diff --git a/packages/core/package.json b/packages/core/package.json
index 9347cf5e72..fb61646d5a 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -20,8 +20,7 @@
     "typecheck": "tsc --noEmit"
   },
   "files": [
-    "dist",
-    "vendor"
+    "dist"
   ],
   "dependencies": {
     "@a2a-js/sdk": "0.3.11",
diff --git a/scripts/build_binary.js b/scripts/build_binary.js
index 7d0fd815c1..92532a45b0 100644
--- a/scripts/build_binary.js
+++ b/scripts/build_binary.js
@@ -179,6 +179,27 @@ try {
   process.exit(1);
 }
 
+// 2b. Copy host-platform ripgrep binary into the bundle for the SEA.
+// (npm tarballs omit these to stay under the registry upload limit.)
+const ripgrepVendorSrc = join(root, 'packages/core/vendor/ripgrep');
+const ripgrepVendorDest = join(bundleDir, 'vendor', 'ripgrep');
+if (existsSync(ripgrepVendorSrc)) {
+  const rgBinName = `rg-${process.platform}-${process.arch}${
+    process.platform === 'win32' ? '.exe' : ''
+  }`;
+  const rgSrc = join(ripgrepVendorSrc, rgBinName);
+  if (existsSync(rgSrc)) {
+    mkdirSync(ripgrepVendorDest, { recursive: true });
+    cpSync(rgSrc, join(ripgrepVendorDest, rgBinName), { dereference: true });
+    console.log(`Copied ${rgBinName} to bundle/vendor/ripgrep/`);
+  } else {
+    console.warn(
+      `Warning: bundled ripgrep binary not found for ${process.platform}/${process.arch} at ${rgSrc}. ` +
+        `The SEA will fall back to system grep at runtime.`,
+    );
+  }
+}
+
 // 3. Stage & Sign Native Modules
 const includeNativeModules = process.env.BUNDLE_NATIVE_MODULES !== 'false';
 console.log(`Include Native Modules: ${includeNativeModules}`);
@@ -304,6 +325,23 @@ if (existsSync(policyDir)) {
   }
 }
 
+// Add ripgrep binary (copied in step 2b). Must be registered here so that
+// sea-launch.cjs extracts it to runtimeDir/vendor/ripgrep/ on startup; the
+// runtime resolver in packages/core/src/tools/ripGrep.ts uses __dirname-
+// relative paths to find it.
+if (existsSync(ripgrepVendorDest)) {
+  const rgFiles = globSync('*', { cwd: ripgrepVendorDest, nodir: true });
+  for (const rgFile of rgFiles) {
+    const fsPath = join(ripgrepVendorDest, rgFile);
+    const relativePath = join('vendor', 'ripgrep', rgFile);
+    const content = readFileSync(fsPath);
+    const hash = sha256(content);
+    const assetKey = `vendor:${rgFile}`;
+    assets[assetKey] = fsPath;
+    manifest.files.push({ key: assetKey, path: relativePath, hash: hash });
+  }
+}
+
 // Add assets from Staging
 if (includeNativeModules) {
   addAssetsFromDir('node_modules/@lydell', 'node_modules/@lydell');
diff --git a/scripts/copy_bundle_assets.js b/scripts/copy_bundle_assets.js
index f1ea297ba9..658c0a57c0 100644
--- a/scripts/copy_bundle_assets.js
+++ b/scripts/copy_bundle_assets.js
@@ -108,19 +108,7 @@ if (!existsSync(bundleMcpSrc)) {
 cpSync(bundleMcpSrc, bundleMcpDest, { recursive: true, dereference: true });
 console.log('Copied bundled chrome-devtools-mcp to bundle/bundled/');
 
-// 7. Copy pre-built ripgrep vendor binaries
-const ripgrepVendorSrc = join(root, 'packages/core/vendor/ripgrep');
-const ripgrepVendorDest = join(bundleDir, 'vendor', 'ripgrep');
-if (existsSync(ripgrepVendorSrc)) {
-  mkdirSync(ripgrepVendorDest, { recursive: true });
-  cpSync(ripgrepVendorSrc, ripgrepVendorDest, {
-    recursive: true,
-    dereference: true,
-  });
-  console.log('Copied ripgrep vendor binaries to bundle/vendor/ripgrep/');
-}
-
-// 8. Copy Extension Examples
+// 7. Copy Extension Examples
 const extensionExamplesSrc = join(
   root,
   'packages/cli/src/commands/extensions/examples',