diff --git a/package.json b/package.json
index 358212d42ed7..435eb46d66b3 100644
--- a/package.json
+++ b/package.json
@@ -2248,7 +2248,8 @@
   },
   "bundleDependencies": [
     "@openclaw/proxyline",
-    "chrome-devtools-mcp"
+    "chrome-devtools-mcp",
+    "undici"
   ],
   "dependencies": {
     "@agentclientprotocol/sdk": "1.4.0",
diff --git a/patches/README.md b/patches/README.md
index 2d4070de23ec..844edaea393a 100644
--- a/patches/README.md
+++ b/patches/README.md
@@ -8,7 +8,9 @@ agent to retain per-request `NO_PROXY` routing even when every configured proxy
 route is invalid. The patch changes only the package entrypoint and regenerated
 entrypoint declarations; proxy behavior and the package version are unchanged.
 The root package bundles the dependency so npm installations retain the export.
-Remove this patch, its registration, and the bundle entry when an upstream release
+Its pinned Undici peer is bundled too: npm infers that bundled peers are already
+present and otherwise skips installing Undici, even though the root requires it.
+Remove this patch, its registration, and both bundle entries when an upstream release
 exports the standalone agent and passes `extensions/whatsapp/src/session.media-upload.test.ts`
 and `src/infra/net/node-proxy-agent.test.ts` without the patch.
 
diff --git a/scripts/lib/package-bundled-dependencies.mts b/scripts/lib/package-bundled-dependencies.mts
index 9ee9a8a86e23..0a7c62f517b3 100644
--- a/scripts/lib/package-bundled-dependencies.mts
+++ b/scripts/lib/package-bundled-dependencies.mts
@@ -236,6 +236,18 @@ export function collectBundledDependencyErrors({
       errors.push(`bundled ${name} package.json must name ${name}`);
       continue;
     }
+    // npm infers peers of bundled packages are already in the bundle, while
+    // packlist excludes them unless explicitly bundled. Missing peers are not
+    // installed, even when the root declares them as required dependencies.
+    const peers = isRecord(manifest.peerDependencies) ? manifest.peerDependencies : {};
+    for (const peer of Object.keys(peers)) {
+      if (
+        typeof dependencies[peer] === "string" &&
+        !runtime.entries.has(`node_modules/${peer}/package.json`)
+      ) {
+        errors.push(`bundled ${name} is missing its root dependency peer ${peer}`);
+      }
+    }
     const bundled = { ...runtime, name };
     if (name === PATCHED_MCP_NAME) {
       errors.push(...collectPatchedMcpErrors(bundled, manifest, dependencies[PATCHED_MCP_NAME]));
diff --git a/test/scripts/check-openclaw-package-tarball.test.ts b/test/scripts/check-openclaw-package-tarball.test.ts
index 5239907b5e6a..22eac6583461 100644
--- a/test/scripts/check-openclaw-package-tarball.test.ts
+++ b/test/scripts/check-openclaw-package-tarball.test.ts
@@ -1085,6 +1085,52 @@ syncBuiltinESMExports();
   );
 
   const bundledRuntimeCases: NamedTarballCheck[] = [
+    ...[
+      { bundledPeer: false, optional: false },
+      { bundledPeer: false, optional: true },
+      { bundledPeer: true, optional: false },
+    ].map(({ bundledPeer, optional }): NamedTarballCheck => ({
+      name: `${bundledPeer ? "accepts" : "rejects"} a bundled dependency with ${bundledPeer ? "a bundled" : "a missing"} root-required ${optional ? "optional" : "required"} peer`,
+      files: {
+        "dist/index.js": "export {};\n",
+        "node_modules/example/package.json": JSON.stringify({
+          name: "example",
+          version: "1.0.0",
+          peerDependencies: { host: "^1.0.0" },
+          ...(optional ? { peerDependenciesMeta: { host: { optional: true } } } : {}),
+        }),
+        ...(bundledPeer
+          ? { "node_modules/host/package.json": '{"name":"host","version":"1.0.0"}\n' }
+          : {}),
+      },
+      options: {
+        packageJson: {
+          dependencies: { example: "1.0.0", host: "1.0.0" },
+          bundleDependencies: bundledPeer ? ["example", "host"] : ["example"],
+        },
+      },
+      status: bundledPeer ? 0 : "nonzero",
+      stderr: bundledPeer ? [] : ["bundled example is missing its root dependency peer host"],
+    })),
+    {
+      name: "accepts an absent optional peer of a bundled dependency",
+      files: {
+        "dist/index.js": "export {};\n",
+        "node_modules/example/package.json": JSON.stringify({
+          name: "example",
+          version: "1.0.0",
+          peerDependencies: { host: "^1.0.0" },
+          peerDependenciesMeta: { host: { optional: true } },
+        }),
+      },
+      options: {
+        packageJson: {
+          dependencies: { example: "1.0.0" },
+          bundleDependencies: ["example"],
+        },
+      },
+      status: 0,
+    },
     {
       name: "accepts npm-selected bundled and hoisted transitive dependency paths",
       files: {