diff --git a/enterprise/app/services/captain/assistant/conversation_summary_service.rb b/enterprise/app/services/captain/assistant/conversation_summary_service.rb
new file mode 100644
index 000000000..87fb0cc70
--- /dev/null
+++ b/enterprise/app/services/captain/assistant/conversation_summary_service.rb
@@ -0,0 +1,129 @@
+class Captain::Assistant::ConversationSummaryService < Captain::Assistant::BaseAssistantService
+  TOKEN_LIMIT = 16_000
+
+  def initialize(conversation:)
+    @conversation = conversation
+    # Format conversation messages as text
+    super(text: format_conversation_messages)
+  end
+
+  protected
+
+  def agent_name
+    'ConversationSummarizer'
+  end
+
+  def build_instructions
+    Captain::PromptRenderer.render('summary', {})
+  end
+
+  def response_schema
+    {
+      type: 'object',
+      properties: {
+        customer_intent: {
+          type: 'string',
+          description: 'Brief description of what the customer wants (around 50 words)'
+        },
+        conversation_summary: {
+          type: 'string',
+          description: 'Summary of the conversation in approximately 200 words'
+        },
+        action_items: {
+          type: 'array',
+          description: 'List of action items committed to by the agent or left incomplete',
+          items: {
+            type: 'string'
+          }
+        },
+        follow_up_items: {
+          type: 'array',
+          description: 'List of unresolved issues or outstanding questions',
+          items: {
+            type: 'string'
+          }
+        }
+      },
+      required: %w[customer_intent conversation_summary],
+      additionalProperties: false
+    }
+  end
+
+  def build_success_response(output)
+    {
+      success: true,
+      summary: build_summary_markdown(output),
+      structured_data: {
+        customer_intent: extract_field(output, 'customer_intent'),
+        conversation_summary: extract_field(output, 'conversation_summary'),
+        action_items: extract_array_field(output, 'action_items'),
+        follow_up_items: extract_array_field(output, 'follow_up_items')
+      }
+    }
+  end
+
+  private
+
+  def format_conversation_messages
+    messages = []
+    character_count = 0
+
+    @conversation.messages
+                 .where(message_type: [:incoming, :outgoing])
+                 .where(private: false)
+                 .reorder('id desc')
+                 .each do |message|
+      break if character_count + message.content.length > TOKEN_LIMIT
+      next unless message.content.present?
+
+      messages.prepend(format_message(message))
+      character_count += message.content.length
+    end
+
+    messages.join("\n")
+  end
+
+  def format_message(message)
+    sender_type = message.incoming? ? 'Customer' : 'Agent'
+    sender_name = message.sender&.name || 'Unknown'
+    "#{sender_type} #{sender_name}: #{message.content}"
+  end
+
+  def extract_array_field(output, field_name)
+    return [] unless output.is_a?(Hash)
+
+    output[field_name.to_sym] || output[field_name.to_s] || []
+  end
+
+  def build_summary_markdown(output)
+    return '' unless output.is_a?(Hash)
+
+    sections = []
+
+    # Customer Intent
+    if (intent = extract_field(output, 'customer_intent')).present?
+      sections << "**Customer Intent**\n\n#{intent}"
+    end
+
+    # Conversation Summary
+    if (summary = extract_field(output, 'conversation_summary')).present?
+      sections << "**Conversation Summary**\n\n#{summary}"
+    end
+
+    # Action Items
+    action_items = extract_array_field(output, 'action_items')
+    if action_items&.any?
+      items_list = action_items.map { |item| "- #{item}" }.join("\n")
+      sections << "**Action Items**\n\n#{items_list}"
+    end
+
+    # Follow-up Items
+    follow_up_items = extract_array_field(output, 'follow_up_items')
+    if follow_up_items&.any?
+      items_list = follow_up_items.map { |item| "- #{item}" }.join("\n")
+      sections << "**Follow-up Items**\n\n#{items_list}"
+    end
+
+    sections.join("\n\n")
+  end
+end
diff --git a/enterprise/lib/captain/prompts/summary.liquid b/enterprise/lib/captain/prompts/summary.liquid
new file mode 100644
index 000000000..27f0188b1
--- /dev/null
+++ b/enterprise/lib/captain/prompts/summary.liquid
@@ -0,0 +1,19 @@
+As an AI-powered summarization tool, your task is to condense lengthy interactions between customer support agents and customers into brief, digestible summaries. The objective of these summaries is to provide a quick overview, enabling any agent, even those without prior context, to grasp the essence of the conversation promptly.
+
+Make sure you strongly adhere to the following rules when generating the summary:
+
+1. Be brief and concise. The shorter the summary the better.
