diff --git a/extensions/device-pair/index.ts b/extensions/device-pair/index.ts
index eccfa8dc8ee..21bbdef8bac 100644
--- a/extensions/device-pair/index.ts
+++ b/extensions/device-pair/index.ts
@@ -1,6 +1,7 @@
 import { mkdtemp, rm, writeFile } from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
+import { normalizeOptionalString } from "openclaw/plugin-sdk/text-runtime";
 import {
   clearDeviceBootstrapTokens,
   definePluginEntry,
@@ -139,7 +140,7 @@ const QR_CHANNEL_SENDERS: Record<string, QrChannelSender> = {
 };
 
 function normalizeUrl(raw: string, schemeFallback: "ws" | "wss"): string | null {
-  const candidate = raw.trim();
+  const candidate = normalizeOptionalString(raw);
   if (!candidate) {
     return null;
   }
@@ -147,7 +148,7 @@ function normalizeUrl(raw: string, schemeFallback: "ws" | "wss"): string | null
   if (parsedUrl) {
     return parsedUrl;
   }
-  const hostPort = candidate.split("/", 1)[0]?.trim() ?? "";
+  const hostPort = normalizeOptionalString(candidate.split("/", 1)[0]) ?? "";
   return hostPort ? `${schemeFallback}://${hostPort}` : null;
 }
 
@@ -230,7 +231,7 @@ function pickMatchingIPv4(predicate: (address: string) => boolean): string | nul
       if (!entry || entry.internal || !isIpv4) {
         continue;
       }
-      const address = entry.address?.trim() ?? "";
+      const address = normalizeOptionalString(entry.address) ?? "";
       if (!address) {
         continue;
       }
@@ -281,10 +282,7 @@ function resolveAuthLabel(cfg: OpenClawPluginApi["config"]): ResolveAuthLabelRes
 
 function pickFirstDefined(candidates: Array<unknown>): string | null {
   for (const value of candidates) {
-    if (typeof value !== "string") {
-      continue;
-    }
-    const trimmed = value.trim();
+    const trimmed = normalizeOptionalString(value);
     if (trimmed) {
       return trimmed;
     }
@@ -312,8 +310,9 @@ async function resolveGatewayUrl(api: OpenClawPluginApi): Promise<ResolveUrlResu
   const scheme = resolveScheme(cfg);
   const port = resolveGatewayPort(cfg);
 
-  if (typeof pluginCfg.publicUrl === "string" && pluginCfg.publicUrl.trim()) {
-    const url = normalizeUrl(pluginCfg.publicUrl, scheme);
+  const configuredPublicUrl = normalizeOptionalString(pluginCfg.publicUrl);
+  if (configuredPublicUrl) {
+    const url = normalizeUrl(configuredPublicUrl, scheme);
     if (url) {
       return { url, source: "plugins.entries.device-pair.config.publicUrl" };
     }
@@ -329,8 +328,8 @@ async function resolveGatewayUrl(api: OpenClawPluginApi): Promise<ResolveUrlResu
     return { url: `wss://${host}`, source: `gateway.tailscale.mode=${tailscaleMode}` };
   }
 
-  const remoteUrl = cfg.gateway?.remote?.url;
-  if (typeof remoteUrl === "string" && remoteUrl.trim()) {
+  const remoteUrl = normalizeOptionalString(cfg.gateway?.remote?.url);
+  if (remoteUrl) {
     const url = normalizeUrl(remoteUrl, scheme);
     if (url) {
       return { url, source: "gateway.remote.url" };
@@ -478,14 +477,19 @@ function canSendQrPngToChannel(channel: string): boolean {
 
 function resolveQrReplyTarget(ctx: QrCommandContext): string {
   if (ctx.channel === "discord") {
-    const senderId = ctx.senderId?.trim() ?? "";
+    const senderId = normalizeOptionalString(ctx.senderId) ?? "";
     if (senderId) {
       return senderId.startsWith("user:") || senderId.startsWith("channel:")
         ? senderId
         : `user:${senderId}`;
     }
   }
-  return ctx.senderId?.trim() || ctx.from?.trim() || ctx.to?.trim() || "";
+  return (
+    normalizeOptionalString(ctx.senderId) ||
+    normalizeOptionalString(ctx.from) ||
+    normalizeOptionalString(ctx.to) ||
+    ""
+  );
 }
 
