diff --git a/scalpels/agents/base.py b/scalpels/agents/base.py
index 0cb4d75..dab8683 100644
--- a/scalpels/agents/base.py
+++ b/scalpels/agents/base.py
@@ -10,7 +10,7 @@ def run_agent(task_uuid, ag):
     """
     python <path-to-dir>/agent.py <uuid> mysql
     """
-    cmd = "python %s/agent.py %s %s" % (data_dir, task_uuid, ag)
+    cmd = "sca-tracer %s %s" % (task_uuid, ag)
     ag = subprocess.Popen(cmd.split())
     return ag.pid
 
diff --git a/scalpels/cmd/agent.py b/scalpels/cmd/agent.py
index 0723925..5d0195c 100644
--- a/scalpels/cmd/agent.py
+++ b/scalpels/cmd/agent.py
@@ -5,11 +5,9 @@
 from scalpels.agents.server import server
 
 def main():
-    try:
-        server.start()
-        server.wait()
-    except KeyboardInterrupt:
-        server.stop()
+    # TODO handle stop later
+    server.start()
+    server.wait()
 
 if __name__ == "__main__":
     main()
diff --git a/scalpels/cmd/tracer.py b/scalpels/cmd/tracer.py
index eb7a8b8..3dbbea4 100644
--- a/scalpels/cmd/tracer.py
+++ b/scalpels/cmd/tracer.py
@@ -2,8 +2,67 @@
 #-*- coding:utf-8 -*-
 # Author: Kun Huang <academicgareth@gmail.com>
 
+import subprocess
+import psutil
+import sys
+from scalpels.db import api as db_api
+from copy import deepcopy as copy
+import signal
+from tooz import coordination
+import time
+from scalpels.agents import base
+
+"""
+example:
+    sca-tracer <uuid> mysql
+TODO:
+    add help (-h) message
+    config key-word arguments for each tracer
+"""
+
+def read_from_ag(ag):
+    # wrong impl. here, need read from config or db instead
+    from scalpels.client.utils import tracers_map as agents_map
+    data_dir = db_api.setup_config_get()["data_dir"].rstrip("/")
+    return agents_map.get(ag) % data_dir
+
 def main():
-    raise NotImplementedError()
+    task_uuid, ag = sys.argv[1], sys.argv[2]
+    cmd = read_from_ag(ag)
+
+    worker = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
+    out = []
+    try:
+        while True:
+            t = worker.stdout.readline()
+            if not len(t):
+                break
+            _t = (time.time(), t.strip())
+            out.append(_t)
+    except KeyboardInterrupt:
+        pass
+
+    # psutil is much more professional... I have to use it instead
+    # this kill is to script process
+    worker_p = psutil.Process(worker.pid)
+    worker_p.send_signal(signal.SIGINT)
+
+    parse_func = getattr(base, "parse_%s" % ag)
+
+    # TODO file lock is okay in localhost, here need redis for distributed
+    # lock istead
+    co = coordination.get_coordinator("file:///tmp", b"localhost")
+    co.start()
+    lock = co.get_lock("task_update_lock")
+    with lock:
+        task = db_api.task_get(task_uuid)
+        results = copy(task.results)
+        for ret in parse_func(out):
+            ret = db_api.result_create(**ret)
+            results.append(ret.uuid)
+        db_api.task_update(task_uuid, results=results)
+        time.sleep(2)
+    co.stop()
 
 if __name__ == "__main__":
     main()
diff --git a/scripts/agent.py b/scripts/agent.py
deleted file mode 100755
index 80f4f39..0000000
--- a/scripts/agent.py
+++ /dev/null
@@ -1,61 +0,0 @@
-#!/usr/bin/env python
-#-*- coding:utf-8 -*-
-# Author: Kun Huang <academicgareth@gmail.com>
-
-import subprocess
-import psutil
-import sys
-from scalpels.db import api as db_api
-from copy import deepcopy as copy
-import signal
-from tooz import coordination
-import time
-from scalpels.agents import base
-
-"""
-python <path-to-dir>/agent.py <uuid> mysql
-"""
-
-def read_from_ag(ag):
-    # wrong impl. here, need read from config or db instead
-    from scalpels.client.utils import tracers_map as agents_map
-    data_dir = db_api.setup_config_get()["data_dir"].rstrip("/")
-    return agents_map.get(ag) % data_dir
-
-if __name__ == "__main__":
-    task_uuid, ag = sys.argv[1], sys.argv[2]
-    cmd = read_from_ag(ag)
-
-    worker = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
-    out = []
-    try:
-        while True:
-            t = worker.stdout.readline()
-            if not len(t):
-                break
-            _t = (time.time(), t.strip())
-            out.append(_t)
-    except KeyboardInterrupt:
-        pass
-
-    # psutil is much more professional... I have to use it instead
-    # this kill is to script process
-    worker_p = psutil.Process(worker.pid)
-    worker_p.send_signal(signal.SIGINT)
-
-    parse_func = getattr(base, "parse_%s" % ag)
-
-    # TODO file lock is okay in localhost, here need redis for distributed
-    # lock istead
-    co = coordination.get_coordinator("file:///tmp", b"localhost")
-    co.start()
-    lock = co.get_lock("task_update_lock")
-    with lock:
-        task = db_api.task_get(task_uuid)
-        results = copy(task.results)
-        for ret in parse_func(out):
-            ret = db_api.result_create(**ret)
-            results.append(ret.uuid)
-        db_api.task_update(task_uuid, results=results)
-        time.sleep(2)
-    co.stop()