feat: show model in new session reply

pkg/agent/loop.go

@@ -462,7 +462,41 @@ func (al *AgentLoop) startNewSessionForMessage(msg bus.InboundMessage) (string,
 	overrideKey := buildSessionOverrideKey(msg.Channel, msg.ChatID, agent.ID)
 	al.sessionOverride.Set(overrideKey, newSessionKey)
 
-	return "Starting a new conversation...", nil
+	return formatNewSessionResponse(al.cfg, agent), nil
+}
+
+func formatNewSessionResponse(cfg *config.Config, agent *AgentInstance) string {
+	provider, model := resolveAgentModelDisplay(cfg, agent)
+	if model == "" {
+		return "Starting a new conversation..."
+	}
+	if provider == "" {
+		return fmt.Sprintf("Starting a new conversation... (model: %s)", model)
+	}
+	return fmt.Sprintf("Starting a new conversation... (provider: %s, model: %s)", provider, model)
+}
+
+func resolveAgentModelDisplay(cfg *config.Config, agent *AgentInstance) (string, string) {
+	if agent == nil {
+		return "", ""
+	}
+	modelName := strings.TrimSpace(agent.Model)
+	if modelName == "" {
+		return "", ""
+	}
+	if cfg != nil {
+		if modelCfg, err := cfg.GetModelConfig(modelName); err == nil && modelCfg != nil {
+			if ref := providers.ParseModelRef(modelCfg.Model, ""); ref != nil {
+				return ref.Provider, ref.Model
+			}
+			return "", strings.TrimSpace(modelCfg.Model)
+		}
+	}
+	ref := providers.ParseModelRef(modelName, "")
+	if ref == nil {
+		return "", modelName
+	}
+	return ref.Provider, ref.Model
 }
 
 // runAgentLoop is the core message processing logic.

pkg/agent/loop_test.go

@@ -401,7 +401,7 @@ func TestNewSessionCommand_SuccessAndIsolation(t *testing.T) {
 		ChatID:   "chat1",
 		Content:  "/new",
 	})
-	if response != "Starting a new conversation..." {
+	if response != "Starting a new conversation... (model: test-model)" {
 		t.Fatalf("Expected confirmation response, got %q", response)
 	}
 
@@ -435,6 +435,44 @@ func TestNewSessionCommand_SuccessAndIsolation(t *testing.T) {
 	}
 }
 
+func TestNewSessionCommand_IncludesProviderWhenPrefixed(t *testing.T) {
+	provider := &simpleMockProvider{response: "OK"}
+	tmpDir, err := os.MkdirTemp("", "agent-test-*")
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	cfg := &config.Config{
+		Agents: config.AgentsConfig{
+			Defaults: config.AgentDefaults{
+				Workspace:         tmpDir,
+				Model:             "openai/gpt-5.2",
+				MaxTokens:         4096,
+				MaxToolIterations: 10,
+			},
+		},
+	}
+
+	msgBus := bus.NewMessageBus()
+	al := NewAgentLoop(cfg, msgBus, provider)
+	if al.registry.GetDefaultAgent() == nil {
+		t.Fatal("No default agent found")
+	}
+
+	helper := testHelper{al: al}
+	ctx := context.Background()
+	response := helper.executeAndGetResponse(t, ctx, bus.InboundMessage{
+		Channel:  "test",
+		SenderID: "user1",
+		ChatID:   "chat1",
+		Content:  "/new",
+	})
+	if response != "Starting a new conversation... (provider: openai, model: gpt-5.2)" {
+		t.Fatalf("Expected confirmation response, got %q", response)
+	}
+}
+
 func TestNewSessionCommand_RejectsArgs(t *testing.T) {
 	provider := &simpleMockProvider{response: "OK"}
 	al, tmpDir := newTestAgentLoop(t, provider)
@@ -526,7 +564,7 @@ func TestNewSessionCommand_NoCrossChatImpact(t *testing.T) {
 			"peer_id":   "group1",
 		},
 	})
-	if response != "Starting a new conversation..." {
+	if response != "Starting a new conversation... (model: test-model)" {
 		t.Fatalf("Expected confirmation response, got %q", response)
 	}