diff --git a/src/openclaw/reply-listener-log.ts b/src/openclaw/reply-listener-log.ts
new file mode 100644
index 000000000..58a536d6c
--- /dev/null
+++ b/src/openclaw/reply-listener-log.ts
@@ -0,0 +1,55 @@
+import {
+  appendFileSync,
+  chmodSync,
+  existsSync,
+  renameSync,
+  statSync,
+  unlinkSync,
+  writeFileSync,
+} from "fs"
+import {
+  ensureReplyListenerStateDir,
+  REPLY_LISTENER_SECURE_FILE_MODE,
+  getReplyListenerLogFilePath,
+} from "./reply-listener-paths"
+
+const MAX_REPLY_LISTENER_LOG_SIZE_BYTES = 1024 * 1024
+
+export function writeSecureReplyListenerFile(filePath: string, content: string): void {
+  ensureReplyListenerStateDir()
+  writeFileSync(filePath, content, { mode: REPLY_LISTENER_SECURE_FILE_MODE })
+
+  try {
+    chmodSync(filePath, REPLY_LISTENER_SECURE_FILE_MODE)
+  } catch {
+  }
+}
+
+function rotateReplyListenerLogIfNeeded(logPath: string): void {
+  try {
+    if (!existsSync(logPath)) return
+
+    const stats = statSync(logPath)
+    if (stats.size <= MAX_REPLY_LISTENER_LOG_SIZE_BYTES) return
+
+    const backupPath = `${logPath}.old`
+    if (existsSync(backupPath)) {
+      unlinkSync(backupPath)
+    }
+    renameSync(logPath, backupPath)
+  } catch {
+  }
+}
+
+export function logReplyListenerMessage(message: string): void {
+  try {
+    ensureReplyListenerStateDir()
+    const logFilePath = getReplyListenerLogFilePath()
+    rotateReplyListenerLogIfNeeded(logFilePath)
+    const timestamp = new Date().toISOString()
+    appendFileSync(logFilePath, `[${timestamp}] ${message}\n`, {
+      mode: REPLY_LISTENER_SECURE_FILE_MODE,
+    })
+  } catch {
+  }
+}
diff --git a/src/openclaw/reply-listener-process.ts b/src/openclaw/reply-listener-process.ts
new file mode 100644
index 000000000..f6309f168
--- /dev/null
+++ b/src/openclaw/reply-listener-process.ts
@@ -0,0 +1,78 @@
+import { readFileSync } from "fs"
+import { spawn } from "bun"
+
+export const REPLY_LISTENER_DAEMON_IDENTITY_MARKER = "--openclaw-reply-listener-daemon"
+
+const REPLY_LISTENER_DAEMON_ENV_ALLOWLIST = [
+  "PATH",
+  "HOME",
+  "USERPROFILE",
+  "USER",
+  "USERNAME",
+  "LOGNAME",
+  "LANG",
+  "LC_ALL",
+  "LC_CTYPE",
+  "TERM",
+  "TMUX",
+  "TMUX_PANE",
+  "TMPDIR",
+  "TMP",
+  "TEMP",
+  "XDG_RUNTIME_DIR",
+  "XDG_DATA_HOME",
+  "XDG_CONFIG_HOME",
+  "SHELL",
+  "NODE_ENV",
+  "HTTP_PROXY",
+  "HTTPS_PROXY",
+  "http_proxy",
+  "https_proxy",
+  "NO_PROXY",
+  "no_proxy",
+  "SystemRoot",
+  "SYSTEMROOT",
+  "windir",
+  "COMSPEC",
+] as const
+
+export function createReplyListenerDaemonEnv(extraEnv: Record<string, string>): Record<string, string> {
+  const env: Record<string, string> = {}
+
+  for (const key of REPLY_LISTENER_DAEMON_ENV_ALLOWLIST) {
+    const value = process.env[key]
+    if (value !== undefined) {
+      env[key] = value
+    }
+  }
+
+  return { ...env, ...extraEnv }
+}
+
+export function isReplyListenerProcessRunning(pid: number): boolean {
+  try {
+    process.kill(pid, 0)
+    return true
+  } catch {
+    return false
+  }
+}
+
+export async function isReplyListenerDaemonProcess(pid: number): Promise<boolean> {
+  try {
+    if (process.platform === "linux") {
+      const cmdline = readFileSync(`/proc/${pid}/cmdline`, "utf-8")
+      return cmdline.includes(REPLY_LISTENER_DAEMON_IDENTITY_MARKER)
+    }
+
+    const processInfo = spawn(["ps", "-p", String(pid), "-o", "args="], {
+      stdout: "pipe",
+      stderr: "ignore",
+    })
+    const stdout = await new Response(processInfo.stdout).text()
+    if (processInfo.exitCode !== 0) return false
+    return stdout.includes(REPLY_LISTENER_DAEMON_IDENTITY_MARKER)
+  } catch {
+    return false
+  }
+}
diff --git a/src/openclaw/reply-listener-spawn.ts b/src/openclaw/reply-listener-spawn.ts
new file mode 100644
index 000000000..1cd0a1818
--- /dev/null
+++ b/src/openclaw/reply-listener-spawn.ts
@@ -0,0 +1,25 @@
+import { spawn } from "bun"
+import {
+  createReplyListenerDaemonEnv,
+  REPLY_LISTENER_DAEMON_IDENTITY_MARKER,
+} from "./reply-listener-process"
+import { REPLY_LISTENER_STARTUP_TOKEN_ENV } from "./reply-listener-state"
+
+export interface ReplyListenerSpawnProcess {
+  pid: number | undefined
+  unref(): void
+}
+
+export function spawnReplyListenerDaemon(
+  daemonScript: string,
+  startupToken: string,
+): ReplyListenerSpawnProcess {
+  return spawn(["bun", "run", daemonScript, REPLY_LISTENER_DAEMON_IDENTITY_MARKER], {
+    detached: true,
+    stdio: ["ignore", "ignore", "ignore"],
+    cwd: process.cwd(),
+    env: createReplyListenerDaemonEnv({
+      [REPLY_LISTENER_STARTUP_TOKEN_ENV]: startupToken,
+    }),
+  })
+}