diff --git a/lang_agent/front_api/build_server.py b/lang_agent/front_api/build_server.py
deleted file mode 100644
index 6c7988a..0000000
--- a/lang_agent/front_api/build_server.py
+++ /dev/null
@@ -1,71 +0,0 @@
-from typing import Dict, List, Optional
-import os
-import subprocess
-
-def build_route(pipeline_id:str,
-                prompt_set:str,
-                tool_keys:List[str],
-                port:str,
-                api_key: str,
-                fast_auth_keys: Optional[str] = None,
-                entry_pnt:str="fastapi_server/server_dashscope.py",
-                llm_name:str="qwen-plus"):
-    cmd = [
-        "python", entry_pnt,
-        "--port", str(port),
-        "route",            # ------------
-        "--llm-name", llm_name,
-        "--api-key", api_key,
-        "--pipeline-id", pipeline_id,
-        "--prompt-set-id", prompt_set,
-        "tool_node",        # ------------
-        "--llm-name", llm_name,
-        "--api-key", api_key,
-        "--pipeline-id", pipeline_id,
-        "--prompt-set-id", prompt_set,
-        ]
-    if tool_keys:
-        cmd.extend(
-            ["--tool-manager-config.client-tool-manager.tool-keys", *tool_keys]
-        )
-    env: Dict[str, str] = os.environ.copy()
-    if fast_auth_keys:
-        env["FAST_AUTH_KEYS"] = fast_auth_keys
-    sv_prc = subprocess.Popen(cmd, env=env)
-
-    return sv_prc, f"http://127.0.0.1:{port}/api/"
-
-
-def build_react(pipeline_id:str,
-                prompt_set:str,
-                tool_keys:List[str],
-                port:str,
-                api_key: str,
-                fast_auth_keys: Optional[str] = None,
-                entry_pnt:str="fastapi_server/server_dashscope.py",
-                llm_name:str="qwen-plus"):
-    cmd = [
-        "python", entry_pnt,
-        "--port", str(port),
-        "react",            # ------------
-        "--llm-name", llm_name,
-        "--api-key", api_key,
-        "--pipeline-id", pipeline_id,
-        "--prompt-set-id", prompt_set,
-        ]
-    if tool_keys:
-        cmd.extend(
-            ["--tool-manager-config.client-tool-manager.tool-keys", *tool_keys]
-        )
-    env: Dict[str, str] = os.environ.copy()
-    if fast_auth_keys:
-        env["FAST_AUTH_KEYS"] = fast_auth_keys
-    sv_prc = subprocess.Popen(cmd, env=env)
-
-    return sv_prc, f"http://127.0.0.1:{port}/api/"
-
-# {pipeline_id: build_function}
-GRAPH_BUILD_FNCS = {
-    "routing": build_route,
-    "react": build_react,
-}
\ No newline at end of file
diff --git a/lang_agent/front_api/build_server_utils.py b/lang_agent/front_api/build_server_utils.py
new file mode 100644
index 0000000..05314f3
--- /dev/null
+++ b/lang_agent/front_api/build_server_utils.py
@@ -0,0 +1,134 @@
+from typing import Dict, List, Optional
+import os
+import os.path as osp
+import subprocess
+import json
+
+from lang_agent.config.core_config import load_tyro_conf
+
+def opt_to_config(save_path:str, *nargs):
+    os.makedirs(osp.dirname(save_path), exist_ok=True)
+    subprocess.run(["python", "--save-path", save_path, *nargs])
+
+
+def update_pipeline_registry(pipeline_id:str, 
+                             prompt_set:str,
+                             registry_f:str="configs/pipeline_registry.json"):
+    with open(registry_f, "r") as f:
+        registry = json.load(f)
+    
+    if pipeline_id not in registry["routes"]:
+        registry["routes"][pipeline_id] = {
+            "enabled": True,
+            "config_file": None,
+            "prompt_pipeline_id": prompt_set,
+        }
+    else:
