diff --git a/scripts/scenarios/start-app.ts b/scripts/scenarios/start-app.ts
index 5dee3f26c1..67af2bc885 100644
--- a/scripts/scenarios/start-app.ts
+++ b/scripts/scenarios/start-app.ts
@@ -75,8 +75,8 @@ const prepareHome = Effect.fn("startApp.prepareHome")(function* (home: string) {
           driver,
           {
             driver,
-            enabled: false,
-            ...(driver === "codex" ? { config: { binaryPath: noModel } } : {}),
+            enabled: driver === "codex",
+            ...(driver === "codex" ? { config: { binaryPath: "codex" } } : {}),
           },
         ]),
       ),
@@ -128,7 +128,7 @@ const startApp = Effect.fn("startApp")(function* (input: {
   yield* prepareHome(input.home);
   const env = {
     ...hostEnvironment,
-    PATH: `${path.join(input.home, "bin")}:${hostEnvironment.PATH ?? ""}`,
+    PATH: `${hostEnvironment.CODEX_SCENARIO_PATH}:${path.join(input.home, "bin")}:${hostEnvironment.PATH ?? ""}`,
     T3CODE_AUTO_BOOTSTRAP_PROJECT_FROM_CWD: "0",
   };
   const devRunner = (mode: string, args: ReadonlyArray<string>) => [