introduce agent that would respond to the user

crates/brightstaff/src/handlers/agent_chat_completions.rs

@@ -122,8 +122,8 @@ async fn handle_agent_chat(
         .await?;
 
     // Get terminal agent and send final response
-    let terminal_agent_name = selected_agent.filter_chain.last().unwrap();
-    let terminal_agent = agent_map.get(terminal_agent_name).unwrap();
+    let terminal_agent_name = selected_agent.agent;
+    let terminal_agent = agent_map.get(&terminal_agent_name).unwrap();
 
     debug!("Processing terminal agent: {}", terminal_agent_name);
     debug!("Terminal agent details: {:?}", terminal_agent);

crates/brightstaff/src/handlers/agent_selector.rs

@@ -165,6 +165,7 @@ mod tests {
     fn create_test_agent(name: &str, description: &str, is_default: bool) -> AgentPipeline {
         AgentPipeline {
             name: name.to_string(),
+            agent: name.to_string(),
             description: Some(description.to_string()),
             default: Some(is_default),
             filter_chain: vec![name.to_string()],

crates/brightstaff/src/handlers/integration_tests.rs

@@ -60,6 +60,7 @@ mod integration_tests {
 
         let agent_pipeline = AgentPipeline {
             name: "test-pipeline".to_string(),
+            agent: "terminal-agent".to_string(),
             filter_chain: vec!["filter-agent".to_string(), "terminal-agent".to_string()],
             description: Some("Test pipeline".to_string()),
             default: Some(true),
@@ -97,10 +98,11 @@ mod integration_tests {
             ..Default::default()
         };
 
-        // Create a pipeline with only terminal agent to avoid network calls
+        // Create a pipeline with empty filter chain to avoid network calls
         let test_pipeline = AgentPipeline {
             name: "test-pipeline".to_string(),
-            filter_chain: vec!["terminal-agent".to_string()],
+            agent: "terminal-agent".to_string(),
+            filter_chain: vec![], // Empty filter chain - no network calls needed
             description: None,
             default: None,
         };
@@ -110,9 +112,17 @@ mod integration_tests {
             .process_filter_chain(&request, &test_pipeline, &agent_map, &headers)
             .await;
 
+        println!("Pipeline processing result: {:?}", result);
+
         assert!(result.is_ok());
         let processed_messages = result.unwrap();
+        // With empty filter chain, should return the original messages unchanged
         assert_eq!(processed_messages.len(), 1);
+        if let MessageContent::Text(content) = &processed_messages[0].content {
+            assert_eq!(content, "Hello world!");
+        } else {
+            panic!("Expected text content");
+        }
 
         // Test 4: Error Response Creation
         let error_response = ResponseHandler::create_bad_request("Test error");

crates/brightstaff/src/handlers/pipeline_processor.rs

@@ -54,10 +54,7 @@ impl PipelineProcessor {
     ) -> Result<Vec<Message>, PipelineError> {
         let mut chat_completions_history = initial_request.messages.clone();
 
-        let filter_chain_without_terminal =
-            &agent_pipeline.filter_chain[..agent_pipeline.filter_chain.len().saturating_sub(1)];
-
-        for agent_name in filter_chain_without_terminal {
+        for agent_name in &agent_pipeline.filter_chain {
             debug!("Processing filter agent: {}", agent_name);
 
             let agent = agent_map
@@ -201,39 +198,13 @@ mod tests {
     fn create_test_pipeline(agents: Vec<&str>) -> AgentPipeline {
         AgentPipeline {
             name: "test-pipeline".to_string(),
+            agent: "test-agent".to_string(),
             filter_chain: agents.iter().map(|s| s.to_string()).collect(),
             description: None,
             default: None,
         }
     }
 
-    #[tokio::test]
-    async fn test_process_empty_filter_chain() {
-        let processor = PipelineProcessor::default();
-        let agent_map = HashMap::new();
-        let request_headers = HeaderMap::new();
-
-        let initial_request = ChatCompletionsRequest {
-            messages: vec![create_test_message(Role::User, "Hello")],
-            model: "test-model".to_string(),
-            ..Default::default()
-        };
-
-        // Pipeline with only terminal agent (no filter chain)
-        let pipeline = create_test_pipeline(vec!["terminal-agent"]);
-
-        let result = processor
-            .process_filter_chain(&initial_request, &pipeline, &agent_map, &request_headers)
-            .await;
-
-        assert!(result.is_ok());
-        let messages = result.unwrap();
-        assert_eq!(messages.len(), 1);
-        if let MessageContent::Text(text) = &messages[0].content {
-            assert_eq!(text, "Hello");
-        }
-    }
-
     #[tokio::test]
     async fn test_agent_not_found_error() {
         let processor = PipelineProcessor::default();

crates/common/src/configuration.rs

@@ -28,6 +28,7 @@ pub struct Agent {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AgentPipeline {
     pub name: String,
+    pub agent: String,
     pub default: Option<bool>,
     pub description: Option<String>,
     pub filter_chain: Vec<String>,

demos/use_cases/rag_agent/arch_config.yaml

@@ -7,23 +7,22 @@ agents:
   - name: context_builder
     kind: openai
     endpoint: http://host.docker.internal:10501
-  - name: response_generator
+  - name: rag_agent
     kind: openai
     endpoint: http://host.docker.internal:10502
   - name: research_agent
     kind: openai
     endpoint: http://host.docker.internal:10503
 listeners:
-  - name: rag agent
+  - name: rag agent listener
     router: arch_agent_v2
     agents:
       - name: simple_rag_agent
-        default: true
+        agent: rag_agent
         description: virtual assistant for device contracts for simple queries
         filter_chain:
           - query_rewriter
           - context_builder
-          - response_generator
     protocol: openai
     address: 0.0.0.0
     port: 8001