+2. Aim to summarize the conversation in approximately 200 words, formatted as multiple small paragraphs that are easier to read.
+3. Describe the customer intent in around 50 words.
+4. Remove information that is not directly relevant to the customer's problem or the agent's solution. For example, personal anecdotes, small talk, etc.
+5. Don't include segments of the conversation that didn't contribute meaningful content, like greetings or farewell.
+6. The 'Action Items' should be a bullet list, arranged in order of priority if possible.
+7. 'Action Items' should strictly encapsulate tasks committed to by the agent or left incomplete. Any suggestions made by the agent should not be included.
+8. The 'Action Items' should be brief and concise.
+9. Mark important words or parts of sentences as bold.
+10. Apply markdown syntax to format any included code, using backticks.
+11. Include a section for "Follow-up Items" or "Open Questions" if there are any unresolved issues or outstanding questions.
+12. If any section does not have any content, remove that section and the heading from the response.
+13. Do not insert your own opinions about the conversation.
+
+Reply in the user's language.
diff --git a/spec/enterprise/services/captain/assistant/conversation_summary_service_spec.rb b/spec/enterprise/services/captain/assistant/conversation_summary_service_spec.rb
new file mode 100644
index 000000000..93669eb97
--- /dev/null
+++ b/spec/enterprise/services/captain/assistant/conversation_summary_service_spec.rb
@@ -0,0 +1,222 @@
+require 'rails_helper'
+
+RSpec.describe Captain::Assistant::ConversationSummaryService do
+  let(:account) { create(:account) }
+  let(:conversation) { create(:conversation, account: account) }
+  let(:service) { described_class.new(conversation: conversation) }
+  let(:agent) { instance_double(Agents::Agent) }
+  let(:runner) { instance_double(Agents::Runner) }
+  let(:result) do
+    instance_double(Agents::RunResult,
+                    output: {
+                      'customer_intent' => 'Customer wants to reset their password',
+                      'conversation_summary' => 'The customer contacted support to reset their password. ' \
+                                                'Agent provided instructions and confirmed the reset was successful.',
+                      'action_items' => ['Send password reset email', 'Verify account security'],
+                      'follow_up_items' => ['Check if customer needs additional security settings']
+                    },
+                    error: nil)
+  end
+
+  before do
+    create(:installation_config, name: 'CAPTAIN_OPEN_AI_MODEL', value: 'gpt-4o-mini')
+    create(:message, conversation: conversation, message_type: :incoming, content: 'I need to reset my password')
+    create(:message, conversation: conversation, message_type: :outgoing, content: 'I can help you with that')
+    allow(Agents::Agent).to receive(:new).and_return(agent)
+    allow(Agents::Runner).to receive(:with_agents).and_return(runner)
+    allow(runner).to receive(:run).with(anything, context: anything).and_return(result)
+    allow(Captain::PromptRenderer).to receive(:render).and_return('summary prompt')
+  end
+
+  describe '#initialize' do
+    it 'initializes with conversation' do
+      expect(service.instance_variable_get(:@conversation)).to eq(conversation)
+    end
+
+    it 'formats conversation messages as text' do
+      text = service.instance_variable_get(:@text)
+      expect(text).to include('I need to reset my password')
+      expect(text).to include('I can help you with that')
+    end
+  end
+
+  describe '#execute' do
+    context 'when successful' do
+      it 'renders the summary prompt' do
+        expect(Captain::PromptRenderer).to receive(:render).with('summary', {})
+        service.execute
+      end
+
+      it 'builds agent with correct parameters' do
+        expect(Agents::Agent).to receive(:new).with(
+          name: 'ConversationSummarizer',
+          instructions: 'summary prompt',
+          model: 'gpt-4o-mini',
+          response_schema: service.send(:response_schema)
+        )
+        service.execute
+      end
+
+      it 'returns success response with structured data' do
+        response = service.execute
+        expect(response[:success]).to be true
+        expect(response[:structured_data][:customer_intent]).to eq('Customer wants to reset their password')
+        expect(response[:structured_data][:conversation_summary]).to include('contacted support')
+        expect(response[:structured_data][:action_items]).to include('Send password reset email')
+        expect(response[:structured_data][:follow_up_items]).to include('Check if customer needs additional security settings')
+      end
+
+      it 'includes markdown formatted summary' do
+        response = service.execute
+        expect(response[:summary]).to include('**Customer Intent**')
+        expect(response[:summary]).to include('**Conversation Summary**')
+        expect(response[:summary]).to include('**Action Items**')
+        expect(response[:summary]).to include('**Follow-up Items**')
