diff --git a/src/plugin-sdk/facade-activation-check.runtime.ts b/src/plugin-sdk/facade-activation-check.runtime.ts
index ceeb27ed2c3..87752a9043d 100644
--- a/src/plugin-sdk/facade-activation-check.runtime.ts
+++ b/src/plugin-sdk/facade-activation-check.runtime.ts
@@ -16,7 +16,10 @@ import {
   loadPluginManifestRegistry,
   type PluginManifestRecord,
 } from "../plugins/manifest-registry.js";
-import { normalizeBundledPluginArtifactSubpath } from "../plugins/public-surface-runtime.js";
+import {
+  PUBLIC_SURFACE_SOURCE_EXTENSIONS,
+  normalizeBundledPluginArtifactSubpath,
+} from "../plugins/public-surface-runtime.js";
 
 const ALWAYS_ALLOWED_RUNTIME_DIR_NAMES = new Set([
   "image-generation-core",
@@ -60,7 +63,6 @@ type FacadeModuleLocation = {
   modulePath: string;
   boundaryRoot: string;
 };
-const PUBLIC_SURFACE_SOURCE_EXTENSIONS = [".ts", ".mts", ".js", ".mjs", ".cts", ".cjs"] as const;
 
 function readFacadeBoundaryConfigSafely(): {
   rawConfig: OpenClawConfig;
diff --git a/src/plugin-sdk/facade-loader.ts b/src/plugin-sdk/facade-loader.ts
index e33ae5e2717..d19ac2eeed6 100644
--- a/src/plugin-sdk/facade-loader.ts
+++ b/src/plugin-sdk/facade-loader.ts
@@ -10,13 +10,13 @@ import {
   type PluginJitiLoaderFactory,
 } from "../plugins/jiti-loader-cache.js";
 import {
+  PUBLIC_SURFACE_SOURCE_EXTENSIONS,
   normalizeBundledPluginArtifactSubpath,
   resolveBundledPluginPublicSurfacePath,
 } from "../plugins/public-surface-runtime.js";
 import { resolveLoaderPackageRoot } from "../plugins/sdk-alias.js";
 
 const CURRENT_MODULE_PATH = fileURLToPath(import.meta.url);
-const PUBLIC_SURFACE_SOURCE_EXTENSIONS = [".ts", ".mts", ".js", ".mjs", ".cts", ".cjs"] as const;
 
 const nodeRequire = createRequire(import.meta.url);
 const jitiLoaders: PluginJitiLoaderCache = new Map();
diff --git a/src/plugin-sdk/facade-runtime.ts b/src/plugin-sdk/facade-runtime.ts
index d5c2eadb18f..80a1d9a7ddc 100644
--- a/src/plugin-sdk/facade-runtime.ts
+++ b/src/plugin-sdk/facade-runtime.ts
@@ -5,6 +5,7 @@ import { fileURLToPath } from "node:url";
 import { resolveBundledPluginsDir } from "../plugins/bundled-dir.js";
 import type { PluginManifestRecord } from "../plugins/manifest-registry.js";
 import {
+  PUBLIC_SURFACE_SOURCE_EXTENSIONS,
   normalizeBundledPluginArtifactSubpath,
   resolveBundledPluginPublicSurfacePath,
 } from "../plugins/public-surface-runtime.js";
@@ -27,7 +28,6 @@ const OPENCLAW_PACKAGE_ROOT =
     moduleUrl: import.meta.url,
   }) ?? fileURLToPath(new URL("../..", import.meta.url));
 const CURRENT_MODULE_PATH = fileURLToPath(import.meta.url);
-const PUBLIC_SURFACE_SOURCE_EXTENSIONS = [".ts", ".mts", ".js", ".mjs", ".cts", ".cjs"] as const;
 const OPENCLAW_SOURCE_EXTENSIONS_ROOT = path.resolve(OPENCLAW_PACKAGE_ROOT, "extensions");
 const cachedFacadeModuleLocationsByKey = new Map<
   string,
diff --git a/src/plugins/bundled-channel-config-metadata.ts b/src/plugins/bundled-channel-config-metadata.ts
index 79324d426c1..b8f4bdab328 100644
--- a/src/plugins/bundled-channel-config-metadata.ts
+++ b/src/plugins/bundled-channel-config-metadata.ts
@@ -13,8 +13,8 @@ import type {
   PluginManifest,
   PluginManifestChannelConfig,
 } from "./manifest.js";
+import { PUBLIC_SURFACE_SOURCE_EXTENSIONS } from "./public-surface-runtime.js";
 