+        registry["routes"][pipeline_id]["prompt_pipeline_id"] = prompt_set
+
+    with open(registry_f, "w") as f:
+        json.dump(registry, f, indent=4)
+
+
+
+# def build_route(pipeline_id:str,
+#                 prompt_set:str,
+#                 tool_keys:List[str],
+#                 port:str,
+#                 api_key: str,
+#                 fast_auth_keys: Optional[str] = None,
+#                 entry_pnt:str="fastapi_server/server_dashscope.py",
+#                 llm_name:str="qwen-plus"):
+#     cmd = [
+#         "python", entry_pnt,
+#         "--port", str(port),
+#         "route",            # ------------
+#         "--llm-name", llm_name,
+#         "--api-key", api_key,
+#         "--pipeline-id", pipeline_id,
+#         "--prompt-set-id", prompt_set,
+#         "tool_node",        # ------------
+#         "--llm-name", llm_name,
+#         "--api-key", api_key,
+#         "--pipeline-id", pipeline_id,
+#         "--prompt-set-id", prompt_set,
+#         ]
+#     if tool_keys:
+#         cmd.extend(
+#             ["--tool-manager-config.client-tool-manager.tool-keys", *tool_keys]
+#         )
+#     env: Dict[str, str] = os.environ.copy()
+#     if fast_auth_keys:
+#         env["FAST_AUTH_KEYS"] = fast_auth_keys
+#     sv_prc = subprocess.Popen(cmd, env=env)
+
+#     return sv_prc, f"http://127.0.0.1:{port}/api/"
+
+def build_route(pipeline_id:str,
+                prompt_set:str,
+                tool_keys:List[str],
+                api_key: str,
+                entry_pnt:str="fastapi_server/server_dashscope.py",
+                llm_name:str="qwen-plus",
+                pipeline_config_dir="configs/pipelines"):
+    cmd = [
+        "python", entry_pnt,
+        "route",            # ------------
+        "--llm-name", llm_name,
+        "--api-key", api_key,
+        "--pipeline-id", pipeline_id,
+        "--prompt-set-id", prompt_set,
+        "tool_node",        # ------------
+        "--llm-name", llm_name,
+        "--api-key", api_key,
+        "--pipeline-id", pipeline_id,
+        "--prompt-set-id", prompt_set,
+        ]
+    
+    if tool_keys:
+        cmd.extend(
+            ["--tool-manager-config.client-tool-manager.tool-keys", *tool_keys]
+        )
+
+    save_config_f = osp.join(pipeline_config_dir, f"{pipeline_id}.yml")
+    opt_to_config(save_config_f, *cmd)
+
+    # TODO: think if returning the built pipeline is better or just the config obj for front_api
+    return load_tyro_conf(save_config_f)
+
+
+
+
+def build_react(pipeline_id:str,
+                prompt_set:str,
+                tool_keys:List[str],
+                port:str,
+                api_key: str,
+                fast_auth_keys: Optional[str] = None,
+                entry_pnt:str="fastapi_server/server_dashscope.py",
+                llm_name:str="qwen-plus"):
+    cmd = [
+        "python", entry_pnt,
+        "--port", str(port),
+        "react",            # ------------
+        "--llm-name", llm_name,
+        "--api-key", api_key,
+        "--pipeline-id", pipeline_id,
+        "--prompt-set-id", prompt_set,
+        ]
+    if tool_keys:
+        cmd.extend(
+            ["--tool-manager-config.client-tool-manager.tool-keys", *tool_keys]
+        )
+    env: Dict[str, str] = os.environ.copy()
+    if fast_auth_keys:
+        env["FAST_AUTH_KEYS"] = fast_auth_keys
+    sv_prc = subprocess.Popen(cmd, env=env)
+
+    return sv_prc, f"http://127.0.0.1:{port}/api/"
+
+# {pipeline_id: build_function}
+GRAPH_BUILD_FNCS = {
+    "routing": build_route,
+    "react": build_react,
+}
\ No newline at end of file