diff --git a/src/tasks/task-registry.paths.test.ts b/src/tasks/task-registry.paths.test.ts
new file mode 100644
index 00000000000..0aa97f3b0a7
--- /dev/null
+++ b/src/tasks/task-registry.paths.test.ts
@@ -0,0 +1,25 @@
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import { resolveTaskStateDir } from "./task-registry.paths.js";
+
+describe("task registry paths", () => {
+  it("uses the Vitest worker id to shard test state dirs", () => {
+    expect(
+      resolveTaskStateDir({
+        VITEST: "true",
+        VITEST_POOL_ID: "7",
+      } as NodeJS.ProcessEnv),
+    ).toBe(path.join(os.tmpdir(), "openclaw-test-state", `${process.pid}-7`));
+  });
+
+  it("prefers explicit state dir overrides over Vitest sharding", () => {
+    expect(
+      resolveTaskStateDir({
+        OPENCLAW_STATE_DIR: "/tmp/openclaw-custom-state",
+        VITEST: "true",
+        VITEST_POOL_ID: "7",
+      } as NodeJS.ProcessEnv),
+    ).toBe("/tmp/openclaw-custom-state");
+  });
+});
diff --git a/src/tasks/task-registry.paths.ts b/src/tasks/task-registry.paths.ts
index 35488f76b54..cb56130b89e 100644
--- a/src/tasks/task-registry.paths.ts
+++ b/src/tasks/task-registry.paths.ts
@@ -1,5 +1,6 @@
 import os from "node:os";
 import path from "node:path";
+import { isMainThread, threadId } from "node:worker_threads";
 import { resolveStateDir } from "../config/paths.js";
 
 export function resolveTaskStateDir(env: NodeJS.ProcessEnv = process.env): string {
@@ -8,7 +9,14 @@ export function resolveTaskStateDir(env: NodeJS.ProcessEnv = process.env): strin
     return resolveStateDir(env);
   }
   if (env.VITEST || env.NODE_ENV === "test") {
-    return path.join(os.tmpdir(), "openclaw-test-state", String(process.pid));
+    const workerIdRaw = env.VITEST_WORKER_ID ?? env.VITEST_POOL_ID ?? "";
+    const workerId = Number.parseInt(workerIdRaw, 10);
+    const shardSuffix = Number.isFinite(workerId)
+      ? `${process.pid}-${workerId}`
+      : isMainThread
+        ? String(process.pid)
+        : `${process.pid}-${threadId}`;
+    return path.join(os.tmpdir(), "openclaw-test-state", shardSuffix);
   }
   return resolveStateDir(env);
 }