diff --git a/src/auto-reply/reply/session-resets.test.ts b/src/auto-reply/reply/session-resets.test.ts
index 3c4810388..16c44172f 100644
--- a/src/auto-reply/reply/session-resets.test.ts
+++ b/src/auto-reply/reply/session-resets.test.ts
@@ -1,7 +1,7 @@
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
-import { describe, expect, it, vi } from "vitest";
+import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
 import type { OpenClawConfig } from "../../config/config.js";
 import { buildModelAliasIndex } from "../../agents/model-selection.js";
 import { formatZonedTimestamp } from "../../infra/format-time/format-datetime.ts";
@@ -17,12 +17,26 @@ vi.mock("../../agents/model-catalog.js", () => ({
   ]),
 }));
 
-describe("initSessionState reset triggers in WhatsApp groups", () => {
-  async function createStorePath(prefix: string): Promise<string> {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
-    return path.join(root, "sessions.json");
-  }
+let suiteRoot = "";
+let suiteCase = 0;
 
+beforeAll(async () => {
+  suiteRoot = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-session-resets-suite-"));
+});
+
+afterAll(async () => {
+  await fs.rm(suiteRoot, { recursive: true, force: true });
+  suiteRoot = "";
+  suiteCase = 0;
+});
+
+async function createStorePath(prefix: string): Promise<string> {
+  const root = path.join(suiteRoot, `${prefix}${++suiteCase}`);
+  await fs.mkdir(root, { recursive: true });
+  return path.join(root, "sessions.json");
+}
+
+describe("initSessionState reset triggers in WhatsApp groups", () => {
   async function seedSessionStore(params: {
     storePath: string;
     sessionKey: string;
@@ -257,11 +271,6 @@ describe("initSessionState reset triggers in WhatsApp groups", () => {
 });
 
 describe("initSessionState reset triggers in Slack channels", () => {
-  async function createStorePath(prefix: string): Promise<string> {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
-    return path.join(root, "sessions.json");
-  }
-
   async function seedSessionStore(params: {
     storePath: string;
     sessionKey: string;
@@ -453,11 +462,6 @@ describe("applyResetModelOverride", () => {
 });
 
 describe("initSessionState preserves behavior overrides across /new and /reset", () => {
-  async function createStorePath(prefix: string): Promise<string> {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
-    return path.join(root, "sessions.json");
-  }
-
   async function seedSessionStoreWithOverrides(params: {
     storePath: string;
     sessionKey: string;
diff --git a/src/auto-reply/reply/session.test.ts b/src/auto-reply/reply/session.test.ts
index 100251cd9..ba239f610 100644
--- a/src/auto-reply/reply/session.test.ts
+++ b/src/auto-reply/reply/session.test.ts
@@ -1,14 +1,33 @@
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
-import { describe, expect, it, vi } from "vitest";
+import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
 import type { OpenClawConfig } from "../../config/config.js";
 import { saveSessionStore } from "../../config/sessions.js";
 import { initSessionState } from "./session.js";
 
+let suiteRoot = "";
+let suiteCase = 0;
+
+beforeAll(async () => {
+  suiteRoot = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-session-suite-"));
+});
+
+afterAll(async () => {
+  await fs.rm(suiteRoot, { recursive: true, force: true });
+  suiteRoot = "";
+  suiteCase = 0;
+});
+
+async function makeCaseDir(prefix: string): Promise<string> {
+  const dir = path.join(suiteRoot, `${prefix}${++suiteCase}`);
+  await fs.mkdir(dir, { recursive: true });
+  return dir;
+}
+
 describe("initSessionState thread forking", () => {
   it("forks a new session from the parent session file", async () => {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-thread-session-"));
+    const root = await makeCaseDir("openclaw-thread-session-");
     const sessionsDir = path.join(root, "sessions");
     await fs.mkdir(sessionsDir, { recursive: true });
 
@@ -80,7 +99,7 @@ describe("initSessionState thread forking", () => {
   });
 
   it("records topic-specific session files when MessageThreadId is present", async () => {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-topic-session-"));
+    const root = await makeCaseDir("openclaw-topic-session-");
     const storePath = path.join(root, "sessions.json");
 
     const cfg = {
@@ -107,7 +126,7 @@ describe("initSessionState thread forking", () => {
 
 describe("initSessionState RawBody", () => {
   it("triggerBodyNormalized correctly extracts commands when Body contains context but RawBody is clean", async () => {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-rawbody-"));
+    const root = await makeCaseDir("openclaw-rawbody-");
     const storePath = path.join(root, "sessions.json");
     const cfg = { session: { store: storePath } } as OpenClawConfig;
 
