feat: wire real Claude API — OAuth login + live chat via Wails bindings

Replace mock responses in the XO copilot panel with real Wails binding
calls to the Go AIService backend:

- StartLogin now opens the browser via pkg/browser.OpenURL
- SendMessage returns ChatResponse (text + tool call results) instead of
  bare error, fixing the tool-call accumulation bug in messageLoop
- Add GetModel/SetModel methods for frontend model switching
- Frontend useCopilot composable calls Go via Call.ByName from
  @wailsio/runtime, with conversation auto-creation, auth checks, and
  error display in the chat panel
- Store defaults to isAuthenticated=false; panel checks auth on mount
- CopilotSettings syncs model changes and logout to the backend

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

frontend/src/components/copilot/CopilotPanel.vue

@@ -50,7 +50,7 @@
       </p>
       <button
         class="px-4 py-2 text-sm font-medium text-white bg-[#1f6feb] hover:bg-[#388bfd] rounded transition-colors cursor-pointer"
-        @click="store.startLogin()"
+        @click="handleConnectLogin"
       >
         Connect to Claude
       </button>
@@ -126,14 +126,20 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed, watch, nextTick } from "vue";
+import { ref, computed, watch, nextTick, onMounted } from "vue";
 import { useCopilotStore } from "@/stores/copilot.store";
 import { useCopilot } from "@/composables/useCopilot";
 import CopilotMessage from "./CopilotMessage.vue";
 import CopilotSettings from "./CopilotSettings.vue";
 
 const store = useCopilotStore();
-const { processMessage } = useCopilot();
+const { processMessage, checkAuth, startLogin, getModel } = useCopilot();
+
+// Check auth status and load model on mount
+onMounted(async () => {
+  await checkAuth();
+  await getModel();
+});
 
 const panelWidth = 320;
 const inputText = ref("");
@@ -149,6 +155,12 @@ const modelShort = computed(() => {
   return m;
 });
 
+/** Trigger OAuth login from the inline panel button. */
+async function handleConnectLogin(): Promise<void> {
+  await startLogin();
+  store.isAuthenticated = true;
+}
+
 /** Token formatter. */
 function formatTokens(n: number): string {
   if (n >= 1000) return (n / 1000).toFixed(1) + "K";

frontend/src/components/copilot/CopilotSettings.vue

@@ -96,19 +96,23 @@
 </template>
 
 <script setup lang="ts">
-import { ref } from "vue";
+import { ref, watch } from "vue";
 import { useCopilotStore } from "@/stores/copilot.store";
+import { useCopilot } from "@/composables/useCopilot";
 
 const store = useCopilotStore();
+const { startLogin, logout, setModel } = useCopilot();
 const apiKey = ref("");
 
 const emit = defineEmits<{
   (e: "close"): void;
 }>();
 
-function handleLogin(): void {
-  // TODO: Wails AIService.StartLogin()
-  store.startLogin();
+async function handleLogin(): Promise<void> {
+  await startLogin();
+  // Auth state will be updated when the OAuth callback completes
+  // and the panel re-checks on next interaction.
+  store.isAuthenticated = true;
   emit("close");
 }
 
@@ -125,8 +129,8 @@ function handleClearHistory(): void {
   emit("close");
 }
 
-function handleDisconnect(): void {
-  store.disconnect();
+async function handleDisconnect(): Promise<void> {
+  await logout();
   emit("close");
 }
 
@@ -134,4 +138,12 @@ function formatTokens(n: number): string {
   if (n >= 1000) return (n / 1000).toFixed(1) + "K";
   return String(n);
 }
+
+// Sync model changes to the Go backend
+watch(
+  () => store.model,
+  (newModel) => {
+    setModel(newModel);
+  },
+);
 </script>

frontend/src/composables/useCopilot.ts

@@ -1,177 +1,150 @@
 import { useCopilotStore } from "@/stores/copilot.store";
 import type { ToolCall } from "@/stores/copilot.store";
+import { Call } from "@wailsio/runtime";
 
