diff --git a/CHANGELOG.md b/CHANGELOG.md
index 616b5d7e315..c82d27c5e8f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -143,6 +143,7 @@ Docs: https://docs.openclaw.ai
 - Plugins/Install: clear stale install errors when an npm package is not found so follow-up install attempts report current state correctly. (#25073) Thanks @dalefrieswthat.
 - Security/Feishu webhook ingress: bound unauthenticated webhook rate-limit state with stale-window pruning and a hard key cap to prevent unbounded pre-auth memory growth from rotating source keys. (#26050) Thanks @bmendonca3.
 - Gateway/macOS supervised restart: actively `launchctl kickstart -k` during intentional supervised restarts to bypass LaunchAgent `ThrottleInterval` delays, and fall back to in-process restart when kickstart fails. Landed from contributor PR #29078 by @cathrynlavery. Thanks @cathrynlavery.
+- Gateway/macOS LaunchAgent hardening: write `Umask=077` in generated gateway LaunchAgent plists so npm upgrades preserve owner-only default file permissions for gateway-created state files. (#31919) Fixes #31905. Thanks @liuxiaopai-ai.
 - Daemon/macOS TLS certs: default LaunchAgent service env `NODE_EXTRA_CA_CERTS` to `/etc/ssl/cert.pem` (while preserving explicit overrides) so HTTPS clients no longer fail with local-issuer errors under launchd. (#27915) Thanks @Lukavyi.
 - Discord/Components wildcard handlers: use distinct internal registration sentinel IDs and parse those sentinels as wildcard keys so select/user/role/channel/mentionable/modal interactions are not dropped by raw customId dedupe paths. Landed from contributor PR #29459 by @Sid-Qin. Thanks @Sid-Qin.
 - Feishu/Reaction notifications: add `channels.feishu.reactionNotifications` (`off | own | all`, default `own`) so operators can disable reaction ingress or allow all verified reaction events (not only bot-authored message reactions). (#28529) Thanks @cowboy129.
diff --git a/src/daemon/launchd-plist.ts b/src/daemon/launchd-plist.ts
index 37448cdcebf..8cca6d6d8e0 100644
--- a/src/daemon/launchd-plist.ts
+++ b/src/daemon/launchd-plist.ts
@@ -4,6 +4,7 @@ import fs from "node:fs/promises";
 // intentional gateway restarts. Keep it low so CLI restarts and forced
 // reinstalls do not stall for a full minute.
 export const LAUNCH_AGENT_THROTTLE_INTERVAL_SECONDS = 1;
+export const LAUNCH_AGENT_UMASK_DECIMAL = 0o077;
 
 const plistEscape = (value: string): string =>
   value
@@ -111,5 +112,5 @@ export function buildLaunchAgentPlist({
     ? `\n    <key>Comment</key>\n    <string>${plistEscape(comment.trim())}</string>`
     : "";
   const envXml = renderEnvDict(environment);
-  return `<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">\n<plist version="1.0">\n  <dict>\n    <key>Label</key>\n    <string>${plistEscape(label)}</string>\n    ${commentXml}\n    <key>RunAtLoad</key>\n    <true/>\n    <key>KeepAlive</key>\n    <true/>\n    <key>ThrottleInterval</key>\n    <integer>${LAUNCH_AGENT_THROTTLE_INTERVAL_SECONDS}</integer>\n    <key>ProgramArguments</key>\n    <array>${argsXml}\n    </array>\n    ${workingDirXml}\n    <key>StandardOutPath</key>\n    <string>${plistEscape(stdoutPath)}</string>\n    <key>StandardErrorPath</key>\n    <string>${plistEscape(stderrPath)}</string>${envXml}\n  </dict>\n</plist>\n`;
+  return `<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">\n<plist version="1.0">\n  <dict>\n    <key>Label</key>\n    <string>${plistEscape(label)}</string>\n    ${commentXml}\n    <key>RunAtLoad</key>\n    <true/>\n    <key>KeepAlive</key>\n    <true/>\n    <key>ThrottleInterval</key>\n    <integer>${LAUNCH_AGENT_THROTTLE_INTERVAL_SECONDS}</integer>\n    <key>Umask</key>\n    <integer>${LAUNCH_AGENT_UMASK_DECIMAL}</integer>\n    <key>ProgramArguments</key>\n    <array>${argsXml}\n    </array>\n    ${workingDirXml}\n    <key>StandardOutPath</key>\n    <string>${plistEscape(stdoutPath)}</string>\n    <key>StandardErrorPath</key>\n    <string>${plistEscape(stderrPath)}</string>${envXml}\n  </dict>\n</plist>\n`;
 }
diff --git a/src/daemon/launchd.test.ts b/src/daemon/launchd.test.ts
index 6cf31dc5ce5..0266038d0b9 100644
--- a/src/daemon/launchd.test.ts
+++ b/src/daemon/launchd.test.ts
@@ -1,6 +1,9 @@
 import { PassThrough } from "node:stream";
 import { beforeEach, describe, expect, it, vi } from "vitest";
-import { LAUNCH_AGENT_THROTTLE_INTERVAL_SECONDS } from "./launchd-plist.js";
+import {
+  LAUNCH_AGENT_THROTTLE_INTERVAL_SECONDS,
+  LAUNCH_AGENT_UMASK_DECIMAL,
+} from "./launchd-plist.js";
 import {
   installLaunchAgent,
   isLaunchAgentListed,
@@ -201,6 +204,8 @@ describe("launchd install", () => {
     expect(plist).not.toContain("<key>SuccessfulExit</key>");
     expect(plist).toContain("<key>ThrottleInterval</key>");
     expect(plist).toContain(`<integer>${LAUNCH_AGENT_THROTTLE_INTERVAL_SECONDS}</integer>`);
+    expect(plist).toContain("<key>Umask</key>");
+    expect(plist).toContain(`<integer>${LAUNCH_AGENT_UMASK_DECIMAL}</integer>`);
   });
 
   it("restarts LaunchAgent with bootout-bootstrap-kickstart order", async () => {