diff --git a/docs-site/src/content/docs/ko/reference/cli/lifecycle.md b/docs-site/src/content/docs/ko/reference/cli/lifecycle.md
index 59e26108466..493df5501b2 100644
--- a/docs-site/src/content/docs/ko/reference/cli/lifecycle.md
+++ b/docs-site/src/content/docs/ko/reference/cli/lifecycle.md
@@ -355,6 +355,8 @@ Windows에서 Task Scheduler 항목을 만들려면 권한 상승이 필요합
 
 시작할 때 `another process owns the runtime mutation lease`가 보고되거나 `ocx service status`에 `Runtime mutation lease busy`가 표시되면, 프록시가 실행 중이 아니더라도 이 리스가 시작이나 서비스 변경을 막고 있는 것입니다. 메시지에는 잠금 경로, 기록된 PID, 그 PID가 현재 살아 있는지 여부, 확인할 수 있는 경우 실행 파일 이름, 리스 경과 시간이 들어 있습니다. 프로세스의 신원은 검증되지 않습니다. PID가 재사용되었을 수 있으므로, 생존 여부와 실행 파일 이름은 지금 그 PID를 쓰고 있는 프로세스에 대한 정보입니다. 작업이 끝날 때까지 기다린 뒤 다시 시도하세요. 이 PID만 보고 잠금을 삭제하거나 프로세스를 중지하지 마세요. 리스 경과 시간이 30초를 넘고 기록된 PID가 더 이상 살아 있지 않으면 이후의 변경 시도가 오래된 리스를 회수할 수 있습니다. `ocx service status`는 리스를 확인만 합니다.
 
+Windows에서는 이 공용 Node/Bun 진단 경로가 실행 파일 이름 조회용 프로그램을 실행하지 않습니다. 기록된 PID, 생존 여부, 리스 경과 시간과 복구 안내는 계속 표시됩니다.
+
 ### `ocx codex-shim <install|status|uninstall|remove>`
 
 macOS와 Linux에서 `ocx codex-shim install`은 확정된 OpenCodex 홈에 전용 wrapper `<OPENCODEX_HOME>/bin/codex`와 셸에서 읽을 `<OPENCODEX_HOME>/codex-shell-env.sh`를 설치합니다. 원래 런처는 brew, npm, fnm이 설치한 위치에 그대로 있어 패키지 관리자 업데이트와 버전 롤백 뒤에도 다시 감쌀 필요가 없습니다. Windows는 기존처럼 스크립트 런처를 제자리에서 감싸며 실제 `codex.exe`는 건드리지 않습니다. Windows에서 `codex.exe`만 제공된다면 `ocx service install`을 사용하세요.
diff --git a/docs-site/src/content/docs/reference/cli/lifecycle.md b/docs-site/src/content/docs/reference/cli/lifecycle.md
index 7baa048e2ab..17f424b3317 100644
--- a/docs-site/src/content/docs/reference/cli/lifecycle.md
+++ b/docs-site/src/content/docs/reference/cli/lifecycle.md
@@ -827,6 +827,9 @@ that PID now. Wait for the operation to finish and retry; do not delete the lock
 process based only on this PID. A later mutation attempt can reclaim a stale lease once its
 age exceeds 30 seconds and the recorded PID is no longer alive; status only inspects it.
 
+On Windows, this shared Node/Bun diagnostic does not launch an executable to look up the
+image name; the recorded PID, liveness, lease age and recovery guidance remain available.
+
 ### `ocx codex-shim <install|status|uninstall|remove>`
 
