diff --git a/nova/api/openstack/compute/agents.py b/nova/api/openstack/compute/agents.py
index d6247ddfb4de..9e7782b348dd 100644
--- a/nova/api/openstack/compute/agents.py
+++ b/nova/api/openstack/compute/agents.py
@@ -21,6 +21,7 @@ from nova.api.openstack import wsgi
 from nova.api import validation
 from nova import exception
 from nova import objects
+from nova import utils
 
 
 ALIAS = "os-agents"
@@ -88,6 +89,11 @@ class AgentController(wsgi.Controller):
         md5hash = para['md5hash']
         version = para['version']
 
+        try:
+            utils.validate_integer(id, 'id')
+        except exception.InvalidInput as exc:
+            raise webob.exc.HTTPBadRequest(explanation=exc.format_message())
+
         agent = objects.Agent(context=context, id=id)
         agent.obj_reset_changes()
         agent.version = version
@@ -109,13 +115,18 @@ class AgentController(wsgi.Controller):
     # TODO(oomichi): Here should be 204(No Content) instead of 200 by v2.1
     # +microversions because the resource agent has been deleted completely
     # when returning a response.
-    @extensions.expected_errors(404)
+    @extensions.expected_errors((400, 404))
     @wsgi.response(200)
     def delete(self, req, id):
         """Deletes an existing agent build."""
         context = req.environ['nova.context']
         authorize(context)
 
+        try:
+            utils.validate_integer(id, 'id')
+        except exception.InvalidInput as exc:
+            raise webob.exc.HTTPBadRequest(explanation=exc.format_message())
+
         try:
             agent = objects.Agent(context=context, id=id)
             agent.destroy()
diff --git a/nova/api/openstack/compute/legacy_v2/contrib/agents.py b/nova/api/openstack/compute/legacy_v2/contrib/agents.py
index 296e340fef37..7e8fda2295ca 100644
--- a/nova/api/openstack/compute/legacy_v2/contrib/agents.py
+++ b/nova/api/openstack/compute/legacy_v2/contrib/agents.py
@@ -89,6 +89,7 @@ class AgentController(object):
             raise webob.exc.HTTPBadRequest(explanation=msg)
 
         try:
+            utils.validate_integer(id, 'id')
             utils.check_string_length(url, 'url', max_length=255)
             utils.check_string_length(md5hash, 'md5hash', max_length=255)
             utils.check_string_length(version, 'version', max_length=255)
@@ -102,9 +103,6 @@ class AgentController(object):
             agent.url = url
             agent.md5hash = md5hash
             agent.save()
-        except ValueError as ex:
-            msg = _("Invalid request body: %s") % ex
-            raise webob.exc.HTTPBadRequest(explanation=msg)
         except exception.AgentBuildNotFound as ex:
             raise webob.exc.HTTPNotFound(explanation=ex.format_message())
 
@@ -123,6 +121,11 @@ class AgentController(object):
         # NOTE(alex_xu): back-compatible with db layer hard-code admin
         # permission checks.
         nova_context.require_admin_context(context)
+        try:
+            utils.validate_integer(id, 'id')
+        except exception.InvalidInput as exc:
+            raise webob.exc.HTTPBadRequest(explanation=exc.format_message())
+
         try:
             agent = objects.Agent(context=context, id=id)
             agent.destroy()
diff --git a/nova/tests/unit/api/openstack/compute/test_agents.py b/nova/tests/unit/api/openstack/compute/test_agents.py
index 4f8214014c12..297a895acca3 100644
--- a/nova/tests/unit/api/openstack/compute/test_agents.py
+++ b/nova/tests/unit/api/openstack/compute/test_agents.py
@@ -205,6 +205,10 @@ class AgentsTestV21(test.NoDBTestCase):
             self.assertRaises(webob.exc.HTTPNotFound,
                               self.controller.delete, self.req, 1)
 
+    def test_agents_delete_string_id(self):
+        self.assertRaises(webob.exc.HTTPBadRequest,
+                          self.controller.delete, self.req, 'string_id')
+
     def test_agents_list(self):
         res_dict = self.controller.index(self.req)
         agents_list = [{'hypervisor': 'kvm', 'os': 'win',
@@ -298,6 +302,14 @@ class AgentsTestV21(test.NoDBTestCase):
         self.assertRaises(self.validation_error,
                           self.controller.update, self.req, 1, body=body)
 
+    def test_agents_update_with_string_id(self):
+        body = {'para': {'version': '7.0',
+                'url': 'http://example.com/path/to/resource',
+                'md5hash': 'add6bb58e139be103324d04d82d8f545'}}
+        self.assertRaises(webob.exc.HTTPBadRequest,
+                          self.controller.update, self.req,
+                          'string_id', body=body)
+
     def _test_agents_update_with_invalid_length(self, key):
         body = {'para': {'version': '7.0',
                 'url': 'http://example.com/path/to/resource',