fix: captain liquid render file system (#13647)

enterprise/lib/captain/prompt_renderer.rb

@@ -5,7 +5,7 @@ class Captain::PromptRenderer
     def render(template_name, context = {})
       template = load_template(template_name)
       liquid_template = Liquid::Template.parse(template)
-      liquid_template.render(stringify_keys(context))
+      liquid_template.render(stringify_keys(context), registers: { file_system: snippet_file_system })
     end
 
     private
@@ -18,6 +18,13 @@ class Captain::PromptRenderer
       File.read(template_path)
     end
 
+    def snippet_file_system
+      @snippet_file_system ||= Liquid::LocalFileSystem.new(
+        Rails.root.join('enterprise/lib/captain/prompts/snippets'),
+        '%s.liquid'
+      )
+    end
+
     def stringify_keys(hash)
       hash.deep_stringify_keys
     end

enterprise/lib/captain/prompts/assistant.liquid

@@ -14,11 +14,11 @@ Don't digress away from your instructions, and use all the available tools at yo
 Here's the metadata we have about the current conversation and the contact associated with it:
 
 {% if conversation -%}
-{% render 'conversation' %}
+{% render 'conversation', conversation: conversation %}
 {% endif -%}
 
 {% if contact -%}
-{% render 'contact' %}
+{% render 'contact', contact: contact %}
 {% endif -%}
 
 {% if campaign.id -%}

enterprise/lib/captain/prompts/scenario.liquid

@@ -14,11 +14,11 @@ If you believe the user's request is not within the scope of your role, you can
 Here's the metadata we have about the current conversation and the contact associated with it:
 
 {% if conversation -%}
-{% render 'conversation' %}
+{% render 'conversation', conversation: conversation %}
 {% endif -%}
 
 {% if contact -%}
-{% render 'contact' %}
+{% render 'contact', contact: contact %}
 {% endif -%}
 
 {% if campaign.id -%}

spec/enterprise/lib/captain/prompt_renderer_spec.rb

@@ -58,7 +58,7 @@ RSpec.describe Captain::PromptRenderer do
     it 'loads and parses liquid template' do
       liquid_template_double = instance_double(Liquid::Template)
       allow(Liquid::Template).to receive(:parse).with(template_content).and_return(liquid_template_double)
-      allow(liquid_template_double).to receive(:render).with(hash_including('name', 'balance')).and_return('rendered')
+      allow(liquid_template_double).to receive(:render).with(hash_including('name', 'balance'), anything).and_return('rendered')
 
       result = described_class.render(template_name, context)
 
@@ -67,6 +67,36 @@ RSpec.describe Captain::PromptRenderer do
     end
   end
 
+  describe 'snippet rendering' do
+    let(:snippets_dir) { Rails.root.join('enterprise/lib/captain/prompts/snippets') }
+    let(:snippet_path) { snippets_dir.join('greeting.liquid') }
+
+    before do
+      allow(File).to receive(:exist?).and_call_original
+      allow(File).to receive(:read).and_call_original
+      allow(File).to receive(:exist?).with(template_path).and_return(true)
+      # Create a controlled snippet to decouple from real snippet content
+      allow(File).to receive(:exist?).with(snippet_path.to_s).and_return(true)
+      allow(File).to receive(:read).with(snippet_path.to_s).and_return('Hello {{ name }}')
+    end
+
+    it 'resolves render tags from the snippets directory' do
+      allow(File).to receive(:read).with(template_path).and_return("{% render 'greeting', name: name %}")
+
+      result = described_class.render(template_name, { name: 'World' })
+
+      expect(result).to eq('Hello World')
+    end
+
+    it 'outputs a liquid error for missing snippets' do
+      allow(File).to receive(:read).with(template_path).and_return("{% render 'nonexistent' %}")
+
+      result = described_class.render(template_name, {})
+
+      expect(result).to include('Liquid error')
+    end
+  end
+
   describe '.load_template' do
     it 'reads template file from correct path' do
       described_class.send(:load_template, template_name)