diff --git a/libertai_agents/agents.py b/libertai_agents/agents.py
index 1343b44..6445d0f 100644
--- a/libertai_agents/agents.py
+++ b/libertai_agents/agents.py
@@ -1,3 +1,5 @@
+from typing import Callable
+
 import aiohttp
 from aiohttp import ClientSession
 
@@ -9,9 +11,9 @@
 class ChatAgent:
     model: Model
     system_prompt: str
-    tools: list
+    tools: list[Callable]
 
-    def __init__(self, model: Model, system_prompt: str, tools: list | None = None):
+    def __init__(self, model: Model, system_prompt: str, tools: list[Callable] | None = None):
         if tools is None:
             tools = []
 
@@ -36,33 +38,35 @@ async def generate_answer(self, messages: list[Message]) -> str:
             if len(tool_calls) == 0:
                 return response
             messages.append(self.__create_tool_calls_message(tool_calls))
-            tool_messages = self.execute_tool_calls(tool_calls)
+            tool_messages = self.__execute_tool_calls(tool_calls)
             return await self.generate_answer(messages + tool_messages)
 
     async def __call_model(self, session: ClientSession, prompt: str):
         params = LlamaCppParams(prompt=prompt)
 
         async with session.post(self.model.vm_url, json=params.model_dump()) as response:
+            # TODO: handle errors and retries
             if response.status == 200:
                 response_data = await response.json()
                 return response_data["content"]
 
-    def execute_tool_calls(self, tool_calls: list[ToolCallFunction]) -> list[Message]:
+    def __execute_tool_calls(self, tool_calls: list[ToolCallFunction]) -> list[Message]:
         # TODO: support async function calls
         messages = []
         for call in tool_calls:
-            function_to_call = find(lambda x: x.__name__ == call.name, self.tools)
+            function_name = call.name
+            function_to_call = find(lambda x: x.__name__ == function_name, self.tools)
             if function_to_call is None:
                 # TODO: handle error
                 continue
             function_response = function_to_call(*call.arguments.values())
-            messages.append(Message(role=MessageRoleEnum.tool, name=call.name, content=str(function_response)))
+            messages.append(Message(role=MessageRoleEnum.tool, name=function_name, content=str(function_response)))
         return messages
 
-    @staticmethod
-    def __create_tool_calls_message(tool_calls: list[ToolCallFunction]) -> Message:
+    def __create_tool_calls_message(self, tool_calls: list[ToolCallFunction]) -> Message:
         return Message(role=MessageRoleEnum.assistant,
                        tool_calls=[MessageToolCall(type="function",
+                                                   id=self.model.generate_tool_call_id(),
                                                    function=ToolCallFunction(name=call.name,
                                                                              arguments=call.arguments)) for
                                    call in
diff --git a/libertai_agents/interfaces.py b/libertai_agents/interfaces.py
index a39a0ae..0f6e641 100644
--- a/libertai_agents/interfaces.py
+++ b/libertai_agents/interfaces.py
@@ -18,6 +18,7 @@ class ToolCallFunction(BaseModel):
 
 class MessageToolCall(BaseModel):
     type: str
+    id: Optional[str] = None
     function: ToolCallFunction
 
 
@@ -25,6 +26,7 @@ class Message(BaseModel):
     role: MessageRoleEnum
     name: Optional[str] = None
     content: Optional[str] = None
+    tool_call_id: Optional[str] = None
     tool_calls: Optional[list[MessageToolCall]] = None
 
 
diff --git a/libertai_agents/models/__init__.py b/libertai_agents/models/__init__.py
new file mode 100644
index 0000000..7d5547c
--- /dev/null
+++ b/libertai_agents/models/__init__.py
@@ -0,0 +1,2 @@
+from .base import Model
+from .models import get_model
diff --git a/libertai_agents/models.py b/libertai_agents/models/base.py
similarity index 64%
rename from libertai_agents/models.py
rename to libertai_agents/models/base.py
index 703cde5..7527ea0 100644
--- a/libertai_agents/models.py
+++ b/libertai_agents/models/base.py
@@ -1,12 +1,11 @@
-import json
-import re
+from abc import ABC, abstractmethod
 
-from transformers import AutoTokenizer, PreTrainedTokenizerFast
+from transformers import PreTrainedTokenizerFast, AutoTokenizer
 
 from libertai_agents.interfaces import Message, MessageRoleEnum, ToolCallFunction
 
 
-class Model:
+class Model(ABC):
     tokenizer: PreTrainedTokenizerFast
     vm_url: str
 
@@ -21,11 +20,11 @@ def generate_prompt(self, messages: list[Message], system_prompt: str, tools: li
         return self.tokenizer.apply_chat_template(conversation=raw_messages, tools=tools, tokenize=False,
                                                   add_generation_prompt=True)
 
