diff --git a/scripts/e2e.config.ts b/scripts/e2e.config.ts
index dc10e32f7a..effaaf6c68 100644
--- a/scripts/e2e.config.ts
+++ b/scripts/e2e.config.ts
@@ -152,7 +152,7 @@ export default {
   targets: [
     {
       name: "web",
-      engine: web({ viewport: { width: 1280, height: 800 } }),
+      engine: web({ viewport: { width: 1280, height: 1000 } }),
       app: {
         url: `http://${LOOPBACK}:0`,
         // Vite answers before the server does; this path is proxied to the server.
diff --git a/scripts/prove-scenario.ts b/scripts/prove-scenario.ts
index 68e5433ebe..cc0756582e 100644
--- a/scripts/prove-scenario.ts
+++ b/scripts/prove-scenario.ts
@@ -313,11 +313,14 @@ const prove = Effect.fn("prove")(function* (input: {
   const proveDir = path.join(scripts, ".e2e/prove");
   const scenarioPath = path.resolve(yield* HostProcess.WorkingDirectory, input.scenario);
   // A proof left by an earlier run must not be read as this one's.
-  yield* fs.remove(proveDir, { recursive: true, force: true });
+  if (process.env.T3_PROOF_SIDE !== "head") yield* fs.remove(proveDir, { recursive: true, force: true });
   yield* fs.makeDirectory(proveDir, { recursive: true });
   // Only that target's app starts: a web scenario needs no Metro and no device.
   const target = Option.getOrElse(input.target, () => "") || (yield* targetOf(scenarioPath));
-  const base = yield* runSide("base", input.base, scenarioPath, target);
+  const base = process.env.T3_PROOF_SIDE === "head"
+    ? JSON.parse(yield* fs.readFileString(path.join(proveDir, "base.json")))
+    : yield* runSide("base", input.base, scenarioPath, target);
+  if (process.env.T3_PROOF_SIDE === "base") return 0;
   const head = yield* runSide("head", input.head, scenarioPath, target);
   const links = Option.isSome(input.uploadCommand)
     ? yield* upload(input.uploadCommand.value, [...base.captures, ...head.captures])
diff --git a/scripts/scenarios/start-app.ts b/scripts/scenarios/start-app.ts
index 5dee3f26c1..3ad8a0bc6b 100644
--- a/scripts/scenarios/start-app.ts
+++ b/scripts/scenarios/start-app.ts
@@ -58,6 +58,9 @@ const prepareHome = Effect.fn("startApp.prepareHome")(function* (home: string) {
   yield* fs.remove(home, { recursive: true, force: true });
   yield* fs.makeDirectory(path.join(home, "userdata"), { recursive: true });
   yield* fs.makeDirectory(path.join(home, "bin"));
+  const installHome = path.join(home, "install-home");
+  yield* fs.makeDirectory(installHome, { recursive: true });
+  yield* fs.writeFileString(path.join(installHome, ".bashrc"), 'export PS1="setup$ "\nexport PATH="$HOME/.local/bin:$PATH"\n');
   for (const command of ["hostnamectl", "scutil"]) {
     const shim = path.join(home, "bin", command);
     yield* fs.writeFileString(shim, HOST_LABEL_SHIM);
@@ -75,7 +78,8 @@ const prepareHome = Effect.fn("startApp.prepareHome")(function* (home: string) {
           driver,
           {
             driver,
-            enabled: false,
+            enabled: driver === "claudeAgent",
+            ...(driver === "claudeAgent" ? { config: { binaryPath: path.join(home, "install-home/.local/bin/claude") } } : {}),
             ...(driver === "codex" ? { config: { binaryPath: noModel } } : {}),
           },
         ]),
@@ -128,6 +132,9 @@ const startApp = Effect.fn("startApp")(function* (input: {
   yield* prepareHome(input.home);
   const env = {
     ...hostEnvironment,
+    HOME: path.join(input.home, "install-home"),
+    SHELL: "/bin/bash",
+    T3CODE_DEV_SEED: "0",
     PATH: `${path.join(input.home, "bin")}:${hostEnvironment.PATH ?? ""}`,
     T3CODE_AUTO_BOOTSTRAP_PROJECT_FROM_CWD: "0",
   };