diff --git a/extensions/matrix/package.json b/extensions/matrix/package.json
index 2ace082d928..86e9cf0953f 100644
--- a/extensions/matrix/package.json
+++ b/extensions/matrix/package.json
@@ -24,8 +24,7 @@
   },
   "openclaw": {
     "extensions": [
-      "./index.ts",
-      "./src/plugin-entry.runtime.ts"
+      "./index.ts"
     ],
     "setupEntry": "./setup-entry.ts",
     "channel": {
diff --git a/src/plugin-sdk/plugin-entry-guardrails.test.ts b/src/plugin-sdk/plugin-entry-guardrails.test.ts
index bb7d7ee3128..3866b18a653 100644
--- a/src/plugin-sdk/plugin-entry-guardrails.test.ts
+++ b/src/plugin-sdk/plugin-entry-guardrails.test.ts
@@ -12,6 +12,7 @@ const REPO_ROOT = resolve(ROOT_DIR, "..");
 const EXTENSIONS_DIR = resolve(REPO_ROOT, BUNDLED_PLUGIN_ROOT_DIR);
 const CORE_PLUGIN_ENTRY_IMPORT_RE =
   /import\s*\{[^}]*\bdefinePluginEntry\b[^}]*\}\s*from\s*"openclaw\/plugin-sdk\/core"/;
+const RUNTIME_ENTRY_HELPER_RE = /(^|\/)plugin-entry\.runtime\.[cm]?[jt]s$/;
 
 describe("plugin entry guardrails", () => {
   it("keeps bundled extension entry modules off direct definePluginEntry imports from core", () => {
@@ -34,4 +35,32 @@ describe("plugin entry guardrails", () => {
 
     expect(failures).toEqual([]);
   });
+
+  it("does not advertise runtime helper sidecars as bundled plugin entry extensions", () => {
+    const failures: string[] = [];
+
+    for (const entry of readdirSync(EXTENSIONS_DIR, { withFileTypes: true })) {
+      if (!entry.isDirectory()) {
+        continue;
+      }
+      const packageJsonPath = resolve(EXTENSIONS_DIR, entry.name, "package.json");
+      try {
+        const pkg = JSON.parse(readFileSync(packageJsonPath, "utf8")) as {
+          openclaw?: { extensions?: unknown };
+        };
+        const extensions = Array.isArray(pkg.openclaw?.extensions) ? pkg.openclaw.extensions : [];
+        if (
+          extensions.some(
+            (candidate) => typeof candidate === "string" && RUNTIME_ENTRY_HELPER_RE.test(candidate),
+          )
+        ) {
+          failures.push(bundledPluginFile(entry.name, "package.json"));
+        }
+      } catch {
+        // Skip directories without package metadata.
+      }
+    }
+
+    expect(failures).toEqual([]);
+  });
 });