feat(plan): use placeholder for choice question "Other" option (#18101)

packages/core/src/confirmation-bus/types.ts

@@ -148,7 +148,7 @@ export interface Question {
   options?: QuestionOption[];
   /** Allow multiple selections. Only applies when type='choice'. */
   multiSelect?: boolean;
-  /** Placeholder hint text. Only applies when type='text'. */
+  /** Placeholder hint text. For type='text', shown in the input field. For type='choice', shown in the "Other" custom input. */
   placeholder?: string;
 }
 

packages/core/src/tools/ask-user.test.ts

@@ -177,6 +177,24 @@ describe('AskUserTool', () => {
       expect(result).toBeNull();
     });
 
+    it('should accept placeholder for choice type', () => {
+      const result = tool.validateToolParams({
+        questions: [
+          {
+            question: 'Which language?',
+            header: 'Language',
+            type: QuestionType.CHOICE,
+            options: [
+              { label: 'TypeScript', description: 'Typed JavaScript' },
+              { label: 'JavaScript', description: 'Dynamic language' },
+            ],
+            placeholder: 'Type another language...',
+          },
+        ],
+      });
+      expect(result).toBeNull();
+    });
+
     it('should return error if option has empty label', () => {
       const result = tool.validateToolParams({
         questions: [

packages/core/src/tools/ask-user.ts

@@ -90,7 +90,7 @@ export class AskUserTool extends BaseDeclarativeTool<
                 placeholder: {
                   type: 'string',
                   description:
-                    "Only applies when type='text'. Hint text shown in the input field.",
+                    "Hint text shown in the input field. For type='text', shown in the main input. For type='choice', shown in the 'Other' custom input.",
                 },
               },
             },