 /**
- * Composable providing mock Wails binding wrappers for the AI copilot.
+ * Fully qualified Go method name prefix for AIService bindings.
+ * Wails v3 ByName format: 'package.struct.method'
+ */
+const AI = "github.com/vstockwell/wraith/internal/ai.AIService";
+
+/** Call a bound Go method on AIService by name. */
+async function callAI<T = unknown>(method: string, ...args: unknown[]): Promise<T> {
+  return Call.ByName(`${AI}.${method}`, ...args) as Promise<T>;
+}
+
+/** Shape returned by Go AIService.SendMessage. */
+interface ChatResponse {
+  text: string;
+  toolCalls?: {
+    name: string;
+    input: unknown;
+    result: unknown;
+    error?: string;
+  }[];
+}
+
+/**
+ * Composable providing real Wails binding wrappers for the AI copilot.
  *
- * All functions simulate Claude-style behavior until real Wails bindings
- * (AIService.*) are connected.
+ * Calls the Go AIService via Wails v3 Call.ByName. SendMessage blocks
+ * until the full response (including tool-use loops) is complete.
  */
 export function useCopilot() {
   const store = useCopilotStore();
 
-  /** Simulate word-by-word streaming output. */
-  async function mockStream(
-    text: string,
-    onDelta: (word: string) => void,
-  ): Promise<void> {
-    const words = text.split(" ");
-    for (const word of words) {
-      await new Promise((r) => setTimeout(r, 30 + Math.random() * 70));
-      onDelta(word + " ");
-    }
-  }
-
-  /** Simulate a tool call execution with realistic delay. */
-  async function mockToolCall(
-    name: string,
-    _input: Record<string, unknown>,
-  ): Promise<unknown> {
-    await new Promise((r) => setTimeout(r, 500 + Math.random() * 1000));
-
-    if (name === "list_sessions") return [];
-    if (name === "terminal_read") {
-      return {
-        lines: [
-          "$ systemctl status nginx",
-          "● nginx.service - A high performance web server",
-          "   Loaded: loaded (/lib/systemd/system/nginx.service; enabled)",
-          "   Active: active (running) since Mon 2026-03-17 08:30:12 UTC",
-          "   Main PID: 1234 (nginx)",
-          "   Tasks: 5 (limit: 4915)",
-          "   Memory: 12.4M",
-        ],
-      };
-    }
-    if (name === "terminal_write") return { status: "ok" };
-    if (name === "rdp_screenshot") {
-      return { thumbnail: "data:image/jpeg;base64,/9j/4AAQ..." };
-    }
-    if (name === "rdp_click") return { status: "ok" };
-    if (name === "rdp_type") return { status: "ok" };
-    if (name === "sftp_read") return { content: "# example file content" };
-    if (name === "sftp_write") return { bytesWritten: 1024 };
-
-    return { status: "ok" };
-  }
-
   /**
-   * Process a user message — route to the appropriate mock response.
-   *
-   * Routes:
-   * - "hello"/"hey" -> greeting
-   * - "ssh"/"server"/"check" -> terminal tool calls
-   * - "rdp"/"desktop"/"screen" -> RDP screenshot tool call
-   * - default -> list_sessions assessment
+   * Process a user message by calling the real Go backend.
+   * The backend blocks until the full response is ready (no streaming yet).
    */
   async function processMessage(text: string): Promise<void> {
-    const lower = text.toLowerCase();
-
     store.isStreaming = true;
-    const assistantMsg = store.createAssistantMessage();
 
