fix(agent-bot): dispatch webhook event on agent bot assignment

When an AgentBot is assigned to a conversation after the first message,
the bot receives no event and cannot respond. This adds ASSIGNEE_CHANGED
event dispatch for agent bot assignment changes and handles it in the
AgentBotListener to notify the bot via webhook.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/listeners/agent_bot_listener.rb

@@ -15,6 +15,15 @@ class AgentBotListener < BaseListener
     agent_bots_for(inbox, conversation).each { |agent_bot| process_webhook_bot_event(agent_bot, payload) }
   end
 
+  def assignee_changed(event)
+    conversation = extract_conversation_and_account(event)[0]
+    return unless conversation.assignee_agent_bot.present?
+
+    conversation.inbox
+    payload = conversation.webhook_data.merge(event: __method__.to_s)
+    process_webhook_bot_event(conversation.assignee_agent_bot, payload)
+  end
+
   def message_created(event)
     message = extract_message_and_account(event)[0]
     inbox = message.inbox

app/models/concerns/assignment_handler.rb

@@ -29,7 +29,7 @@ module AssignmentHandler
 
   def notify_assignment_change
     {
-      ASSIGNEE_CHANGED => -> { saved_change_to_assignee_id? },
+      ASSIGNEE_CHANGED => -> { saved_change_to_assignee_id? || saved_change_to_assignee_agent_bot_id? },
       TEAM_CHANGED => -> { saved_change_to_team_id? }
     }.each do |event, condition|
       condition.call && dispatcher_dispatch(event, previous_changes)

spec/listeners/agent_bot_listener_spec.rb

@@ -57,6 +57,30 @@ describe AgentBotListener do
     end
   end
 
+  describe '#assignee_changed' do
+    let(:event_name) { 'assignee.changed' }
+    let!(:event) { Events::Base.new(event_name, Time.zone.now, conversation: conversation) }
+
+    context 'when conversation is assigned to an agent bot' do
+      before do
+        conversation.update!(assignee_agent_bot: agent_bot, assignee: nil)
+      end
+
+      it 'sends webhook to the assigned agent bot' do
+        expect(AgentBots::WebhookJob).to receive(:perform_later).with(agent_bot.outgoing_url,
+                                                                      conversation.webhook_data.merge(event: 'assignee_changed')).once
+        listener.assignee_changed(event)
+      end
+    end
+
+    context 'when conversation is not assigned to an agent bot' do
+      it 'does not send webhook' do
+        expect(AgentBots::WebhookJob).not_to receive(:perform_later)
+        listener.assignee_changed(event)
+      end
+    end
+  end
+
   describe '#webwidget_triggered' do
     let(:event_name) { 'webwidget.triggered' }