diff --git a/packages/app/e2e/mobile/terminal-input/hardware-enter.android.mjs b/packages/app/e2e/mobile/terminal-input/hardware-enter.android.mjs
new file mode 100644
index 0000000000..424ca38599
--- /dev/null
+++ b/packages/app/e2e/mobile/terminal-input/hardware-enter.android.mjs
@@ -0,0 +1,78 @@
+// Select a shell terminal in the Android app, loaded from the checkout under test.
+// node packages/app/e2e/mobile/terminal-input/hardware-enter.android.mjs <session> <serial> <daemon-home> <terminal-id>
+// Requires a local daemon, Node.js in the terminal, and agent-device with the real IME.
+import assert from "node:assert/strict";
+import { execFileSync } from "node:child_process";
+import { fileURLToPath } from "node:url";
+import { setTimeout as delay } from "node:timers/promises";
+
+const [, , session, serial, home, terminalId] = process.argv;
+assert(
+  session && serial && home && terminalId,
+  "Pass session, adb serial, daemon home, terminal ID",
+);
+const cli = fileURLToPath(new URL("../../../../cli/dist/index.js", import.meta.url));
+function terminal(...args) {
+  return execFileSync(process.execPath, [cli, "--home", home, "terminal", ...args], {
+    encoding: "utf8",
+    timeout: 10_000,
+  });
+}
+function key(code) {
+  execFileSync("adb", ["-s", serial, "shell", "input", "keyevent", code], { timeout: 10_000 });
+}
+function capture() {
+  return JSON.parse(terminal("capture", terminalId, "--json")).lines.map((line) => line.trim());
+}
+async function waitForLine(line) {
+  const deadline = Date.now() + 10_000;
+  do {
+    if (capture().includes(line)) return;
+    await delay(100);
+  } while (Date.now() < deadline);
+  assert.fail(`Terminal did not produce ${line}`);
+}
+
+// Inspect bytes at the PTY rather than counting prompts, which depend on the shell theme.
+// Keep reading after Enter to catch its key-up event and to check the following character.
+const reader = [
+  "process.stdin.setRawMode(true)",
+  "let hex = ''",
+  "console.log('REA' + 'DY')",
+  "process.stdin.on('data', data => {",
+  "if (data.includes(3)) { process.stdin.setRawMode(false); process.exit(0); }",
+  "hex += data.toString('hex'); console.log('HE' + 'X:' + hex);",
+  "})",
+].join(";");
+const quotedReader = "'" + reader.replaceAll("'", "'\\''") + "'";
+const command = `node -e ${quotedReader}`;
+const failures = [];
+for (const enter of ["KEYCODE_ENTER", "KEYCODE_NUMPAD_ENTER"]) {
+  terminal("send-keys", terminalId, "--literal", command);
+  terminal("send-keys", terminalId, "Enter");
+  try {
+    await waitForLine("READY");
+    execFileSync("agent-device", ["--session", session, "press", 'id="terminal-surface"'], {
+      encoding: "utf8",
+      timeout: 30_000,
+    });
+    key(enter);
+    await waitForLine("HEX:0d");
+    // The second event is native key-up, so allow it to arrive before the assertion.
+    await delay(500);
+    assert(!capture().includes("HEX:0d0d"), `${enter} submitted twice`);
+    key("KEYCODE_X");
+    await waitForLine("HEX:0d78");
+    console.log(`PASS: ${enter} sends one carriage return and preserves the next character`);
+  } catch (error) {
+    failures.push(error);
+    console.error(error.message);
+  } finally {
+    terminal("send-keys", terminalId, "C-c");
+    await delay(300);
+    terminal("send-keys", terminalId, "--literal", "clear");
+    terminal("send-keys", terminalId, "Enter");
+    await delay(300);
+  }
+}
+assert.equal(failures.length, 0, "Hardware Enter regression");