diff --git a/requirements.txt b/requirements.txt
index 3e677ab..70f54d0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 networkx>=1.8
 jsonschema>=2.3.0
 PyYAML>=3.11
+argparse>=1.2.1
diff --git a/setup.cfg b/setup.cfg
index e092588..f168bbf 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,6 +16,10 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.6
 
+[entry_points]
+console_scripts =
+    tasks-validator = tasks_validator.validator:main
+
 [files]
 packages =
     tasks_validator
diff --git a/tasks_validator/graph.py b/tasks_validator/graph.py
new file mode 100644
index 0000000..c92d186
--- /dev/null
+++ b/tasks_validator/graph.py
@@ -0,0 +1,77 @@
+# -*- coding: utf-8 -*-
+#    Copyright 2015 Mirantis, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import networkx as nx
+
+
+class DeploymentGraph(object):
+
+    def __init__(self, tasks):
+        self.tasks = tasks
+        self.graph = self._create_graph()
+
+    def _create_graph(self):
+        """Create graph from tasks
+
+        :return: directed graph
+        """
+        graph = nx.DiGraph()
+        for task in self.tasks:
+            task_id = task['id']
+            graph.add_node(task_id, **task)
+            if 'required_for' in task:
+                for req in task['required_for']:
+                    graph.add_edge(task_id, req)
+            if 'requires' in task:
+                for req in task['requires']:
+                    graph.add_edge(req, task_id)
+
+            if 'groups' in task:
+                for req in task['groups']:
+                    graph.add_edge(task_id, req)
+            if 'tasks' in task:
+                for req in task['tasks']:
+                    graph.add_edge(req, task_id)
+
+        return graph
+
+    def find_cycles(self):
+        """Find cycles in graph.
+
+        :return: list of cycles in graph
+        """
+        cycles = []
+        for cycle in nx.simple_cycles(self.graph):
+            cycles.append(cycle)
+
+        return cycles
+
+    def is_connected(self):
+        """Check if graph is connected.
+
+        :return: bool
+        """
+        return nx.is_weakly_connected(self.graph)
+
+    def find_empty_nodes(self):
+        """Find empty nodes in graph.
+
+        :return: list of empty nodes in graph
+        """
+        empty_nodes = []
+        for node_name, node in self.graph.node.items():
+            if node == {}:
+                empty_nodes.append(node_name)
+        return empty_nodes
diff --git a/tasks_validator/schemas.py b/tasks_validator/schemas.py
new file mode 100644
index 0000000..ba41c3a
--- /dev/null
+++ b/tasks_validator/schemas.py
@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+#    Copyright 2015 Mirantis, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+
+class BaseTasksSchema(object):
+
+    base_task_schema = {
+        '$schema': 'http://json-schema.org/draft-04/schema#',
+        'type': 'object',
+        'required': ['type', 'id'],
+        'properties': {
+            'id': {'type': 'string',
+                   'minLength': 1},
+            'type': {'enum': [],
+                     'type': 'string'},
+            'parameters': {'type': 'object'},
+            'required_for': {'type': 'array'},
+            'requires': {'type': 'array'},
+        }}
+
+    base_tasks_schema = {
+        '$schema': 'http://json-schema.org/draft-04/schema#',
+        'type': 'array',
+        'items': ''}
+
+    types = {'enum': ['puppet', 'shell'],
+             'type': 'string'},
+
+    @property
+    def task_schema(self):
+        self.base_task_schema['properties']['type'] = self.types
+        return self.base_task_schema
+
+    @property
+    def tasks_schema(self):
+        self.base_tasks_schema['items'] = self.task_schema
+        return self.base_tasks_schema
+
+
+class TasksSchema61(BaseTasksSchema):
+
+    types = {'enum': ['puppet', 'shell', 'group', 'stage', 'copy_files',
+                      'sync', 'upload_file'],
+             'type': 'string'}
+
+
+VERSIONS_SCHEMAS_MAP = {
+    "6.1": TasksSchema61,
+    "last": TasksSchema61,
+}
diff --git a/tasks_validator/tests/__init__.py b/tasks_validator/tests/__init__.py
new file mode 100644
index 0000000..1f6e00f
--- /dev/null
+++ b/tasks_validator/tests/__init__.py
@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+#    Copyright 2015 Mirantis, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
diff --git a/tasks_validator/tests/test_graph.py b/tasks_validator/tests/test_graph.py
new file mode 100644
index 0000000..98ecce5
--- /dev/null
+++ b/tasks_validator/tests/test_graph.py
@@ -0,0 +1,66 @@
+# -*- coding: utf-8 -*-
+#    Copyright 2015 Mirantis, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from unittest2.case import TestCase
+
+from tasks_validator import graph
+
+
+class TestGraphs(TestCase):
+
+    def test_connectability(self):
+        tasks = [
+            {'id': 'pre_deployment_start',
+             'type': 'stage'},
+            {'id': 'pre_deployment_end',