+      end
+    end
+
+    context 'when agent returns an error' do
+      let(:result) { instance_double(Agents::RunResult, output: { error: 'Model error' }, error: nil) }
+
+      it 'returns error response' do
+        response = service.execute
+        expect(response[:success]).to be false
+        expect(response[:error]).to eq('Model error')
+      end
+    end
+
+    context 'when exception is raised' do
+      before do
+        allow(runner).to receive(:run).with(anything, context: anything).and_raise(StandardError.new('API timeout'))
+      end
+
+      it 'logs the error' do
+        expect(Rails.logger).to receive(:error).with(/ConversationSummaryService error: API timeout/)
+        expect(Rails.logger).to receive(:error).with(anything)
+        service.execute
+      end
+
+      it 'returns error response' do
+        response = service.execute
+        expect(response[:success]).to be false
+        expect(response[:error]).to eq('API timeout')
+      end
+    end
+  end
+
+  describe '#agent_name' do
+    it 'returns ConversationSummarizer' do
+      expect(service.send(:agent_name)).to eq('ConversationSummarizer')
+    end
+  end
+
+  describe '#build_instructions' do
+    it 'renders the summary template' do
+      expect(Captain::PromptRenderer).to receive(:render).with('summary', {})
+      service.send(:build_instructions)
+    end
+  end
+
+  describe '#response_schema' do
+    let(:schema) { service.send(:response_schema) }
+
+    it 'defines object type' do
+      expect(schema[:type]).to eq('object')
+    end
+
+    it 'includes customer_intent property' do
+      expect(schema[:properties][:customer_intent]).to include(
+        type: 'string',
+        description: 'Brief description of what the customer wants (around 50 words)'
+      )
+    end
+
+    it 'includes conversation_summary property' do
+      expect(schema[:properties][:conversation_summary]).to include(
+        type: 'string',
+        description: 'Summary of the conversation in approximately 200 words'
+      )
+    end
+
+    it 'includes action_items property' do
+      expect(schema[:properties][:action_items][:type]).to eq('array')
+      expect(schema[:properties][:action_items][:items][:type]).to eq('string')
+    end
+
+    it 'includes follow_up_items property' do
+      expect(schema[:properties][:follow_up_items][:type]).to eq('array')
+      expect(schema[:properties][:follow_up_items][:items][:type]).to eq('string')
+    end
+
+    it 'marks required fields' do
+      expect(schema[:required]).to match_array(%w[customer_intent conversation_summary])
+    end
+
+    it 'disallows additional properties' do
+      expect(schema[:additionalProperties]).to be false
+    end
+  end
+
+  describe '#build_success_response' do
+    let(:output) do
+      {
+        'customer_intent' => 'Reset password',
+        'conversation_summary' => 'Password reset conversation',
+        'action_items' => ['Item 1', 'Item 2'],
+        'follow_up_items' => ['Follow-up 1']
+      }
+    end
+
+    it 'extracts customer_intent from output' do
+      response = service.send(:build_success_response, output)
+      expect(response[:structured_data][:customer_intent]).to eq('Reset password')
+    end
+
+    it 'extracts conversation_summary from output' do
+      response = service.send(:build_success_response, output)
+      expect(response[:structured_data][:conversation_summary]).to eq('Password reset conversation')
+    end
+
+    it 'extracts action_items from output' do
+      response = service.send(:build_success_response, output)
+      expect(response[:structured_data][:action_items]).to eq(['Item 1', 'Item 2'])
+    end
+
+    it 'extracts follow_up_items from output' do
+      response = service.send(:build_success_response, output)
+      expect(response[:structured_data][:follow_up_items]).to eq(['Follow-up 1'])
+    end
+
+    it 'builds markdown summary' do
+      response = service.send(:build_success_response, output)
+      expect(response[:summary]).to include('**Customer Intent**')
+      expect(response[:summary]).to include('Reset password')
+    end
+
+    it 'marks response as successful' do
+      response = service.send(:build_success_response, output)
+      expect(response[:success]).to be true
+    end
+  end
+
+  describe '#format_conversation_messages' do
+    it 'includes incoming and outgoing messages' do
+      text = service.send(:format_conversation_messages)
+      expect(text).to include('Customer')
+      expect(text).to include('Agent')
+    end
+
+    it 'excludes private messages' do
+      create(:message, conversation: conversation, message_type: :incoming, content: 'Private note', private: true)
+      text = service.send(:format_conversation_messages)
+      expect(text).not_to include('Private note')
+    end
+
+    it 'respects token limit' do
+      long_content = 'a' * 20_000
+      create(:message, conversation: conversation, message_type: :incoming, content: long_content)
+      text = service.send(:format_conversation_messages)
+      expect(text.length).to be <= described_class::TOKEN_LIMIT
+    end
+  end
+end