-const PUBLIC_SURFACE_SOURCE_EXTENSIONS = [".ts", ".mts", ".js", ".mjs", ".cts", ".cjs"] as const;
 const SOURCE_CONFIG_SCHEMA_CANDIDATES = [
   path.join("src", "config-schema.ts"),
   path.join("src", "config-schema.js"),
diff --git a/src/plugins/bundled-plugin-scan.ts b/src/plugins/bundled-plugin-scan.ts
index 61ae99e4df3..73dfd77275f 100644
--- a/src/plugins/bundled-plugin-scan.ts
+++ b/src/plugins/bundled-plugin-scan.ts
@@ -2,8 +2,8 @@ import fs from "node:fs";
 import path from "node:path";
 import { normalizeOptionalString } from "../shared/string-coerce.js";
 import { normalizeTrimmedStringList } from "../shared/string-normalization.js";
+import { PUBLIC_SURFACE_SOURCE_EXTENSIONS } from "./public-surface-runtime.js";
 
-const PUBLIC_SURFACE_SOURCE_EXTENSIONS = [".ts", ".mts", ".js", ".mjs", ".cts", ".cjs"] as const;
 const RUNTIME_SIDECAR_ARTIFACTS = new Set([
   "helper-api.js",
   "light-runtime-api.js",
diff --git a/src/plugins/public-surface-runtime.test.ts b/src/plugins/public-surface-runtime.test.ts
index 96b57224740..d6364eb0e08 100644
--- a/src/plugins/public-surface-runtime.test.ts
+++ b/src/plugins/public-surface-runtime.test.ts
@@ -1,7 +1,21 @@
 import { describe, expect, it } from "vitest";
-import { normalizeBundledPluginArtifactSubpath } from "./public-surface-runtime.js";
+import {
+  PUBLIC_SURFACE_SOURCE_EXTENSIONS,
+  normalizeBundledPluginArtifactSubpath,
+} from "./public-surface-runtime.js";
 
 describe("bundled plugin public surface runtime", () => {
+  it("exports the canonical public surface source extension list", () => {
+    expect(PUBLIC_SURFACE_SOURCE_EXTENSIONS).toEqual([
+      ".ts",
+      ".mts",
+      ".js",
+      ".mjs",
+      ".cts",
+      ".cjs",
+    ]);
+  });
+
   it("allows plugin-local nested artifact paths", () => {
     expect(normalizeBundledPluginArtifactSubpath("src/outbound-adapter.js")).toBe(
       "src/outbound-adapter.js",
diff --git a/src/plugins/public-surface-runtime.ts b/src/plugins/public-surface-runtime.ts
index d7f1e7d4571..b76d1a30a4c 100644
--- a/src/plugins/public-surface-runtime.ts
+++ b/src/plugins/public-surface-runtime.ts
@@ -2,7 +2,14 @@ import fs from "node:fs";
 import path from "node:path";
 import { resolveBundledPluginsDir } from "./bundled-dir.js";
 
-const PUBLIC_SURFACE_SOURCE_EXTENSIONS = [".ts", ".mts", ".js", ".mjs", ".cts", ".cjs"] as const;
+export const PUBLIC_SURFACE_SOURCE_EXTENSIONS = [
+  ".ts",
+  ".mts",
+  ".js",
+  ".mjs",
+  ".cts",
+  ".cjs",
+] as const;
 
 export function normalizeBundledPluginArtifactSubpath(artifactBasename: string): string {
   if (