@@ -128,7 +147,7 @@ describe("initSessionState RawBody", () => {
   });
 
   it("Reset triggers (/new, /reset) work with RawBody", async () => {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-rawbody-reset-"));
+    const root = await makeCaseDir("openclaw-rawbody-reset-");
     const storePath = path.join(root, "sessions.json");
     const cfg = { session: { store: storePath } } as OpenClawConfig;
 
@@ -150,7 +169,7 @@ describe("initSessionState RawBody", () => {
   });
 
   it("preserves argument casing while still matching reset triggers case-insensitively", async () => {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-rawbody-reset-case-"));
+    const root = await makeCaseDir("openclaw-rawbody-reset-case-");
     const storePath = path.join(root, "sessions.json");
 
     const cfg = {
@@ -178,7 +197,7 @@ describe("initSessionState RawBody", () => {
   });
 
   it("falls back to Body when RawBody is undefined", async () => {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-rawbody-fallback-"));
+    const root = await makeCaseDir("openclaw-rawbody-fallback-");
     const storePath = path.join(root, "sessions.json");
     const cfg = { session: { store: storePath } } as OpenClawConfig;
 
@@ -197,7 +216,7 @@ describe("initSessionState RawBody", () => {
   });
 
   it("uses the default per-agent sessions store when config store is unset", async () => {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-session-store-default-"));
+    const root = await makeCaseDir("openclaw-session-store-default-");
     const stateDir = path.join(root, ".openclaw");
     const agentId = "worker1";
     const sessionKey = `agent:${agentId}:telegram:12345`;
@@ -243,7 +262,7 @@ describe("initSessionState reset policy", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date(2026, 0, 18, 5, 0, 0));
     try {
-      const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-reset-daily-"));
+      const root = await makeCaseDir("openclaw-reset-daily-");
       const storePath = path.join(root, "sessions.json");
       const sessionKey = "agent:main:whatsapp:dm:s1";
       const existingSessionId = "daily-session-id";
@@ -273,7 +292,7 @@ describe("initSessionState reset policy", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date(2026, 0, 18, 3, 0, 0));
     try {
-      const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-reset-daily-edge-"));
+      const root = await makeCaseDir("openclaw-reset-daily-edge-");
       const storePath = path.join(root, "sessions.json");
       const sessionKey = "agent:main:whatsapp:dm:s-edge";
       const existingSessionId = "daily-edge-session";
@@ -303,7 +322,7 @@ describe("initSessionState reset policy", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date(2026, 0, 18, 5, 30, 0));
     try {
-      const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-reset-idle-"));
+      const root = await makeCaseDir("openclaw-reset-idle-");
       const storePath = path.join(root, "sessions.json");
       const sessionKey = "agent:main:whatsapp:dm:s2";
       const existingSessionId = "idle-session-id";
@@ -338,7 +357,7 @@ describe("initSessionState reset policy", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date(2026, 0, 18, 5, 0, 0));
     try {
-      const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-reset-thread-"));
+      const root = await makeCaseDir("openclaw-reset-thread-");
       const storePath = path.join(root, "sessions.json");
       const sessionKey = "agent:main:slack:channel:c1:thread:123";
       const existingSessionId = "thread-session-id";
@@ -374,7 +393,7 @@ describe("initSessionState reset policy", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date(2026, 0, 18, 5, 0, 0));
     try {
-      const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-reset-thread-nosuffix-"));
+      const root = await makeCaseDir("openclaw-reset-thread-nosuffix-");
       const storePath = path.join(root, "sessions.json");
       const sessionKey = "agent:main:discord:channel:c1";
       const existingSessionId = "thread-nosuffix";
@@ -409,7 +428,7 @@ describe("initSessionState reset policy", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date(2026, 0, 18, 5, 0, 0));
     try {
-      const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-reset-type-default-"));
+      const root = await makeCaseDir("openclaw-reset-type-default-");
       const storePath = path.join(root, "sessions.json");
       const sessionKey = "agent:main:whatsapp:dm:s4";
       const existingSessionId = "type-default-session";
@@ -444,7 +463,7 @@ describe("initSessionState reset policy", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date(2026, 0, 18, 5, 0, 0));
     try {
-      const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-reset-legacy-"));
+      const root = await makeCaseDir("openclaw-reset-legacy-");
       const storePath = path.join(root, "sessions.json");
       const sessionKey = "agent:main:whatsapp:dm:s3";
       const existingSessionId = "legacy-session-id";
@@ -478,7 +497,7 @@ describe("initSessionState reset policy", () => {
 
 describe("initSessionState channel reset overrides", () => {
   it("uses channel-specific reset policy when configured", async () => {
-    const root = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-channel-idle-"));
+    const root = await makeCaseDir("openclaw-channel-idle-");
     const storePath = path.join(root, "sessions.json");
     const sessionKey = "agent:main:discord:dm:123";
     const sessionId = "session-override";