diff --git a/extensions/active-memory/index.ts b/extensions/active-memory/index.ts
index 6dc64794db1..6c1dc171b53 100644
--- a/extensions/active-memory/index.ts
+++ b/extensions/active-memory/index.ts
@@ -495,7 +495,7 @@ function normalizePluginConfig(pluginConfig: unknown): ResolvedActiveRecallPlugi
   return {
     enabled: raw.enabled !== false,
     agents: Array.isArray(raw.agents)
-      ? raw.agents.map((agentId) => String(agentId).trim()).filter(Boolean)
+      ? raw.agents.map((agentId) => agentId.trim()).filter(Boolean)
       : [],
     model: typeof raw.model === "string" && raw.model.trim() ? raw.model.trim() : undefined,
     modelFallbackPolicy:
diff --git a/extensions/browser/src/browser/server.control-server.test-harness.ts b/extensions/browser/src/browser/server.control-server.test-harness.ts
index b2b3fc3d8a6..5f02544f816 100644
--- a/extensions/browser/src/browser/server.control-server.test-harness.ts
+++ b/extensions/browser/src/browser/server.control-server.test-harness.ts
@@ -575,7 +575,7 @@ export function installBrowserControlServerHooks() {
     vi.stubGlobal(
       "fetch",
       vi.fn(async (url: string, init?: RequestInit) => {
-        const u = String(url);
+        const u = url;
         if (u.includes("/json/list")) {
           if (!state.reachable) {
             return makeResponse([]);
diff --git a/extensions/browser/src/browser/server.post-tabs-open-profile-unknown-returns-404.test.ts b/extensions/browser/src/browser/server.post-tabs-open-profile-unknown-returns-404.test.ts
index 6370e691aaa..590eb13d623 100644
--- a/extensions/browser/src/browser/server.post-tabs-open-profile-unknown-returns-404.test.ts
+++ b/extensions/browser/src/browser/server.post-tabs-open-profile-unknown-returns-404.test.ts
@@ -53,7 +53,7 @@ describe("profile CRUD endpoints", () => {
     vi.stubGlobal(
       "fetch",
       vi.fn(async (url: string) => {
-        const u = String(url);
+        const u = url;
         if (u.includes("/json/list")) {
           return makeResponse([]);
         }
diff --git a/extensions/codex/src/commands.test.ts b/extensions/codex/src/commands.test.ts
index e792b2882c8..11bbfb5592a 100644
--- a/extensions/codex/src/commands.test.ts
+++ b/extensions/codex/src/commands.test.ts
@@ -61,7 +61,7 @@ describe("codex command", () => {
     const deps = createDeps({
       codexControlRequest: vi.fn(
         async (_pluginConfig: unknown, method: string, requestParams: unknown) => {
-          requests.push({ method: String(method), params: requestParams });
+          requests.push({ method, params: requestParams });
           return {
             thread: { id: "thread-123", cwd: "/repo" },
             model: "gpt-5.4",
diff --git a/extensions/google/oauth.test.ts b/extensions/google/oauth.test.ts
index 7fe488db862..825122666f7 100644
--- a/extensions/google/oauth.test.ts
+++ b/extensions/google/oauth.test.ts
@@ -262,13 +262,13 @@ describe("extractGeminiCliCredentials", () => {
     });
     mockRealpathSync.mockReturnValue(resolvedPath);
     mockReaddirSync.mockImplementation((p: string) => {
-      if (normalizePath(String(p)) === normalizePath(bundleDir)) {
+      if (normalizePath(p) === normalizePath(bundleDir)) {
         return [dirent("chunk-ABC123.js", false)];
       }
       return [];
     });
     mockReadFileSync.mockImplementation((p: string) => {
-      if (normalizePath(String(p)) === normalizePath(chunkPath)) {
+      if (normalizePath(p) === normalizePath(chunkPath)) {
         return params.bundleContent;
       }
       throw new Error(`Unexpected read for ${p}`);
diff --git a/extensions/memory-core/src/memory/qmd-manager.test.ts b/extensions/memory-core/src/memory/qmd-manager.test.ts
index 3054b11bdbe..4cdae40971f 100644
--- a/extensions/memory-core/src/memory/qmd-manager.test.ts
+++ b/extensions/memory-core/src/memory/qmd-manager.test.ts
@@ -2925,7 +2925,7 @@ describe("QmdMemoryManager", () => {
               return [
                 {
                   collection: "sessions-main",
-                  path: `${String(arg)}.md`,
+                  path: `${arg}.md`,
                 },
               ];
             default:
diff --git a/extensions/minimax/index.test.ts b/extensions/minimax/index.test.ts
index 786e2b8323c..16620564b28 100644
--- a/extensions/minimax/index.test.ts
+++ b/extensions/minimax/index.test.ts
@@ -92,7 +92,7 @@ describe("minimax provider hooks", () => {
 