+             'type': 'stage',
+             'requires': ['pre_deployment_start']},
+            {'id': 'deploy_start',
+             'type': 'stage'}]
+        tasks_graph = graph.DeploymentGraph(tasks)
+        self.assertFalse(tasks_graph.is_connected())
+
+    def test_cyclic(self):
+        tasks = [
+            {'id': 'pre_deployment_start',
+             'type': 'stage'},
+            {'id': 'pre_deployment_end',
+             'type': 'stage',
+             'requires': ['pre_deployment_start']},
+            {'id': 'deploy_start',
+             'type': 'stage',
+             'requires': ['pre_deployment_end'],
+             'required_for': ['pre_deployment_start']}]
+        tasks_graph = graph.DeploymentGraph(tasks)
+        cycles = tasks_graph.find_cycles()
+        self.assertEqual(len(cycles), 1)
+        self.assertItemsEqual(cycles[0], ['deploy_start',
+                                          'pre_deployment_start',
+                                          'pre_deployment_end'])
+
+    def test_empty_nodes(self):
+        tasks = [
+            {'id': 'pre_deployment_start',
+             'type': 'stage',
+             'requires': ['empty_node']},
+            {'id': 'pre_deployment_end',
+             'type': 'stage',
+             'requires': ['pre_deployment_start']},
+            {'id': 'deploy_start',
+             'type': 'stage',
+             'requires': ['empty_node_2']}]
+        tasks_graph = graph.DeploymentGraph(tasks)
+        self.assertItemsEqual(tasks_graph.find_empty_nodes(), ['empty_node',
+                                                               'empty_node_2'])
diff --git a/tasks_validator/tests/test_validator.py b/tasks_validator/tests/test_validator.py
new file mode 100644
index 0000000..4c96d84
--- /dev/null
+++ b/tasks_validator/tests/test_validator.py
@@ -0,0 +1,124 @@
+# -*- coding: utf-8 -*-
+
+#    Copyright 2015 Mirantis, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import copy
+import jsonschema
+import mock
+
+from unittest2.case import TestCase
+
+from tasks_validator import validator
+
+
+TASKS = [
+    {'id': 'pre_deployment_start',
+     'type': 'stage'},
+    {'id': 'pre_deployment_end',
+     'requires': ['pre_deployment_start'],
+     'type': 'stage'},
+    {'id': 'deploy_start',
+     'requires': ['pre_deployment_end'],
+     'type': 'stage'},
+    {'id': 'deploy_end',
+     'requires': ['deploy_start'],
+     'type': 'stage'},
+    {'id': 'post_deployment_start',
+     'requires': ['deploy_end'],
+     'type': 'stage'},
+    {'id': 'post_deployment_end',
+     'requires': ['post_deployment_start'],
+     'type': 'stage'}]
+
+
+class TestValidator61(TestCase):
+
+    def setUp(self):
+        self.tasks = copy.deepcopy(TASKS)
+
+    def test_validate_schema(self):
+        valid_tasks = validator.TasksValidator(self.tasks, "6.1")
+        valid_tasks.validate_schema()
+
+    def test_wrong_schema(self):
+        self.tasks.append({'id': 'wrong',
+                           'type': 'non existing'})
+        valid_tasks = validator.TasksValidator(self.tasks, "6.1")
+        self.assertRaises(jsonschema.ValidationError,
+                          valid_tasks.validate_schema)
+
+    def test_empty_id_schema(self):
+        self.tasks.append({'id': '',
+                           'type': 'stage'})
+        valid_tasks = validator.TasksValidator(self.tasks, "6.1")
+        self.assertRaises(jsonschema.ValidationError,
+                          valid_tasks.validate_schema)
+
+    def test_validate_graph(self):
+        valid_tasks = validator.TasksValidator(self.tasks, "6.1")
+        valid_tasks.validate_graph()
+
+    def test_validate_cyclic_graph(self):
+        self.tasks.append({'id': 'post_deployment_part',
+                           'type': 'stage',
+                           'requires': ['post_deployment_start'],
+                           'required_for': ['pre_deployment_start']})
+        valid_tasks = validator.TasksValidator(self.tasks, "6.1")
+        self.assertRaises(ValueError,
+                          valid_tasks.validate_graph)
+
+    def test_validate_not_connected_graph(self):
+        self.tasks.append({'id': 'post_deployment_part',
+                           'type': 'stage'})
+        valid_tasks = validator.TasksValidator(self.tasks, "6.1")
+        self.assertRaises(ValueError,
+                          valid_tasks.validate_graph)
+
+    def test_validate_duplicated_tasks(self):
+        self.tasks.append({'id': 'pre_deployment_start',
+                           'type': 'stage'})
+        valid_tasks = validator.TasksValidator(self.tasks, "6.1")
+        self.assertRaises(ValueError,
+                          valid_tasks.validate_unique_tasks)
+
+    def test_validate_empty_nodes(self):
+        self.tasks.append({'id': 'some_task',
+                           'type': 'stage',
+                           'requires': ['empty_node',
+                                        'post_deployment_start']})
