3 files changed, 11 insertions, 9 deletions
diff --git a/packages/cli/src/ui/components/Help.tsx b/packages/cli/src/ui/components/Help.tsx
index c51867af..ecad9b5e 100644
--- a/packages/cli/src/ui/components/Help.tsx
+++ b/packages/cli/src/ui/components/Help.tsx
@@ -10,7 +10,7 @@ import { Colors } from '../colors.js';
 import { SlashCommand } from '../commands/types.js';
 
 interface Help {
-  commands: SlashCommand[];
+  commands: readonly SlashCommand[];
 }
 
 export const Help: React.FC<Help> = ({ commands }) => (
diff --git a/packages/cli/src/ui/components/InputPrompt.test.tsx b/packages/cli/src/ui/components/InputPrompt.test.tsx
index 6b201901..886a6235 100644
--- a/packages/cli/src/ui/components/InputPrompt.test.tsx
+++ b/packages/cli/src/ui/components/InputPrompt.test.tsx
@@ -451,13 +451,13 @@ describe('InputPrompt', () => {
     unmount();
   });
 
-  it('should complete a command based on its altName', async () => {
-    // Add a command with an altName to our mock for this test
+  it('should complete a command based on its altNames', async () => {
+    // Add a command with an altNames to our mock for this test
     props.slashCommands.push({
       name: 'help',
-      altName: '?',
+      altNames: ['?'],
       description: '...',
-    });
+    } as SlashCommand);
 
     mockedUseCompletion.mockReturnValue({
       ...mockCompletion,
diff --git a/packages/cli/src/ui/components/InputPrompt.tsx b/packages/cli/src/ui/components/InputPrompt.tsx
index 46326431..b7c53196 100644
--- a/packages/cli/src/ui/components/InputPrompt.tsx
+++ b/packages/cli/src/ui/components/InputPrompt.tsx
@@ -32,7 +32,7 @@ export interface InputPromptProps {
   userMessages: readonly string[];
   onClearScreen: () => void;
   config: Config;
-  slashCommands: SlashCommand[];
+  slashCommands: readonly SlashCommand[];
   commandContext: CommandContext;
   placeholder?: string;
   focus?: boolean;
@@ -180,18 +180,20 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
         // If there's no trailing space, we need to check if the current query
         // is already a complete path to a parent command.
         if (!hasTrailingSpace) {
-          let currentLevel: SlashCommand[] | undefined = slashCommands;
+          let currentLevel: readonly SlashCommand[] | undefined = slashCommands;
           for (let i = 0; i < parts.length; i++) {
             const part = parts[i];
             const found: SlashCommand | undefined = currentLevel?.find(
-              (cmd) => cmd.name === part || cmd.altName === part,
+              (cmd) => cmd.name === part || cmd.altNames?.includes(part),
             );
 
             if (found) {
               if (i === parts.length - 1 && found.subCommands) {
                 isParentPath = true;
               }
-              currentLevel = found.subCommands;
+              currentLevel = found.subCommands as
+                | readonly SlashCommand[]
+                | undefined;
             } else {
               // Path is invalid, so it can't be a parent path.
               currentLevel = undefined;