diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d92a86d20c..3bdc8110fe3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,7 @@ Docs: https://docs.openclaw.ai
 - Discord/voice: include a bounded one-line STT transcript preview in verbose voice logs so live voice debugging shows what speakers said before the agent reply.
 - Codex app-server: pin the managed Codex harness and Codex CLI smoke package to `@openai/codex@0.129.0`, defer OpenClaw integration dynamic tools behind Codex tool search by default, and accept current Codex service-tier values so legacy `fast` settings survive the stable harness upgrade as `priority`.
 - Codex app-server: default implicit local stdio app-server permissions to guardian when Codex system requirements disallow the YOLO approval, reviewer, or sandbox value, including hostname-scoped remote sandbox entries, avoiding turn-start failures on managed hosts that permit only reviewed approval or narrower sandboxes.
+- Plugins/install: run managed npm-root install, uninstall, prune, and repair commands from the managed root without a redundant `--prefix .`, avoiding npm 10.9.3 Arborist crashes on native Windows WhatsApp plugin installs. Fixes #78514. (#78902) Thanks @melihselamett-stack.
 - Discord/voice: stream ElevenLabs TTS directly into Discord playback and send ElevenLabs latency optimization as the documented query parameter so spoken replies can start sooner.
 - Discord/voice: keep TTS playback running when another user starts speaking, ignore new capture during playback to avoid feedback loops, and downgrade expected receive-stream aborts to verbose diagnostics.
 - iMessage: expose native private-API message actions through `imsg rpc` for reactions, edits, unsends, replies, rich sends, attachments, and group management when `imsg status --json` reports the required bridge capabilities.
diff --git a/docs/plugins/dependency-resolution.md b/docs/plugins/dependency-resolution.md
index 68a10b2b393..6017eb21093 100644
--- a/docs/plugins/dependency-resolution.md
+++ b/docs/plugins/dependency-resolution.md
@@ -41,7 +41,8 @@ OpenClaw uses stable per-source roots:
 npm installs run in the npm root with:
 
 ```bash
-npm install --prefix ~/.openclaw/npm <spec> --omit=dev --omit=peer --legacy-peer-deps --ignore-scripts --no-audit --no-fund
+cd ~/.openclaw/npm
+npm install --omit=dev --omit=peer --legacy-peer-deps --ignore-scripts --no-audit --no-fund
 ```
 
 `openclaw plugins install npm-pack:<path.tgz>` uses that same managed npm root
diff --git a/src/infra/npm-managed-root.test.ts b/src/infra/npm-managed-root.test.ts
index 5fca5b1c8b7..81c422babe8 100644
--- a/src/infra/npm-managed-root.test.ts
+++ b/src/infra/npm-managed-root.test.ts
@@ -398,8 +398,6 @@ describe("managed npm root", () => {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         "openclaw",
       ],
       expect.objectContaining({
diff --git a/src/infra/npm-managed-root.ts b/src/infra/npm-managed-root.ts
index fac2eaad8ee..dbc93ce7f37 100644
--- a/src/infra/npm-managed-root.ts
+++ b/src/infra/npm-managed-root.ts
@@ -245,8 +245,6 @@ export async function repairManagedNpmRootOpenClawPeer(params: {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         "openclaw",
       ]
     : [
@@ -257,8 +255,6 @@ export async function repairManagedNpmRootOpenClawPeer(params: {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
       ];
   try {
     const result = await command(npmArgs, {
diff --git a/src/plugins/install.npm-spec.test.ts b/src/plugins/install.npm-spec.test.ts
index eff92925f69..7bccb2d1d1a 100644
--- a/src/plugins/install.npm-spec.test.ts
+++ b/src/plugins/install.npm-spec.test.ts
@@ -69,8 +69,6 @@ function expectNpmInstallIntoRoot(params: { calls: unknown[][]; npmRoot: string
     "--ignore-scripts",
     "--no-audit",
     "--no-fund",
-    "--prefix",
-    ".",
   ]);
 }
 
@@ -290,9 +288,7 @@ function mockNpmViewAndInstallMany(packages: MockNpmPackage[]) {
         );
       }
       if (argv[0] === "npm" && argv[1] === "install") {
-        const prefixIndex = argv.indexOf("--prefix");
-        const prefixValue = prefixIndex >= 0 ? argv[prefixIndex + 1] : undefined;
-        const npmRoot = prefixValue === "." ? options?.cwd : prefixValue;
+        const npmRoot = options?.cwd;
         if (!npmRoot) {
           throw new Error(`unexpected npm install command: ${argv.join(" ")}`);
         }
@@ -345,9 +341,7 @@ function mockNpmViewAndInstallMany(packages: MockNpmPackage[]) {
       if (argv[0] === "npm" && argv[1] === "uninstall") {
         const packageName = argv.at(-1);
         if (packageName === "openclaw") {
-          const prefixIndex = argv.indexOf("--prefix");
-          const prefixValue = prefixIndex >= 0 ? argv[prefixIndex + 1] : undefined;
-          const npmRoot = prefixValue === "." ? options?.cwd : prefixValue;
+          const npmRoot = options?.cwd;
           if (!npmRoot) {
             throw new Error(`unexpected npm uninstall command: ${argv.join(" ")}`);
           }
diff --git a/src/plugins/install.ts b/src/plugins/install.ts
index c067d8ac75c..df04989bcf0 100644
--- a/src/plugins/install.ts
+++ b/src/plugins/install.ts
@@ -328,8 +328,6 @@ async function rollbackManagedNpmPluginInstall(params: {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         params.packageName,
       ],
       {
@@ -499,8 +497,6 @@ async function installPluginFromManagedNpmRoot(
         noAudit: true,
         noFund: true,
       }),
-      "--prefix",
-      ".",
     ],
     {
       cwd: npmRoot,
diff --git a/src/plugins/uninstall.test.ts b/src/plugins/uninstall.test.ts
index 5981192abb7..53ccf585042 100644
--- a/src/plugins/uninstall.test.ts
+++ b/src/plugins/uninstall.test.ts
@@ -992,8 +992,6 @@ describe("uninstallPlugin", () => {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         "@openclaw/kitchen-sink",
       ],
       expect.objectContaining({
@@ -1128,8 +1126,6 @@ describe("uninstallPlugin", () => {
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         "missing-plugin",
       ],
       expect.objectContaining({
diff --git a/src/plugins/uninstall.ts b/src/plugins/uninstall.ts
index bdfe8ea22aa..02e98ab8cfb 100644
--- a/src/plugins/uninstall.ts
+++ b/src/plugins/uninstall.ts
@@ -611,8 +611,6 @@ export async function applyPluginUninstallDirectoryRemoval(
         "--ignore-scripts",
         "--no-audit",
         "--no-fund",
-        "--prefix",
-        ".",
         removal.cleanup.packageName,
       ],
       {