+        valid_tasks = validator.TasksValidator(self.tasks, "6.1")
+        self.assertRaises(ValueError,
+                          valid_tasks.validate_graph)
+
+
+class TestValidatorClient(TestCase):
+
+    def test_no_dir(self):
+        args = ['script/name']
+        try:
+            validator.main(args)
+        except SystemExit as pars_error:
+            pass
+        self.assertEqual(pars_error[0], 2)
+
+    @mock.patch('tasks_validator.validator.get_tasks')
+    @mock.patch('tasks_validator.validator.TasksValidator')
+    def test_passing_params(self, mock_validator, mock_file):
+        mock_file.return_value = TASKS
+        args = ['/usr/local/bin/tasks-validator', '-d',
+                './path', '-v', '6.1']
+        validator.main(args)
+        mock_file.called_with('./path')
+        mock_validator.assert_called_with(TASKS, '6.1')
diff --git a/tasks_validator/validator.py b/tasks_validator/validator.py
new file mode 100644
index 0000000..4967ed3
--- /dev/null
+++ b/tasks_validator/validator.py
@@ -0,0 +1,123 @@
+# -*- coding: utf-8 -*-
+
+#    Copyright 2015 Mirantis, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from __future__ import print_function
+
+import argparse
+from fnmatch import fnmatch
+import jsonschema
+import logging
+import os
+import sys
+import yaml
+
+from tasks_validator import graph
+from tasks_validator.schemas import VERSIONS_SCHEMAS_MAP
+
+logging.basicConfig(level=logging.ERROR)
+LOG = logging.getLogger(__name__)
+
+
+class TasksValidator(object):
+
+    def __init__(self, tasks, version):
+        self.version = version
+        self.tasks = tasks
+        self.graph = graph.DeploymentGraph(tasks)
+
+    def validate_schema(self):
+        '''Validate tasks schema
+
+        :raise: jsonschema.ValidationError
+        '''
+        checker = jsonschema.FormatChecker()
+        schema = VERSIONS_SCHEMAS_MAP.get(self.version)().tasks_schema
+        jsonschema.validate(self.tasks, schema, format_checker=checker)
+
+    def validate_unique_tasks(self):
+        '''Check if all tasks have unique ids
+
+        :raise: ValueError when ids are duplicated
+        '''
+        if not len(self.tasks) == len(set(task['id'] for task in self.tasks)):
+            raise ValueError("All tasks should have unique id")
+
+    def validate_graph(self):
+        '''Validate graph if is executable completely by fuel nailgun
+
+        :raise: ValueEror when one of requirements is not satisfied
+        '''
+        msgs = []
+
+        # deployment graph should be without cycles
+        cycles = self.graph.find_cycles()
+        if len(cycles):
+            msgs.append('Graph is not acyclic. Cycles: {0}'.format(cycles))
+
+        # graph should be connected to execute all tasks
+        if not self.graph.is_connected():
+            msgs.append('Graph is not connected.')
+
+        # deployment graph should have filled all nodes
+        empty_nodes = self.graph.find_empty_nodes()
+        if len(empty_nodes):
+            msgs.append('Graph have empty nodes: {0}'.format(empty_nodes))
+
+        if msgs:
+            raise ValueError('Graph validation fail: {0}'.format(msgs))
+
+
+def get_files(base_dir, file_pattern='*tasks.yaml'):
+    for root, _dirs, files in os.walk(base_dir):
+        for file_name in files:
+            if fnmatch(file_name, file_pattern):
+                yield os.path.join(root, file_name)
+
+
+def get_tasks(base_dir):
+    tasks = []
+    for file_path in get_files(base_dir):
+        with open(file_path) as f:
+            LOG.debug('Reading tasks from file %s', file_path)
+            tasks.extend(yaml.load(f.read()))
+    return tasks
+
+
+def main(args=sys.argv):
+    parser = argparse.ArgumentParser(
+        description='''Validator of tasks, gather all yaml files with name
+        contains tasks and read and validate tasks from them''')
+    parser.add_argument('-d', '--dir', dest='dir', required=True,
+                        help='directory where tasks are localised')
+    parser.add_argument('-v', '--version', dest='ver', default='last',
+                        metavar='VERSION', help='version of fuel for which '
+                        'tasks should be validated')
+    parser.add_argument("--debug", dest="debug", action="store_true",
+                        default=False, help="Enable debug mode")
+    args, _ = parser.parse_known_args(args)
+
+    tasks = get_tasks(args.dir)
+    if args.debug:
+        LOG.setLevel(logging.DEBUG)
+
+    if tasks:
+        t_validator = TasksValidator(tasks, args.ver)
+        t_validator.validate_schema()
+        t_validator.validate_unique_tasks()
+        t_validator.validate_graph()
+    else:
+        print("No tasks in the provided directory %s" % args.dir)
+        sys.exit(1)
diff --git a/test-requirements.txt b/test-requirements.txt
index e447160..a06846d 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1 +1,3 @@
 pytest>=2.6.4
+unittest2>=0.5.1
+mock==1.0
\ No newline at end of file