 const PAIR_SETUP_NON_ISSUING_ACTIONS = new Set([
@@ -521,7 +525,7 @@ async function sendQrPngToSupportedChannel(params: {
   qrFilePath: string;
 }): Promise<boolean> {
   const mediaLocalRoots = [path.dirname(params.qrFilePath)];
-  const accountId = params.ctx.accountId?.trim() || undefined;
+  const accountId = normalizeOptionalString(params.ctx.accountId) || undefined;
   const sender = QR_CHANNEL_SENDERS[params.ctx.channel];
   if (!sender) {
     return false;
@@ -557,7 +561,7 @@ export default definePluginEntry({
       description: "Generate setup codes and approve device pairing requests.",
       acceptsArgs: true,
       handler: async (ctx) => {
-        const args = ctx.args?.trim() ?? "";
+        const args = normalizeOptionalString(ctx.args) ?? "";
         const tokens = args.split(/\s+/).filter(Boolean);
         const action = tokens[0]?.toLowerCase() ?? "";
         const gatewayClientScopes = Array.isArray(ctx.gatewayClientScopes)
@@ -579,7 +583,7 @@ export default definePluginEntry({
         }
 
         if (action === "notify") {
-          const notifyAction = tokens[1]?.trim().toLowerCase() ?? "status";
+          const notifyAction = normalizeOptionalString(tokens[1])?.toLowerCase() ?? "status";
           return await handleNotifyCommand({
             api,
             ctx,
@@ -594,7 +598,7 @@ export default definePluginEntry({
           const list = await listDevicePairing();
           const selected = selectPendingApprovalRequest({
             pending: list.pending,
-            requested: tokens[1]?.trim(),
+            requested: normalizeOptionalString(tokens[1]),
           });
           if (selected.reply) {
             return selected.reply;
@@ -744,7 +748,11 @@ export default definePluginEntry({
           };
         }
         const channel = ctx.channel;
-        const target = ctx.senderId?.trim() || ctx.from?.trim() || ctx.to?.trim() || "";
+        const target =
+          normalizeOptionalString(ctx.senderId) ||
+          normalizeOptionalString(ctx.from) ||
+          normalizeOptionalString(ctx.to) ||
+          "";
         const payload = await issueSetupPayload(urlResult.url);
 
         if (channel === "telegram" && target) {
diff --git a/extensions/device-pair/notify.ts b/extensions/device-pair/notify.ts
index eb23565b04f..5c1bc6e3f92 100644
--- a/extensions/device-pair/notify.ts
+++ b/extensions/device-pair/notify.ts
@@ -1,5 +1,6 @@
 import { promises as fs } from "node:fs";
 import path from "node:path";
+import { normalizeOptionalString } from "openclaw/plugin-sdk/text-runtime";
 import type { OpenClawPluginApi } from "./api.js";
 import { listDevicePairing } from "./api.js";
 
@@ -41,7 +42,7 @@ function formatStringList(values?: readonly string[]): string {
 }
 
