).permit(:message_content, message_history: [:role, :content])
+    params.require(:assistant).permit(:message_content, message_history: [:role, :content, :agent_name])
   end
 
   def message_history
-    (playground_params[:message_history] || []).map { |message| { role: message[:role], content: message[:content] } }
+    (playground_params[:message_history] || []).map do |message|
+      {
+        role: message[:role],
+        content: message[:content],
+        agent_name: message[:agent_name]
+      }.compact
+    end
+  end
+
+  def playground_message_history
+    history = message_history
+    current_message = playground_params[:message_content]
+    return history if current_message.blank?
+
+    current_user_message = { role: 'user', content: current_message }
+    return history if history.last == current_user_message
+
+    history + [current_user_message]
+  end
+
+  def captain_v2_enabled?
+    @assistant.account.feature_enabled?('captain_integration_v2')
   end
 end

enterprise/app/helpers/captain/chat_helper.rb

@@ -5,7 +5,6 @@ module Captain::ChatHelper
 
   def request_chat_completion
     log_chat_completion_request
-
     chat = build_chat
 
     add_messages_to_chat(chat)
@@ -86,7 +85,8 @@ module Captain::ChatHelper
       temperature: temperature,
       metadata: {
         assistant_id: @assistant&.id,
-        channel_type: resolved_channel_type
+        channel_type: resolved_channel_type,
+        source: @source
       }.compact
     }
   end
@@ -130,7 +130,6 @@ module Captain::ChatHelper
   end
 
   def log_chat_completion_request
-    Rails.logger.info("#{self.class.name} Assistant: #{@assistant.id}, Requesting chat completion " \
-                      "for messages #{@messages} with #{@tools&.length || 0} tools")
+    Rails.logger.info("#{self.class.name} Assistant: #{@assistant.id}, requesting completion for #{@messages} with #{@tools&.length || 0} tools")
   end
 end

enterprise/app/services/captain/assistant/agent_runner_service.rb

@@ -19,11 +19,11 @@ class Captain::Assistant::AgentRunnerService
   CONTACT_INBOX_STATE_ATTRIBUTES = %i[id hmac_verified].freeze
 
   CAMPAIGN_STATE_ATTRIBUTES = %i[id title message campaign_type description].freeze
-
-  def initialize(assistant:, conversation: nil, callbacks: {})
+  def initialize(assistant:, conversation: nil, callbacks: {}, source: nil)
     @assistant = assistant
     @conversation = conversation
     @callbacks = callbacks
+    @source = source
   end
 
   def generate_response(message_history: [])
@@ -32,8 +32,7 @@ class Captain::Assistant::AgentRunnerService
 
     process_agent_result(result)
   rescue StandardError => e
-    # when running the agent runner service in a rake task, the conversation might not have an account associated
-    # for regular production usage, it will run just fine
+    # In rake/local runs, conversation may not be present, so account is optional here.
     ChatwootExceptionTracker.new(e, account: @conversation&.account).capture_exception
     Rails.logger.error "[Captain V2] AgentRunnerService error: #{e.message}"
     Rails.logger.error e.backtrace.join("\n")
@@ -128,6 +127,7 @@ class Captain::Assistant::AgentRunnerService
       assistant_id: @assistant.id,
       assistant_config: @assistant.config
     }
+    state[:source] = @source if @source.present?
 
     build_conversation_state(state) if @conversation
     state
@@ -140,8 +140,7 @@ class Captain::Assistant::AgentRunnerService
     state[:campaign] = @conversation.campaign.attributes.symbolize_keys.slice(*CAMPAIGN_STATE_ATTRIBUTES) if @conversation.campaign
     return unless @conversation.contact_inbox
 
-    state[:contact_inbox] =
-      @conversation.contact_inbox.attributes.symbolize_keys.slice(*CONTACT_INBOX_STATE_ATTRIBUTES)
+    state[:contact_inbox] = @conversation.contact_inbox.attributes.symbolize_keys.slice(*CONTACT_INBOX_STATE_ATTRIBUTES)
   end
 
   def build_and_wire_agents
@@ -180,6 +179,7 @@ class Captain::Assistant::AgentRunnerService
       format(ATTR_LANGFUSE_METADATA, 'conversation_id') => conversation[:id],
       format(ATTR_LANGFUSE_METADATA, 'conversation_display_id') => conversation[:display_id],
       format(ATTR_LANGFUSE_METADATA, 'channel_type') => state[:channel_type],
+      format(ATTR_LANGFUSE_METADATA, 'source') => state[:source],
       ATTR_LANGFUSE_TRACE_INPUT => trace_input,
       ATTR_LANGFUSE_OBSERVATION_INPUT => trace_input
     }.compact.transform_values(&:to_s)

enterprise/app/services/captain/llm/assistant_chat_service.rb

@@ -1,11 +1,12 @@
 class Captain::Llm::AssistantChatService < Llm::BaseAiService
   include Captain::ChatHelper
 
-  def initialize(assistant: nil, conversation_id: nil)
+  def initialize(assistant: nil, conversation_id: nil, source: nil)
     super()
 
     @assistant = assistant
     @conversation_id = conversation_id
+    @source = source
 
     @messages = [system_message]
     @response = ''