+    // Ensure we have a conversation
+    if (!store.activeConversationId) {
       try {
-      if (/\b(hello|hey|hi)\b/.test(lower)) {
-        await mockStream(
-          "XO online. I have access to your active sessions. What's the mission, Commander?",
-          (word) => store.appendStreamDelta(word),
-        );
-      } else if (/\b(ssh|server|check|nginx|status)\b/.test(lower)) {
-        await mockStream(
-          "On it. Let me check the server status.",
-          (word) => store.appendStreamDelta(word),
-        );
-
-        // Tool call 1: terminal_write
-        const writeCallId = `tc-${Date.now()}-1`;
-        const writeCall: ToolCall = {
-          id: writeCallId,
-          name: "terminal_write",
-          input: { sessionId: "s1", text: "systemctl status nginx" },
-          status: "pending",
-        };
-        store.addToolCall(writeCall);
-
-        const writeResult = await mockToolCall("terminal_write", writeCall.input);
-        store.completeToolCall(writeCallId, writeResult);
-
-        // Tool call 2: terminal_read
-        const readCallId = `tc-${Date.now()}-2`;
-        const readCall: ToolCall = {
-          id: readCallId,
-          name: "terminal_read",
-          input: { sessionId: "s1", lines: 20 },
-          status: "pending",
-        };
-        store.addToolCall(readCall);
-
-        const readResult = await mockToolCall("terminal_read", readCall.input);
-        store.completeToolCall(readCallId, readResult);
-
-        // Summary
-        store.appendStreamDelta("\n\n");
-        await mockStream(
-          "Nginx is **active and running**. The service has been up since 08:30 UTC today, using 12.4M of memory with 5 active tasks. Everything looks healthy.",
-          (word) => store.appendStreamDelta(word),
-        );
-      } else if (/\b(rdp|desktop|screen|screenshot)\b/.test(lower)) {
-        await mockStream(
-          "Taking a screenshot of the remote desktop.",
-          (word) => store.appendStreamDelta(word),
-        );
-
-        // Tool call: rdp_screenshot
-        const callId = `tc-${Date.now()}`;
-        const call: ToolCall = {
-          id: callId,
-          name: "rdp_screenshot",
-          input: { sessionId: "s2" },
-          status: "pending",
-        };
-        store.addToolCall(call);
-
-        const result = await mockToolCall("rdp_screenshot", call.input);
-        store.completeToolCall(callId, result);
-
-        store.appendStreamDelta("\n\n");
-        await mockStream(
-          "I can see the Windows desktop. The screen shows the default wallpaper with a few application shortcuts. No error dialogs or unusual activity detected.",
-          (word) => store.appendStreamDelta(word),
-        );
-      } else {
-        await mockStream(
-          "Understood. Let me assess the situation.",
-          (word) => store.appendStreamDelta(word),
-        );
-
-        // Tool call: list_sessions
-        const callId = `tc-${Date.now()}`;
-        const call: ToolCall = {
-          id: callId,
-          name: "list_sessions",
-          input: {},
-          status: "pending",
-        };
-        store.addToolCall(call);
-
-        const result = await mockToolCall("list_sessions", call.input);
-        store.completeToolCall(callId, result);
-
-        store.appendStreamDelta("\n\n");
-        await mockStream(
-          "I've reviewed your current sessions. No active connections detected at the moment. Would you like me to connect to a specific server or run a diagnostic?",
-          (word) => store.appendStreamDelta(word),
-        );
+        const convId = await callAI<string>("NewConversation");
+        store.activeConversationId = convId;
+      } catch (err) {
+        store.messages.push({
+          id: `msg-${Date.now()}`,
+          role: "assistant",
+          content: `Error creating conversation: ${err}`,
+          timestamp: Date.now(),
+        });
+        store.isStreaming = false;
+        return;
+      }
     }
 
-      // Track mock output tokens
-      store.tokenUsage.output += Math.ceil(
-        (assistantMsg.content.length) / 4,
+    try {
+      const response = await callAI<ChatResponse>(
+        "SendMessage",
+        store.activeConversationId,
+        text,
       );
+
+      // Build the assistant message from the response
+      const toolCalls: ToolCall[] | undefined = response.toolCalls?.map(
+        (tc) => ({
+          id: `tc-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
+          name: tc.name,
+          input: (tc.input ?? {}) as Record<string, unknown>,
+          result: tc.result,
+          status: (tc.error ? "error" : "done") as "done" | "error",
+        }),
+      );
+
+      store.messages.push({
+        id: `msg-${Date.now()}`,
+        role: "assistant",
+        content: response.text || "",
+        toolCalls: toolCalls,
+        timestamp: Date.now(),
+      });
+    } catch (err) {
+      store.messages.push({
+        id: `msg-${Date.now()}`,
+        role: "assistant",
+        content: `Error: ${err}`,
+        timestamp: Date.now(),
+      });
     } finally {
       store.isStreaming = false;
     }
   }
 
-  return { mockStream, mockToolCall, processMessage };
+  /** Begin the OAuth login flow (opens browser). */
+  async function startLogin(): Promise<void> {
+    try {
+      await callAI("StartLogin");
+    } catch (err) {
+      console.error("StartLogin failed:", err);
+    }
+  }
+
+  /** Check whether the user is authenticated. */
+  async function checkAuth(): Promise<boolean> {
+    try {
+      const authed = await callAI<boolean>("IsAuthenticated");
+      store.isAuthenticated = authed;
+      return authed;
+    } catch {
+      return false;
+    }
+  }
+
+  /** Log out and clear tokens. */
+  async function logout(): Promise<void> {
+    try {
+      await callAI("Logout");
+      store.isAuthenticated = false;
+      store.clearHistory();
+    } catch (err) {
+      console.error("Logout failed:", err);
+    }
+  }
+
+  /** Sync the model setting to the Go backend. */
+  async function setModel(model: string): Promise<void> {
+    try {
+      await callAI("SetModel", model);
+      store.model = model;
+    } catch (err) {
+      console.error("SetModel failed:", err);
+    }
+  }
+
+  /** Load the current model from the Go backend. */
+  async function getModel(): Promise<string> {
+    try {
+      const m = await callAI<string>("GetModel");
+      store.model = m;
+      return m;
+    } catch {
+      return store.model;
+    }
+  }
+
+  return { processMessage, startLogin, checkAuth, logout, setModel, getModel };
 }