     let resolvedApiModelId = "";
     const captureApiModel: StreamFn = (model) => {
-      resolvedApiModelId = String(model.id ?? "");
+      resolvedApiModelId = model.id ?? "";
       return {} as ReturnType<StreamFn>;
     };
     const wrappedApiStream = apiProvider.wrapStreamFn?.({
@@ -114,7 +114,7 @@ describe("minimax provider hooks", () => {
 
     let resolvedPortalModelId = "";
     const capturePortalModel: StreamFn = (model) => {
-      resolvedPortalModelId = String(model.id ?? "");
+      resolvedPortalModelId = model.id ?? "";
       return {} as ReturnType<StreamFn>;
     };
     const wrappedPortalStream = portalProvider.wrapStreamFn?.({
diff --git a/extensions/msteams/src/attachments.graph.test.ts b/extensions/msteams/src/attachments.graph.test.ts
index 1792de9d60a..20ffee21497 100644
--- a/extensions/msteams/src/attachments.graph.test.ts
+++ b/extensions/msteams/src/attachments.graph.test.ts
@@ -326,7 +326,7 @@ describe("msteams graph attachments", () => {
     );
 
     expectAttachmentMediaLength(media.media, 0);
-    const calledUrls = fetchMock.mock.calls.map((call) => String(call[0]));
+    const calledUrls = fetchMock.mock.calls.map((call) => call[0]);
     expect(calledUrls.some((url) => url.startsWith(GRAPH_SHARES_URL_PREFIX))).toBe(true);
     expect(calledUrls).not.toContain(escapedUrl);
   });
diff --git a/extensions/msteams/src/attachments.test.ts b/extensions/msteams/src/attachments.test.ts
index 7ee9fa399c8..6784bd31d48 100644
--- a/extensions/msteams/src/attachments.test.ts
+++ b/extensions/msteams/src/attachments.test.ts
@@ -445,7 +445,7 @@ describe("msteams attachments", () => {
 
       expectAttachmentMediaLength(media, 1);
       expect(tokenProvider.getAccessToken).toHaveBeenCalledOnce();
-      expect(fetchMock.mock.calls.map(([calledUrl]) => String(calledUrl))).toContain(redirectedUrl);
+      expect(fetchMock.mock.calls.map(([calledUrl]) => calledUrl)).toContain(redirectedUrl);
     });
 
     it("continues scope fallback after non-auth failure and succeeds on later scope", async () => {
diff --git a/extensions/openai/openai.live.test.ts b/extensions/openai/openai.live.test.ts
index 2a4509027cc..a04495b71ad 100644
--- a/extensions/openai/openai.live.test.ts
+++ b/extensions/openai/openai.live.test.ts
@@ -240,7 +240,7 @@ describeLive("openai plugin live", () => {
       timeoutMs: 30_000,
     });
 
-    const text = String(transcription?.text ?? "").toLowerCase();
+    const text = (transcription?.text ?? "").toLowerCase();
     expect(text.length).toBeGreaterThan(0);
     expect(text).toContain("openclaw");
     expect(text).toMatch(/\bok\b/);
@@ -330,7 +330,7 @@ describeLive("openai plugin live", () => {
         provider: "openai",
       });
 
-      expect(String(description?.text ?? "").toLowerCase()).toContain("orange");
+      expect((description?.text ?? "").toLowerCase()).toContain("orange");
     } finally {
       await fs.rm(agentDir, { recursive: true, force: true });
     }
diff --git a/extensions/qa-channel/src/channel.test.ts b/extensions/qa-channel/src/channel.test.ts
index 8b399143936..48be4e6d1ba 100644
--- a/extensions/qa-channel/src/channel.test.ts
+++ b/extensions/qa-channel/src/channel.test.ts
@@ -58,7 +58,7 @@ function createMockQaRuntime(): PluginRuntime {
           dispatcherOptions: { deliver: (payload: { text: string }) => Promise<void> };
         }) {
           await dispatcherOptions.deliver({
-            text: `qa-echo: ${String(ctx.BodyForAgent ?? ctx.Body ?? "")}`,
+            text: `qa-echo: ${ctx.BodyForAgent ?? ctx.Body ?? ""}`,
           });
         },
       },
diff --git a/extensions/slack/src/monitor.tool-result.test.ts b/extensions/slack/src/monitor.tool-result.test.ts
index 68fbc6ba774..0258c864802 100644
--- a/extensions/slack/src/monitor.tool-result.test.ts
+++ b/extensions/slack/src/monitor.tool-result.test.ts
@@ -268,9 +268,7 @@ describe("monitorSlackProvider tool results", () => {
   }
 
