diff --git a/src/types.ts b/src/types.ts
index eca8ef3..14bba7b 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -35,6 +35,49 @@ export interface OutputLog {
   line: string;
 }
 
+// Phase 2: Rich prompt system interfaces
+// Represents the structured data format for interactive prompts from Claude Code
+
+export interface PromptOption {
+  label: string;
+  value: string;
+  description?: string;
+}
+
+export interface PermissionPrompt {
+  prompt_type: "permission";
+  tool_name: string;
+  tool_input: Record<string, unknown>;
+  options: PromptOption[];
+  allows_tab_instructions: boolean;
+  selected_option: number;
+}
+
+export interface QuestionItem {
+  question: string;
+  header?: string;
+  options: PromptOption[];
+  multi_select: boolean;
+  allows_other: boolean;
+}
+
+export interface QuestionPrompt {
+  prompt_type: "question";
+  questions: QuestionItem[];
+}
+
+export interface ExitPlanPrompt {
+  prompt_type: "exit_plan";
+  options: PromptOption[];
+}
+
+export type PromptData = PermissionPrompt | QuestionPrompt | ExitPlanPrompt | null;
+
+export type AnswerResponse =
+  | { type: "option"; value: string }
+  | { type: "text"; value: string }
+  | { type: "tab_instructions"; selected_option: number; instruction: string };
+
 // WebSocket messages (CLI <-> Server)
 
 export type ClientMessage =