 On macOS and Linux, install a private autostart wrapper at `<OPENCODEX_HOME>/bin/codex` and a
diff --git a/scripts/test-layout/layout.json b/scripts/test-layout/layout.json
index 5a6f6c0f21f..1317c303564 100644
--- a/scripts/test-layout/layout.json
+++ b/scripts/test-layout/layout.json
@@ -1698,7 +1698,7 @@
     "service-claim.test.ts": "service",
     "service-ownership-compatibility.test.ts": "service",
     "service-ownership-handover.test.ts": "service",
-    "service-ownership-state.test.ts": "service",
+    "service-ownership-state.test.ts": "service", "ownership-mutation-lease-diagnostics.test.ts": "service",
     "service-probe-docker.test.ts": "service",
     "service-secrets.test.ts": "service",
     "service-sqlite-home.test.ts": "service",
diff --git a/src/service/ownership-mutation-lease.d.mts b/src/service/ownership-mutation-lease.d.mts
index c01d63f7279..8ee827777ed 100644
--- a/src/service/ownership-mutation-lease.d.mts
+++ b/src/service/ownership-mutation-lease.d.mts
@@ -5,7 +5,7 @@ export interface OwnershipMutationLeaseOptions {
   readonly processAlive?: (pid: number) => boolean;
   readonly beforeRelease?: (lockPath: string) => void;
   readonly joinToken?: string;
-  /** Names the current executable at the recorded PID, identity unverified; defaults to `tasklist` or `ps`. */
+  /** Names the current executable at the recorded PID, identity unverified; uses `ps` on POSIX and omits the default image lookup on Windows. */
   readonly processImage?: (pid: number) => string | null;
 }
 
diff --git a/src/service/ownership-mutation-lease.mjs b/src/service/ownership-mutation-lease.mjs
index 07eab51e1a9..9b95bd5aa7f 100644
--- a/src/service/ownership-mutation-lease.mjs
+++ b/src/service/ownership-mutation-lease.mjs
@@ -112,13 +112,11 @@ function readIncompleteOwner(path) {
 /** The current executable at the recorded PID, identity unverified; null if unreadable within a second. */
 function processImage(pid) {
   try {
-    if (process.platform === "win32") {
-      const listed = spawnSync("tasklist", ["/FI", `PID eq ${pid}`, "/FO", "CSV", "/NH"], {
-        encoding: "utf8", timeout: 1_000, windowsHide: true,
-      });
-      const match = /^"([^"]+)","(\d+)"/.exec((listed.stdout ?? "").trim());
-      return listed.status === 0 && match && Number(match[2]) === pid ? match[1] : null;
-    }
+    // This module also runs in the Node npm/pnpm launcher, before Bun is available.
+    // Without a kernel-backed system-directory resolver, omit the optional Windows
+    // image label rather than searching the caller's directory/PATH or trusting env roots.
+    // PID, liveness, age and lease ownership decisions do not depend on this label.
+    if (process.platform === "win32") return null;
     const listed = spawnSync("ps", ["-o", "comm=", "-p", String(pid)], { encoding: "utf8", timeout: 1_000 });
     const command = (listed.stdout ?? "").trim();
     return listed.status === 0 && command ? basename(command) : null;
diff --git a/structure/ops/service-and-sidecars.md b/structure/ops/service-and-sidecars.md
index 4d72608adbd..64cc27a2950 100644
--- a/structure/ops/service-and-sidecars.md
+++ b/structure/ops/service-and-sidecars.md
@@ -162,7 +162,7 @@ an owner claim committed during the early probe cannot be followed by shared Cod
 When that lease is still busy after its wait, `acquireOwnershipMutationLease`
 (`src/service/ownership-mutation-lease.mjs`) names the holder in its error and on the error's
 `holder` field. That means the owner's PID, whether it is alive, a live holder's executable name
-when `tasklist`/`ps` answers within a second, and the owner's age on the clock stale recovery
+when POSIX `ps` answers within a second (the shared Node/Bun Windows path omits image lookup), and the owner's age on the clock stale recovery
 uses, plus the 30-second reclaim rule. `ocx service status` prints the same holder line whenever
 the lease directory exists. That read never reclaims.
 The connected-client branch, which returns into `startClientRuntime` before the server path,
diff --git a/structure/runtime.md b/structure/runtime.md
index d3eac545039..ae428036666 100644
--- a/structure/runtime.md
+++ b/structure/runtime.md
@@ -593,7 +593,7 @@ manager children. A replacement refusal passes through owner-aware recovery: onl
 owner revives the stopped runtime; foreign ownership stays transferred and unknown ownership
 remains a reported recovery requirement. Dashboard restart delegates the lease token to its `service repair` child, and releases the lease before that refresh: the service manager spawns `ocx start` outside the worker's process tree with no token, so the managed child must take the lease itself (#5760). Before the direct-start fallthrough kills or spawns on the port, the worker takes the lease back — a refresh that stayed claimed stops the restart — and re-runs the recorded-owner veto under it because a claim could have landed during the unleased refresh window. Direct start holds the same lease through bind plus PID and runtime-address publication. If listener rollback cannot prove the socket closed, the process retains its lease until exit.
 The registration is never deleted; `ocx service install` releases the marker only after the
-registration succeeds. Busy lease diagnostics name the recorded PID, current liveness and executable, and lease age. The process identity is unverified because a PID may be reused.
+registration succeeds. Busy lease diagnostics name the recorded PID, current liveness, optional executable (omitted by default on Windows), and lease age. The process identity is unverified because a PID may be reused.
 