   function expectReactionNames(names: string[]) {
-    expect(reactMock.mock.calls.map(([args]) => String((args as { name: string }).name))).toEqual(
-      names,
-    );
+    expect(reactMock.mock.calls.map(([args]) => (args as { name: string }).name)).toEqual(names);
   }
 
   async function runDefaultMessageAndExpectSentText(expectedText: string) {
diff --git a/extensions/telegram/src/bot-message-dispatch.test.ts b/extensions/telegram/src/bot-message-dispatch.test.ts
index e9e863d3ce5..d34bc8dede7 100644
--- a/extensions/telegram/src/bot-message-dispatch.test.ts
+++ b/extensions/telegram/src/bot-message-dispatch.test.ts
@@ -1991,7 +1991,7 @@ describe("dispatchTelegramMessage draft streaming", () => {
     );
     expect(answerDraftStream.update).toHaveBeenCalledWith("3");
     expect(
-      answerDraftStream.update.mock.calls.some((call) => String(call[0] ?? "").includes("<think>")),
+      answerDraftStream.update.mock.calls.some((call) => (call[0] ?? "").includes("<think>")),
     ).toBe(false);
     expect(editMessageTelegram).toHaveBeenCalledWith(123, 999, "3", expect.any(Object));
   });
@@ -2021,9 +2021,9 @@ describe("dispatchTelegramMessage draft streaming", () => {
     expect(reasoningDraftStream.update).toHaveBeenCalledWith(
       "Reasoning:\n_Counting letters in strawberry_",
     );
-    expect(
-      answerDraftStream.update.mock.calls.some((call) => String(call[0] ?? "").includes("<")),
-    ).toBe(false);
+    expect(answerDraftStream.update.mock.calls.some((call) => (call[0] ?? "").includes("<"))).toBe(
+      false,
+    );
     expect(editMessageTelegram).toHaveBeenCalledWith(
       123,
       999,
diff --git a/extensions/thread-ownership/index.ts b/extensions/thread-ownership/index.ts
index 28fd39ecab1..59a70d7498e 100644
--- a/extensions/thread-ownership/index.ts
+++ b/extensions/thread-ownership/index.ts
@@ -31,8 +31,8 @@ function cleanExpiredMentions(): void {
 
 function resolveOwnershipAgent(config: OpenClawConfig): { id: string; name: string } {
   const list = Array.isArray(config.agents?.list)
-    ? config.agents.list.filter((entry): entry is AgentEntry =>
-        Boolean(entry && typeof entry === "object"),
+    ? config.agents.list.filter(
+        (entry): entry is AgentEntry => entry !== null && typeof entry === "object",
       )
     : [];
   const selected = list.find((entry) => entry.default === true) ?? list[0];
diff --git a/extensions/voice-call/src/webhook-security.test.ts b/extensions/voice-call/src/webhook-security.test.ts
index c818bfa7903..e85c27a2b55 100644
--- a/extensions/voice-call/src/webhook-security.test.ts
+++ b/extensions/voice-call/src/webhook-security.test.ts
@@ -369,7 +369,7 @@ describe("verifyPlivoWebhook", () => {
 describe("verifyTelnyxWebhook", () => {
   it("marks replayed valid requests as replay without failing auth", () => {
     const { publicKey, privateKey } = crypto.generateKeyPairSync("ed25519");
-    const pemPublicKey = publicKey.export({ format: "pem", type: "spki" }).toString();
+    const pemPublicKey = publicKey.export({ format: "pem", type: "spki" });
     const timestamp = String(Math.floor(Date.now() / 1000));
     const rawBody = JSON.stringify({
       data: { event_type: "call.initiated", payload: { call_control_id: "call-1" } },
@@ -395,7 +395,7 @@ describe("verifyTelnyxWebhook", () => {
 
