diff --git a/packages/cli/src/ui/App.tsx b/packages/cli/src/ui/App.tsx
index 5ddf13db..194a18cf 100644
--- a/packages/cli/src/ui/App.tsx
+++ b/packages/cli/src/ui/App.tsx
@@ -26,7 +26,7 @@ import { ConsoleOutput } from './components/ConsolePatcher.js';
 import { HistoryItemDisplay } from './components/HistoryItemDisplay.js';
 import { useCompletion } from './hooks/useCompletion.js';
 import { SuggestionsDisplay } from './components/SuggestionsDisplay.js';
-import { isAtCommand } from './utils/commandUtils.js';
+import { isAtCommand, isSlashCommand } from './utils/commandUtils.js';
 
 interface AppProps {
   config: Config;
@@ -96,7 +96,8 @@ export const App = ({ config, settings, cliVersion }: AppProps) => {
   const completion = useCompletion(
     query,
     config.getTargetDir(),
-    isInputActive && isAtCommand(query),
+    isInputActive && (isAtCommand(query) || isSlashCommand(query)),
+    slashCommands,
   );
 
   // --- Render Logic ---
diff --git a/packages/cli/src/ui/components/InputPrompt.tsx b/packages/cli/src/ui/components/InputPrompt.tsx
index fbf84766..1c8cff4d 100644
--- a/packages/cli/src/ui/components/InputPrompt.tsx
+++ b/packages/cli/src/ui/components/InputPrompt.tsx
@@ -47,25 +47,37 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
       return;
     }
     const selectedSuggestion = suggestions[activeSuggestionIndex];
-    const atIndex = query.lastIndexOf('@');
-    if (atIndex === -1) return;
+    const trimmedQuery = query.trimStart();
 
-    // Find the part of the query after the '@'
-    const pathPart = query.substring(atIndex + 1);
-    // Find the last slash within that part
-    const lastSlashIndexInPath = pathPart.lastIndexOf('/');
-
-    let base = '';
-    if (lastSlashIndexInPath === -1) {
-      // No slash after '@', replace everything after '@'
-      base = query.substring(0, atIndex + 1);
+    if (trimmedQuery.startsWith('/')) {
+      // Handle / command completion
+      const slashIndex = query.indexOf('/');
+      const base = query.substring(0, slashIndex + 1);
+      const newValue = base + selectedSuggestion.value;
+      setQuery(newValue);
     } else {
-      // Slash found, keep everything up to and including the last slash
-      base = query.substring(0, atIndex + 1 + lastSlashIndexInPath + 1);
+      // Handle @ command completion
+      const atIndex = query.lastIndexOf('@');
+      if (atIndex === -1) return;
+
+      // Find the part of the query after the '@'
+      const pathPart = query.substring(atIndex + 1);
+      // Find the last slash within that part
+      const lastSlashIndexInPath = pathPart.lastIndexOf('/');
+
+      let base = '';
+      if (lastSlashIndexInPath === -1) {
+        // No slash after '@', replace everything after '@'
+        base = query.substring(0, atIndex + 1);
+      } else {
+        // Slash found, keep everything up to and including the last slash
+        base = query.substring(0, atIndex + 1 + lastSlashIndexInPath + 1);
+      }
+
+      const newValue = base + selectedSuggestion.value;
+      setQuery(newValue);
     }
 
-    const newValue = base + selectedSuggestion.value;
-    setQuery(newValue);
     resetCompletion(); // Hide suggestions after selection
     setInputKey((k) => k + 1); // Increment key to force re-render and cursor reset
   }, [
diff --git a/packages/cli/src/ui/hooks/useCompletion.ts b/packages/cli/src/ui/hooks/useCompletion.ts
index 07a71630..31c59bcf 100644
--- a/packages/cli/src/ui/hooks/useCompletion.ts
+++ b/packages/cli/src/ui/hooks/useCompletion.ts
@@ -12,6 +12,8 @@ import {
   MAX_SUGGESTIONS_TO_SHOW,
   Suggestion,
 } from '../components/SuggestionsDisplay.js';
+import { SlashCommand } from './slashCommandProcessor.js';
+
 export interface UseCompletionReturn {
   suggestions: Suggestion[];
   activeSuggestionIndex: number;
@@ -29,6 +31,7 @@ export function useCompletion(
   query: string,
   cwd: string,
   isActive: boolean,
+  slashCommands: SlashCommand[],
 ): UseCompletionReturn {
   const [suggestions, setSuggestions] = useState<Suggestion[]>([]);
   const [activeSuggestionIndex, setActiveSuggestionIndex] =
@@ -111,6 +114,26 @@ export function useCompletion(
       return;
     }
 
+    const trimmedQuery = query.trimStart(); // Trim leading whitespace
+
+    // --- Handle Slash Command Completion ---
+    if (trimmedQuery.startsWith('/')) {
+      const partialCommand = trimmedQuery.substring(1);
+      const filteredSuggestions = slashCommands
+        .map((cmd) => cmd.name)
+        .filter((name) => name.startsWith(partialCommand))
+        .map((name) => ({ label: name, value: name }))
+        .sort();
+
+      setSuggestions(filteredSuggestions);
+      setShowSuggestions(filteredSuggestions.length > 0);
+      setActiveSuggestionIndex(-1);
+      setVisibleStartIndex(0);
+      setIsLoadingSuggestions(false);
+      return;
+    }
+
+    // --- Handle At Command Completion ---
     const atIndex = query.lastIndexOf('@');
     if (atIndex === -1) {
       resetCompletionState();
diff --git a/packages/cli/src/ui/utils/commandUtils.ts b/packages/cli/src/ui/utils/commandUtils.ts
index 64046658..bcae7b6c 100644
--- a/packages/cli/src/ui/utils/commandUtils.ts
+++ b/packages/cli/src/ui/utils/commandUtils.ts
@@ -16,6 +16,15 @@ export const isAtCommand = (query: string): boolean =>
   // Check if starts with @ OR has a space, then @, then a non-space character.
   query.startsWith('@') || /\s@\S/.test(query);
 
+/**
+ * Checks if a query string potentially represents an '/' command.
+ * It triggers if the query starts with '/'
+ *
+ * @param query The input query string.
+ * @returns True if the query looks like an '/' command, false otherwise.
+ */
+export const isSlashCommand = (query: string): boolean => query.startsWith('/');
+
 const control_symbols: string[] = ['/', '@', '!', '?', '$'];
 /**
  * Returns the first word of query with optional leading slash, ampersand, bang.