frontend/src/stores/copilot.store.ts

@@ -30,16 +30,17 @@ export interface ConversationSummary {
  * Copilot (XO) store.
  * Manages the AI assistant panel state, messages, and streaming.
  *
- * All Wails AIService calls are TODOs with mock behavior for now.
+ * Backend calls are handled by the useCopilot composable;
+ * this store manages purely reactive UI state.
  */
 export const useCopilotStore = defineStore("copilot", () => {
   const isPanelOpen = ref(false);
-  const isAuthenticated = ref(true); // default true for mock
+  const isAuthenticated = ref(false);
   const isStreaming = ref(false);
   const activeConversationId = ref<string | null>(null);
   const messages = ref<Message[]>([]);
   const conversations = ref<ConversationSummary[]>([]);
-  const model = ref("claude-sonnet-4-5-20250514");
+  const model = ref("claude-sonnet-4-20250514");
   const tokenUsage = ref({ input: 0, output: 0 });
   const showSettings = ref(false);
 
@@ -48,21 +49,14 @@ export const useCopilotStore = defineStore("copilot", () => {
     isPanelOpen.value = !isPanelOpen.value;
   }
 
-  /** Start OAuth login flow. */
-  function startLogin(): void {
-    // TODO: Wails AIService.StartLogin()
-    isAuthenticated.value = true;
-  }
-
-  /** Start a new conversation. */
+  /** Start a new conversation (resets local state). */
   function newConversation(): void {
-    // TODO: Wails AIService.NewConversation()
-    activeConversationId.value = `conv-${Date.now()}`;
+    activeConversationId.value = null;
     messages.value = [];
     tokenUsage.value = { input: 0, output: 0 };
   }
 
-  /** Send a user message and trigger a mock XO response. */
+  /** Add a user message to the local message list. */
   function sendMessage(text: string): void {
     const userMsg: Message = {
       id: `msg-${Date.now()}`,
@@ -72,12 +66,8 @@ export const useCopilotStore = defineStore("copilot", () => {
     };
     messages.value.push(userMsg);
 
-    // Track mock input tokens
+    // Rough token estimate for display purposes
     tokenUsage.value.input += Math.ceil(text.length / 4);
-
-    if (!activeConversationId.value) {
-      activeConversationId.value = `conv-${Date.now()}`;
-    }
   }
 
   /** Append a streaming text delta to the latest assistant message. */
@@ -138,7 +128,7 @@ export const useCopilotStore = defineStore("copilot", () => {
 
   /** Load conversation list from backend. */
   async function loadConversations(): Promise<void> {
-    // TODO: Wails AIService.ListConversations()
+    // TODO: wire to AIService.ListConversations when conversation history UI is built
     conversations.value = [];
   }
 
@@ -149,13 +139,6 @@ export const useCopilotStore = defineStore("copilot", () => {
     tokenUsage.value = { input: 0, output: 0 };
   }
 
-  /** Disconnect from Claude (reset auth state). */
-  function disconnect(): void {
-    // TODO: Wails AIService.Disconnect()
-    isAuthenticated.value = false;
-    clearHistory();
-  }
-
   return {
     isPanelOpen,
     isAuthenticated,
@@ -167,7 +150,6 @@ export const useCopilotStore = defineStore("copilot", () => {
     tokenUsage,
     showSettings,
     togglePanel,
-    startLogin,
     newConversation,
     sendMessage,
     appendStreamDelta,
@@ -177,6 +159,5 @@ export const useCopilotStore = defineStore("copilot", () => {
     failToolCall,
     loadConversations,
     clearHistory,
-    disconnect,
   };
 });

internal/ai/service.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"log/slog"
 	"sync"
+
+	"github.com/pkg/browser"
 )
 
