diff --git a/agentchatbus-ts/package-lock.json b/agentchatbus-ts/package-lock.json
index a51d3d9..82234b5 100644
--- a/agentchatbus-ts/package-lock.json
+++ b/agentchatbus-ts/package-lock.json
@@ -14,8 +14,8 @@
         "@xterm/addon-fit": "^0.11.0",
         "@xterm/headless": "^6.0.0",
         "@xterm/xterm": "^6.0.0",
+        "cross-spawn": "^7.0.6",
         "fastify": "^5.2.1",
-        "node-pty": "^1.1.0",
         "zod": "^4.3.6"
       },
       "bin": {
@@ -34,6 +34,9 @@
       },
       "engines": {
         "node": ">=20"
+      },
+      "optionalDependencies": {
+        "node-pty": "^1.1.0"
       }
     },
     "node_modules/@esbuild/aix-ppc64": {
@@ -2681,7 +2684,8 @@
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-7.1.1.tgz",
       "integrity": "sha512-5m3bsyrjFWE1xf7nz7YXdN4udnVtXK6/Yfgn5qnahL6bCkf2yKt4k3nuTKAtT4r3IG8JNR2ncsIMdZuAzJjHQQ==",
-      "license": "MIT"
+      "license": "MIT",
+      "optional": true
     },
     "node_modules/node-pty": {
       "version": "1.1.0",
@@ -2689,6 +2693,7 @@
       "integrity": "sha512-20JqtutY6JPXTUnL0ij1uad7Qe1baT46lyolh2sSENDd4sTzKZ4nmAFkeAARDKwmlLjPx6XKRlwRUxwjOy+lUg==",
       "hasInstallScript": true,
       "license": "MIT",
+      "optional": true,
       "dependencies": {
         "node-addon-api": "^7.1.0"
       }
diff --git a/agentchatbus-ts/package.json b/agentchatbus-ts/package.json
index d89255b..f26eba7 100644
--- a/agentchatbus-ts/package.json
+++ b/agentchatbus-ts/package.json
@@ -39,5 +39,8 @@
     "tsx": "^4.19.2",
     "typescript": "^5.8.2",
     "vitest": "^3.1.1"
+  },
+  "optionalDependencies": {
+    "node-pty": "^1.1.0"
   }
 }