diff --git a/src/types.ts b/src/types.ts
index 226cce1..11f3343 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -18,14 +18,14 @@ export interface Session {
   cwd: string | null;
   command: string | null;
   // Phase 2.3: Session state and stats
-  state: string;
+  state: "ready" | "thinking" | "permission" | "question" | "complete" | "interrupted";
   prompts: number;
   completions: number;
   tools: number;
   compressions: number;
   thinking_seconds: number;
   work_seconds: number;
-  mode: string;
+  mode: "normal" | "auto_accept" | "plan";
   model: string | null;
   idle_since: number | null;
   // Git state (for later phase)