 // SystemPrompt is the system prompt given to Claude for copilot interactions.
@@ -46,11 +48,25 @@ func NewAIService(oauth *OAuthManager, router *ToolRouter, convMgr *Conversation
 	}
 }
 
+// ChatResponse is returned to the frontend after a complete AI turn.
+type ChatResponse struct {
+	Text      string           `json:"text"`
+	ToolCalls []ToolCallResult `json:"toolCalls,omitempty"`
+}
+
+// ToolCallResult captures a single tool invocation and its outcome.
+type ToolCallResult struct {
+	Name   string      `json:"name"`
+	Input  interface{} `json:"input"`
+	Result interface{} `json:"result"`
+	Error  string      `json:"error,omitempty"`
+}
+
 // --- Auth ---
 
 // StartLogin begins the OAuth PKCE flow, opening the browser for authentication.
 func (s *AIService) StartLogin() error {
-	done, err := s.oauth.StartLogin(nil) // nil openURL = no browser auto-open
+	done, err := s.oauth.StartLogin(browser.OpenURL)
 	if err != nil {
 		return err
 	}
@@ -101,7 +117,8 @@ func (s *AIService) DeleteConversation(id string) error {
 // SendMessage sends a user message in a conversation and processes the AI response.
 // Tool calls are automatically dispatched and results fed back to the model.
 // This method blocks until the full response (including any tool use loops) is complete.
-func (s *AIService) SendMessage(conversationId, text string) error {
+// It returns the aggregated text and tool-call results from all iterations.
+func (s *AIService) SendMessage(conversationId, text string) (*ChatResponse, error) {
 	// Add user message to conversation
 	userMsg := Message{
 		Role: "user",
@@ -110,7 +127,7 @@ func (s *AIService) SendMessage(conversationId, text string) error {
 		},
 	}
 	if err := s.conversations.AddMessage(conversationId, userMsg); err != nil {
-		return fmt.Errorf("store user message: %w", err)
+		return nil, fmt.Errorf("store user message: %w", err)
 	}
 
 	// Run the message loop (handles tool use)
@@ -118,21 +135,26 @@ func (s *AIService) SendMessage(conversationId, text string) error {
 }
 
 // messageLoop sends the conversation to Claude and handles tool use loops.
-func (s *AIService) messageLoop(conversationId string) error {
+// It returns the aggregated ChatResponse containing all text and tool-call results.
+func (s *AIService) messageLoop(conversationId string) (*ChatResponse, error) {
+	resp := &ChatResponse{}
+
 	for iterations := 0; iterations < 20; iterations++ { // safety limit
 		messages, err := s.conversations.GetMessages(conversationId)
 		if err != nil {
-			return err
+			return nil, err
 		}
 
 		ch, err := s.client.SendMessage(messages, CopilotTools, SystemPrompt)
 		if err != nil {
-			return fmt.Errorf("send to claude: %w", err)
+			return nil, fmt.Errorf("send to claude: %w", err)
 		}
 
 		// Collect the response
 		var textParts []string
 		var toolCalls []ContentBlock
+		var currentToolID string
+		var currentToolName string
 		var currentToolInput string
 
 		for event := range ch {
@@ -140,10 +162,33 @@ func (s *AIService) messageLoop(conversationId string) error {
 			case "text_delta":
 				textParts = append(textParts, event.Data)
 			case "tool_use_start":
+				// Finalize any previous tool call
+				if currentToolID != "" {
+					toolCalls = append(toolCalls, ContentBlock{
+						Type:  "tool_use",
+						ID:    currentToolID,
+						Name:  currentToolName,
+						Input: json.RawMessage(currentToolInput),
+					})
+				}
+				currentToolID = event.ToolID
+				currentToolName = event.ToolName
 				currentToolInput = ""
 			case "tool_use_delta":
 				currentToolInput += event.Data
 			case "done":
+				// Finalize any in-progress tool call
+				if currentToolID != "" {
+					toolCalls = append(toolCalls, ContentBlock{
+						Type:  "tool_use",
+						ID:    currentToolID,
+						Name:  currentToolName,
+						Input: json.RawMessage(currentToolInput),
+					})
+					currentToolID = ""
+					currentToolName = ""
+					currentToolInput = ""
+				}
 				// Parse usage if available
 				var delta struct {
 					Usage Usage `json:"usage"`
@@ -152,17 +197,22 @@ func (s *AIService) messageLoop(conversationId string) error {
 					s.conversations.UpdateTokenUsage(conversationId, delta.Usage.InputTokens, delta.Usage.OutputTokens)
 				}
 			case "error":
-				return fmt.Errorf("stream error: %s", event.Data)
+				return nil, fmt.Errorf("stream error: %s", event.Data)
+			}
 		}
 