 function formatRoleList(request: PendingPairingRequest): string {
-  const role = request.role?.trim();
+  const role = normalizeOptionalString(request.role);
   if (role) {
     return role;
   }
@@ -58,9 +59,9 @@ export function formatPendingRequests(pending: PendingPairingRequest[]): string
   }
   const lines: string[] = ["Pending device pairing requests:"];
   for (const req of pending) {
-    const label = req.displayName?.trim() || req.deviceId;
-    const platform = req.platform?.trim();
-    const ip = req.remoteIp?.trim();
+    const label = normalizeOptionalString(req.displayName) || req.deviceId;
+    const platform = normalizeOptionalString(req.platform);
+    const ip = normalizeOptionalString(req.remoteIp);
     const parts = [
       `- ${req.requestId}`,
       label ? `name=${label}` : null,
@@ -92,17 +93,14 @@ function normalizeNotifyState(raw: unknown): NotifyStateFile {
       continue;
     }
     const record = item as Record<string, unknown>;
-    const to = typeof record.to === "string" ? record.to.trim() : "";
+    const to = normalizeOptionalString(record.to) ?? "";
     if (!to) {
       continue;
     }
-    const accountId =
-      typeof record.accountId === "string" && record.accountId.trim()
-        ? record.accountId.trim()
-        : undefined;
+    const accountId = normalizeOptionalString(record.accountId) ?? undefined;
     const messageThreadId =
       typeof record.messageThreadId === "string"
-        ? record.messageThreadId.trim() || undefined
+        ? normalizeOptionalString(record.messageThreadId) || undefined
         : typeof record.messageThreadId === "number" && Number.isFinite(record.messageThreadId)
           ? Math.trunc(record.messageThreadId)
           : undefined;
@@ -122,13 +120,14 @@ function normalizeNotifyState(raw: unknown): NotifyStateFile {
 
   const notifiedRequestIds: Record<string, number> = {};
   for (const [requestId, ts] of Object.entries(notifiedRaw)) {
-    if (!requestId.trim()) {
+    const normalizedRequestId = normalizeOptionalString(requestId);
+    if (!normalizedRequestId) {
       continue;
     }
     if (typeof ts !== "number" || !Number.isFinite(ts) || ts <= 0) {
       continue;
     }
-    notifiedRequestIds[requestId] = Math.trunc(ts);
+    notifiedRequestIds[normalizedRequestId] = Math.trunc(ts);
   }
 
   return { subscribers, notifiedRequestIds };
@@ -170,7 +169,11 @@ function resolveNotifyTarget(ctx: {
   accountId?: string;
   messageThreadId?: string | number;
 }): NotifyTarget | null {
-  const to = ctx.senderId?.trim() || ctx.from?.trim() || ctx.to?.trim() || "";
+  const to =
+    normalizeOptionalString(ctx.senderId) ||
+    normalizeOptionalString(ctx.from) ||
+    normalizeOptionalString(ctx.to) ||
+    "";
   if (!to) {
     return null;
   }
@@ -206,9 +209,9 @@ function upsertNotifySubscriber(
 }
 
 function buildPairingRequestNotificationText(request: PendingPairingRequest): string {
-  const label = request.displayName?.trim() || request.deviceId;
-  const platform = request.platform?.trim();
-  const ip = request.remoteIp?.trim();
+  const label = normalizeOptionalString(request.displayName) || request.deviceId;
+  const platform = normalizeOptionalString(request.platform);
+  const ip = normalizeOptionalString(request.remoteIp);
   const role = formatRoleList(request);
   const scopes = formatScopeList(request);
   const lines = [
diff --git a/extensions/device-pair/pair-command-approve.ts b/extensions/device-pair/pair-command-approve.ts
index e703a75a032..e68b86e066b 100644
--- a/extensions/device-pair/pair-command-approve.ts
+++ b/extensions/device-pair/pair-command-approve.ts
@@ -1,3 +1,4 @@
+import { normalizeOptionalString } from "openclaw/plugin-sdk/text-runtime";
 import { approveDevicePairing, listDevicePairing } from "./api.js";
 import { formatPendingRequests } from "./notify.js";
 
@@ -43,8 +44,8 @@ export function selectPendingApprovalRequest(params: {
 }
 
 function formatApprovedPairingReply(approved: ApprovedPairingEntry): { text: string } {
-  const label = approved.device.displayName?.trim() || approved.device.deviceId;
-  const platform = approved.device.platform?.trim();
+  const label = normalizeOptionalString(approved.device.displayName) || approved.device.deviceId;
+  const platform = normalizeOptionalString(approved.device.platform);
   const platformLabel = platform ? ` (${platform})` : "";
   return { text: `✅ Paired ${label}${platformLabel}.` };
 }