 Bun updater lease and recovery behavior follows the [update transaction contract](ops/service-and-sidecars.md#bun-updater-ownership-transaction).
 
diff --git a/tests/fixtures/test-layout-expected.json b/tests/fixtures/test-layout-expected.json
index 700841acd0a..f57ac3b67ee 100644
--- a/tests/fixtures/test-layout-expected.json
+++ b/tests/fixtures/test-layout-expected.json
@@ -969,7 +969,7 @@
   "service-auth-qualified-localhost.test.ts": "service", "service-child-ownership.test.ts": "service",
   "service-handled-signal-exit.test.ts": "service", "service-claim.test.ts": "service",
   "service-ownership-compatibility.test.ts": "service", "service-ownership-handover.test.ts": "service",
-  "service-ownership-state.test.ts": "service", "service-probe-docker.test.ts": "service",
+  "service-ownership-state.test.ts": "service", "ownership-mutation-lease-diagnostics.test.ts": "service", "service-probe-docker.test.ts": "service",
   "service-secrets.test.ts": "service", "service-sqlite-home.test.ts": "service",
   "service-stop-verification.test.ts": "service", "service-tier-capability.test.ts": "service",
   "service-wsl-home-ownership.test.ts": "service", "service.test.ts": "service",
diff --git a/tests/service/ownership-mutation-lease-diagnostics.test.ts b/tests/service/ownership-mutation-lease-diagnostics.test.ts
new file mode 100644
index 00000000000..29091e73576
--- /dev/null
+++ b/tests/service/ownership-mutation-lease-diagnostics.test.ts
@@ -0,0 +1,127 @@
+import { afterEach, beforeEach, describe, expect, spyOn, test } from "bun:test";
+import * as childProcess from "node:child_process";
+import { existsSync, lstatSync, mkdirSync, mkdtempSync, readFileSync, readdirSync, rmSync, utimesSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import {
+  acquireOwnershipMutationLease,
+  inspectOwnershipMutationLease,
+  ownershipMutationLeaseStatusLine,
+} from "../../src/service/ownership-mutation-lease.mjs";
+
+describe("ownership mutation lease diagnostic lookup (carry #6655)", () => {
+  const instance = "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa";
+  const token = "bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb";
+  const pid = 6236;
+  let root: string;
+  let paths: string[];
+  let lock: string;
+  let owner: string;
+
+  beforeEach(() => {
+    root = mkdtempSync(join(tmpdir(), "ocx-lease-diagnostics-"));
+    paths = [join(root, "service-state.json")];
+    lock = `${paths[0]}.mutation.lock`;
+    owner = join(lock, `v1-${pid}-${instance}-${token}.json`);
+    mkdirSync(lock);
+    writeFileSync(owner, JSON.stringify({ version: 1, pid, processInstance: instance, token, createdAt: 1_000 }));
+    utimesSync(owner, 1, 1);
+  });
+
+  afterEach(() => rmSync(root, { recursive: true, force: true }));
+
+  function onPlatform(platform: NodeJS.Platform, run: () => void) {
+    const descriptor = Object.getOwnPropertyDescriptor(process, "platform")!;
+    try {
+      Object.defineProperty(process, "platform", { ...descriptor, value: platform });
+      run();
+    } finally {
+      Object.defineProperty(process, "platform", descriptor);
+    }
+  }
+
+  function interceptLookup(stdout: string) {
+    return spyOn(childProcess, "spawnSync").mockReturnValue({
+      status: 0, stdout, stderr: "", pid: 1, output: [null, stdout, ""], signal: null,
+    });
+  }
+
+  test("Windows inspection, status and busy refusal launch zero diagnostic subprocesses and preserve the owner", () => {
+    const bytes = readFileSync(owner);
+    const identity = lstatSync(owner);
+    const spawned = interceptLookup(`"untrusted-tasklist.exe","${pid}"`);
+    try {
+      onPlatform("win32", () => {
+        const options = { now: () => 213_000, processAlive: () => true };