-			// When a tool_use block completes, we need to check content_block_stop
-			// But since we accumulate, we'll finalize after the stream ends
-			_ = toolCalls // kept for the final assembly below
+		// Finalize any trailing tool call (if stream ended without a "done" event)
+		if currentToolID != "" {
+			toolCalls = append(toolCalls, ContentBlock{
+				Type:  "tool_use",
+				ID:    currentToolID,
+				Name:  currentToolName,
+				Input: json.RawMessage(currentToolInput),
+			})
 		}
 
 		// Build the assistant message
 		var assistantContent []ContentBlock
-		if len(textParts) > 0 {
 		fullText := ""
 		for _, p := range textParts {
 			fullText += p
@@ -172,14 +222,14 @@ func (s *AIService) messageLoop(conversationId string) error {
 				Type: "text",
 				Text: fullText,
 			})
-			}
+			resp.Text += fullText
 		}
 		for _, tc := range toolCalls {
 			assistantContent = append(assistantContent, tc)
 		}
 
 		if len(assistantContent) == 0 {
-			return nil // empty response
+			return resp, nil // empty response
 		}
 
 		// Store assistant message
@@ -188,7 +238,7 @@ func (s *AIService) messageLoop(conversationId string) error {
 			Content: assistantContent,
 		}
 		if err := s.conversations.AddMessage(conversationId, assistantMsg); err != nil {
-			return fmt.Errorf("store assistant message: %w", err)
+			return nil, fmt.Errorf("store assistant message: %w", err)
 		}
 
 		// If there were tool calls, dispatch them and continue the loop
@@ -201,7 +251,7 @@ func (s *AIService) messageLoop(conversationId string) error {
 		}
 
 		if !hasToolUse {
-			return nil // done, no tool use to process
+			return resp, nil // done, no tool use to process
 		}
 
 		// Dispatch tool calls and create tool_result message
@@ -211,24 +261,32 @@ func (s *AIService) messageLoop(conversationId string) error {
 				continue
 			}
 
-			result, err := s.router.Dispatch(block.Name, block.Input)
+			result, dispatchErr := s.router.Dispatch(block.Name, block.Input)
 			resultBlock := ContentBlock{
 				Type:      "tool_result",
 				ToolUseID: block.ID,
 			}
 
-			if err != nil {
+			tcResult := ToolCallResult{
+				Name:  block.Name,
+				Input: block.Input,
+			}
+
+			if dispatchErr != nil {
 				resultBlock.IsError = true
 				resultBlock.Content = []ContentBlock{
-					{Type: "text", Text: err.Error()},
+					{Type: "text", Text: dispatchErr.Error()},
 				}
+				tcResult.Error = dispatchErr.Error()
 			} else {
 				resultJSON, _ := json.Marshal(result)
 				resultBlock.Content = []ContentBlock{
 					{Type: "text", Text: string(resultJSON)},
 				}
+				tcResult.Result = result
 			}
 			toolResults = append(toolResults, resultBlock)
+			resp.ToolCalls = append(resp.ToolCalls, tcResult)
 		}
 
 		toolResultMsg := Message{
@@ -236,13 +294,25 @@ func (s *AIService) messageLoop(conversationId string) error {
 			Content: toolResults,
 		}
 		if err := s.conversations.AddMessage(conversationId, toolResultMsg); err != nil {
-			return fmt.Errorf("store tool results: %w", err)
+			return nil, fmt.Errorf("store tool results: %w", err)
 		}
 
 		// Continue the loop to let Claude process tool results
 	}
 
-	return fmt.Errorf("exceeded maximum tool use iterations")
+	return nil, fmt.Errorf("exceeded maximum tool use iterations")
+}
+
+// --- Model ---
+
+// GetModel returns the current Claude model identifier.
+func (s *AIService) GetModel() string {
+	return s.client.model
+}
+
+// SetModel changes the Claude model used for subsequent requests.
+func (s *AIService) SetModel(model string) {
+	s.client.model = model
 }
 
 // --- Terminal Buffer Management ---