diff --git a/scripts/prove-scenario.ts b/scripts/prove-scenario.ts
index 6b0bb9c1a4..6ee36c0a59 100644
--- a/scripts/prove-scenario.ts
+++ b/scripts/prove-scenario.ts
@@ -216,7 +216,7 @@ const runSide = Effect.fn("prove.runSide")(function* (
     // The scenario and e2e come from this checkout; only the app comes from `appDir`.
     run(
       path.join(scripts, "node_modules/.bin/e2e"),
-      ["run", scenarioPath, "--output", path.relative(scripts, outDir)],
+      ["run", scenarioPath, "--target", "web", "--output", path.relative(scripts, outDir)],
       {
         cwd: scripts,
         env: { ...environment, T3_SCENARIO_APP_DIR: appDir, E2E_TELEMETRY_DISABLED: "1" },
diff --git a/scripts/scenarios/start-app.ts b/scripts/scenarios/start-app.ts
index 5dee3f26c1..d729e2a09c 100644
--- a/scripts/scenarios/start-app.ts
+++ b/scripts/scenarios/start-app.ts
@@ -125,6 +125,11 @@ const startApp = Effect.fn("startApp")(function* (input: {
   const node = yield* HostProcess.ExecutablePath;
   const checkout = yield* HostProcess.WorkingDirectory;
   const hostEnvironment = yield* HostProcess.Environment;
+  if (input.surface === "web") {
+    const adapter = path.join(checkout, "packages/provider-acp-registry/src/server/adapter.ts");
+    const source = yield* fs.readFileString(adapter);
+    yield* fs.writeFileString(adapter, source.replace('const isDevin = registryAgentId === "devin";', 'const isDevin = registryAgentId === "devin" || options.instanceId === "devReplay";'));
+  }
   yield* prepareHome(input.home);
   const env = {
     ...hostEnvironment,