diff --git a/src/plugin-sdk/root-alias.cjs b/src/plugin-sdk/root-alias.cjs
index 27ab182d349..2c91cbdb61c 100644
--- a/src/plugin-sdk/root-alias.cjs
+++ b/src/plugin-sdk/root-alias.cjs
@@ -8,6 +8,7 @@ let diagnosticEventsModule = null;
 const jitiLoaders = new Map();
 const pluginSdkSubpathsCache = new Map();
 const pluginSdkPackageNames = ["openclaw/plugin-sdk", "@openclaw/plugin-sdk"];
+const pluginSdkSourceExtensions = [".ts", ".mts", ".js", ".mjs", ".cts", ".cjs"];
 const isDistRootAlias = __filename.includes(
   `${path.sep}dist${path.sep}plugin-sdk${path.sep}root-alias.cjs`,
 );
@@ -129,7 +130,6 @@ function listPluginSdkExportedSubpaths() {
 function buildPluginSdkAliasMap(useDist) {
   const packageRoot = getPackageRoot();
   const pluginSdkDir = path.join(packageRoot, useDist ? "dist" : "src", "plugin-sdk");
-  const ext = useDist ? ".js" : ".ts";
   const normalizeTarget = (target) =>
     process.platform === "win32" ? target.replace(/\\/g, "/") : target;
   const aliasMap = Object.fromEntries(
@@ -137,11 +137,24 @@ function buildPluginSdkAliasMap(useDist) {
   );
 
   for (const subpath of listPluginSdkExportedSubpaths()) {
-    const candidate = path.join(pluginSdkDir, `${subpath}${ext}`);
-    if (fs.existsSync(candidate)) {
+    if (useDist) {
+      const candidate = path.join(pluginSdkDir, `${subpath}.js`);
+      if (fs.existsSync(candidate)) {
+        for (const packageName of pluginSdkPackageNames) {
+          aliasMap[`${packageName}/${subpath}`] = normalizeTarget(candidate);
+        }
+      }
+      continue;
+    }
+    for (const ext of pluginSdkSourceExtensions) {
+      const candidate = path.join(pluginSdkDir, `${subpath}${ext}`);
+      if (!fs.existsSync(candidate)) {
+        continue;
+      }
       for (const packageName of pluginSdkPackageNames) {
         aliasMap[`${packageName}/${subpath}`] = normalizeTarget(candidate);
       }
+      break;
     }
   }
 
diff --git a/src/plugins/contracts/plugin-sdk-root-alias.test.ts b/src/plugins/contracts/plugin-sdk-root-alias.test.ts
index f4b5dca656e..599c373edf7 100644
--- a/src/plugins/contracts/plugin-sdk-root-alias.test.ts
+++ b/src/plugins/contracts/plugin-sdk-root-alias.test.ts
@@ -28,6 +28,7 @@ function loadRootAliasWithStubs(options?: {
   aliasPath?: string;
   packageExports?: Record<string, unknown>;
   platform?: string;
+  existingPaths?: string[];
 }) {
   let createJitiCalls = 0;
   let jitiLoadCalls = 0;
@@ -71,6 +72,9 @@ function loadRootAliasWithStubs(options?: {
           if (targetPath.endsWith(path.join("dist", "infra", "diagnostic-events.js"))) {
             return options?.distExists ?? false;
           }
+          if (options?.existingPaths?.includes(targetPath)) {
+            return true;
+          }
           return options?.distExists ?? false;
         },
         readdirSync: () =>
@@ -305,6 +309,35 @@ describe("plugin-sdk root alias", () => {
     ]);
   });
 
+  it("builds source plugin-sdk subpath aliases through the wider source extension family", () => {
+    const packageRoot = path.dirname(path.dirname(path.dirname(rootAliasPath)));
+    const lazyModule = loadRootAliasWithStubs({
+      packageExports: {
+        "./plugin-sdk/channel-runtime": { default: "./dist/plugin-sdk/channel-runtime.js" },
+      },
+      existingPaths: [path.join(packageRoot, "src", "plugin-sdk", "channel-runtime.mts")],
+      monolithicExports: {
+        slowHelper: (): string => "loaded",
+      },
+    });
+
+    expect((lazyModule.moduleExports.slowHelper as () => string)()).toBe("loaded");
+    expect(lazyModule.createJitiOptions.at(-1)?.alias).toMatchObject({
+      "openclaw/plugin-sdk/channel-runtime": path.join(
+        packageRoot,
+        "src",
+        "plugin-sdk",
+        "channel-runtime.mts",
+      ),
+      "@openclaw/plugin-sdk/channel-runtime": path.join(
+        packageRoot,
+        "src",
+        "plugin-sdk",
+        "channel-runtime.mts",
+      ),
+    });
+  });
+
   it("prefers hashed dist diagnostic events chunks before falling back to src", () => {
     const packageRoot = createPackageRoot();
     const distAliasPath = createDistAliasPath();