+        expect(inspectOwnershipMutationLease(paths, options))
+          .toMatchObject({ pid, alive: true, image: null, ageMs: 212_000, record: "complete" });
+        const line = ownershipMutationLeaseStatusLine(paths, options);
+        expect(line).toContain(`recorded PID ${pid} [alive, identity unverified], lease age 212s`);
+        expect(line).toContain("stale leases are reclaimed after 30s once the recorded PID is no longer alive.");
+        let busy: unknown;
+        try {
+          acquireOwnershipMutationLease(paths, { ...options, waitMs: 0 }).release();
+        } catch (error) { busy = error; }
+        expect(busy).toBeInstanceOf(Error);
+        expect(busy).toMatchObject({
+          code: "OWNERSHIP_MUTATION_LEASE_BUSY",
+          holder: { pid, alive: true, image: null, ageMs: 212_000, record: "complete" },
+        });
+        expect((busy as Error).message).toContain("another process owns the runtime mutation lease");
+        expect(spawned).not.toHaveBeenCalled();
+      });
+    } finally { spawned.mockRestore(); }
+    expect(readFileSync(owner)).toEqual(bytes);
+    expect(lstatSync(owner)).toMatchObject({ dev: identity.dev, ino: identity.ino, mtimeMs: identity.mtimeMs });
+    expect(readdirSync(lock)).toEqual([`v1-${pid}-${instance}-${token}.json`]);
+  });
+
+  test("Windows status leaves a stale dead owner intact and acquisition still reclaims it", () => {
+    const bytes = readFileSync(owner);
+    const spawned = interceptLookup("must not be used");
+    try {
+      onPlatform("win32", () => {
+        const options = { now: () => 600_000, processAlive: () => false };
+        expect(inspectOwnershipMutationLease(paths, options))
+          .toMatchObject({ pid, alive: false, image: null, ageMs: 599_000 });
+        expect(ownershipMutationLeaseStatusLine(paths, options)).toContain(`[not alive, identity unverified]`);
+        expect(readFileSync(owner)).toEqual(bytes);
+        const lease = acquireOwnershipMutationLease(paths, { ...options, waitMs: 0 });
+        try {
+          expect(existsSync(owner)).toBe(false);
+          const entry = readdirSync(lock)[0];
+          expect(JSON.parse(readFileSync(join(lock, entry), "utf8")))
+            .toMatchObject({ pid: process.pid, token: lease.token });
+        } finally { lease.release(); }
+        expect(existsSync(lock)).toBe(false);
+        expect(spawned).not.toHaveBeenCalled();
+      });
+    } finally { spawned.mockRestore(); }
+  });
+
+  test("POSIX diagnostics retain the bounded ps lookup and executable basename", () => {
+    const spawned = interceptLookup(" /usr/local/bin/lease-holder \n");
+    try {
+      onPlatform("linux", () => {
+        expect(inspectOwnershipMutationLease(paths, { now: () => 2_000, processAlive: () => true }))
+          .toMatchObject({ pid, alive: true, image: "lease-holder", ageMs: 1_000 });
+        expect(spawned).toHaveBeenCalledTimes(1);
+        expect(spawned).toHaveBeenCalledWith("ps", ["-o", "comm=", "-p", String(pid)], {
+          encoding: "utf8", timeout: 1_000,
+        });
+      });
+    } finally { spawned.mockRestore(); }
+  });
+
+  test("Windows still accepts an explicitly supplied optional image resolver", () => {
+    const spawned = interceptLookup("must not be used");
+    try {
+      onPlatform("win32", () => {
+        const image = (recordedPid: number) => recordedPid === pid ? "supplied-image.exe" : null;
+        expect(inspectOwnershipMutationLease(paths, { processAlive: () => true, processImage: image }))
+          .toMatchObject({ pid, alive: true, image: "supplied-image.exe" });
+        expect(spawned).not.toHaveBeenCalled();
+      });
+    } finally { spawned.mockRestore(); }
+  });
+});