   it("treats Base64 and Base64URL signatures as the same replayed request", () => {
     const { publicKey, privateKey } = crypto.generateKeyPairSync("ed25519");
-    const pemPublicKey = publicKey.export({ format: "pem", type: "spki" }).toString();
+    const pemPublicKey = publicKey.export({ format: "pem", type: "spki" });
     const timestamp = String(Math.floor(Date.now() / 1000));
     const rawBody = JSON.stringify({
       data: { event_type: "call.initiated", payload: { call_control_id: "call-1" } },
diff --git a/extensions/whatsapp/src/monitor-inbox.test-harness.ts b/extensions/whatsapp/src/monitor-inbox.test-harness.ts
index e2d9e4f67e5..71da4cb41c7 100644
--- a/extensions/whatsapp/src/monitor-inbox.test-harness.ts
+++ b/extensions/whatsapp/src/monitor-inbox.test-harness.ts
@@ -202,14 +202,11 @@ export function expectPairingPromptSent(sock: MockSock, jid: string, senderE164:
   expect(sock.sendMessage).toHaveBeenCalledTimes(1);
   const sendCall = sock.sendMessage.mock.calls[0];
   expect(sendCall?.[0]).toBe(jid);
-  expectInboxPairingReplyText(
-    String((sendCall?.[1] as { text?: string } | undefined)?.text ?? ""),
-    {
-      channel: "whatsapp",
-      idLine: `Your WhatsApp phone number: ${senderE164}`,
-      code: "PAIRCODE",
-    },
-  );
+  expectInboxPairingReplyText((sendCall?.[1] as { text?: string } | undefined)?.text ?? "", {
+    channel: "whatsapp",
+    idLine: `Your WhatsApp phone number: ${senderE164}`,
+    code: "PAIRCODE",
+  });
 }
 
 let authDir: string | undefined;
diff --git a/extensions/whatsapp/src/test-helpers.ts b/extensions/whatsapp/src/test-helpers.ts
index 53457e80a95..dd014295d5a 100644
--- a/extensions/whatsapp/src/test-helpers.ts
+++ b/extensions/whatsapp/src/test-helpers.ts
@@ -319,7 +319,7 @@ vi.mock("./auto-reply/monitor/runtime-api.js", () => ({
   },
   logVerbose: (_msg: string) => undefined,
   normalizeE164: (value: string) => {
-    const digits = String(value).replace(/\D+/g, "");
+    const digits = value.replace(/\D+/g, "");
     return digits ? `+${digits}` : null;
   },
   readStoreAllowFromForDmPolicy: async () => [] as string[],
@@ -363,7 +363,7 @@ vi.mock("./auto-reply/monitor/group-gating.runtime.js", () => ({
   hasControlCommand: (body: string) => body.trim().startsWith("/"),
   implicitMentionKindWhen: (kind: string, enabled: boolean) => (enabled ? [kind] : []),
   normalizeE164: (value: string) => {
-    const digits = String(value).replace(/\D+/g, "");
+    const digits = value.replace(/\D+/g, "");
     return digits ? `+${digits}` : null;
   },
   parseActivationCommand: (body: string) => ({
diff --git a/extensions/xai/index.test.ts b/extensions/xai/index.test.ts
index 8a8d4570148..c4e61fc112c 100644
--- a/extensions/xai/index.test.ts
+++ b/extensions/xai/index.test.ts
@@ -42,7 +42,7 @@ describe("xai provider plugin", () => {
     let capturedModelId = "";
     let capturedPayload: Record<string, unknown> | undefined;
     const baseStreamFn: StreamFn = (model, _context, options) => {
-      capturedModelId = String(model.id);
+      capturedModelId = model.id;
       const payload: Record<string, unknown> = {
         reasoning: { effort: "high" },
         tools: [
diff --git a/extensions/xai/stream.test.ts b/extensions/xai/stream.test.ts
index cf14b6ed1a8..8d19965ece8 100644
--- a/extensions/xai/stream.test.ts
+++ b/extensions/xai/stream.test.ts
@@ -97,7 +97,7 @@ describe("xai stream wrappers", () => {
     let capturedModelId = "";
     let capturedPayload: XaiTestPayload | undefined;
     const baseStreamFn: StreamFn = (model, _context, options) => {
-      capturedModelId = String(model.id);
+      capturedModelId = model.id;
       const payload: XaiTestPayload = {
         reasoning: { effort: "high" },
         tools: [