+    @abstractmethod
+    def generate_tool_call_id(self) -> str | None:
+        pass
+
     @staticmethod
+    @abstractmethod
     def extract_tool_calls_from_response(response: str) -> list[ToolCallFunction]:
-        tool_calls = re.findall("^<tool_call>\s*(.*)\s*</tool_call>$", response)
-        return [ToolCallFunction(**json.loads(call)) for call in tool_calls]
-
-
-Hermes2Pro = Model(model_id="NousResearch/Hermes-2-Pro-Llama-3-8B",
-                   vm_url='https://curated.aleph.cloud/vm/84df52ac4466d121ef3bb409bb14f315de7be4ce600e8948d71df6485aa5bcc3/completion')
+        pass
diff --git a/libertai_agents/models/hermes.py b/libertai_agents/models/hermes.py
new file mode 100644
index 0000000..f6aa1c0
--- /dev/null
+++ b/libertai_agents/models/hermes.py
@@ -0,0 +1,23 @@
+import json
+import re
+
+from transformers import PreTrainedTokenizerFast
+
+from libertai_agents.interfaces import ToolCallFunction
+from libertai_agents.models.base import Model
+
+
+class HermesModel(Model):
+    tokenizer: PreTrainedTokenizerFast
+    vm_url: str
+
+    def __init__(self, model_id: str, vm_url: str):
+        super().__init__(model_id, vm_url)
+
+    @staticmethod
+    def extract_tool_calls_from_response(response: str) -> list[ToolCallFunction]:
+        tool_calls = re.findall("<tool_call>\s*(.*)\s*</tool_call>", response)
+        return [ToolCallFunction(**json.loads(call)) for call in tool_calls]
+
+    def generate_tool_call_id(self) -> str | None:
+        return None
diff --git a/libertai_agents/models/mistral.py b/libertai_agents/models/mistral.py
new file mode 100644
index 0000000..bc73017
--- /dev/null
+++ b/libertai_agents/models/mistral.py
@@ -0,0 +1,23 @@
+import json
+import re
+
+from transformers import PreTrainedTokenizerFast
+
+from libertai_agents.interfaces import ToolCallFunction
+from libertai_agents.models.base import Model
+
+
+class MistralModel(Model):
+    tokenizer: PreTrainedTokenizerFast
+    vm_url: str
+
+    def __init__(self, model_id: str, vm_url: str):
+        super().__init__(model_id, vm_url)
+
+    @staticmethod
+    def extract_tool_calls_from_response(response: str) -> list[ToolCallFunction]:
+        tool_calls = re.findall("<tool_call>\s*(.*)\s*</tool_call>", response)
+        return [ToolCallFunction(**json.loads(call)) for call in tool_calls]
+
+    def generate_tool_call_id(self) -> str | None:
+        return None
diff --git a/libertai_agents/models/models.py b/libertai_agents/models/models.py
new file mode 100644
index 0000000..66763a8
--- /dev/null
+++ b/libertai_agents/models/models.py
@@ -0,0 +1,43 @@
+import typing
+
+from huggingface_hub import login
+from pydantic import BaseModel
+
+from libertai_agents.models.base import Model
+from libertai_agents.models.hermes import HermesModel
+from libertai_agents.models.mistral import MistralModel
+
+
+class ModelConfiguration(BaseModel):
+    vm_url: str
+    constructor: typing.Type[Model]
+
+
+ModelId = typing.Literal[
+    "NousResearch/Hermes-2-Pro-Llama-3-8B",
+    "NousResearch/Hermes-3-Llama-3.1-8B",
+    "mistralai/Mistral-Nemo-Instruct-2407"
+]
+MODEL_IDS: list[ModelId] = list(typing.get_args(ModelId))
+
+MODELS_CONFIG: dict[ModelId, ModelConfiguration] = {
+    "NousResearch/Hermes-2-Pro-Llama-3-8B": ModelConfiguration(
+        vm_url="https://curated.aleph.cloud/vm/84df52ac4466d121ef3bb409bb14f315de7be4ce600e8948d71df6485aa5bcc3/completion",
+        constructor=HermesModel),
+    "NousResearch/Hermes-3-Llama-3.1-8B": ModelConfiguration(vm_url="http://localhost:8080/completion",
+                                                             constructor=HermesModel),
+    "mistralai/Mistral-Nemo-Instruct-2407": ModelConfiguration(vm_url="http://localhost:8080/completion",
+                                                               constructor=MistralModel)
+}
+
+
+def get_model(model_id: ModelId, hf_token: str | None = None) -> Model:
+    model_configuration = MODELS_CONFIG.get(model_id)
+
+    if model_configuration is None:
+        raise ValueError(f'model_id must be one of {MODEL_IDS}')
+
+    if hf_token is not None:
+        login(hf_token)
+
+    return model_configuration.constructor(model_id=model_id, **model_configuration.model_dump(exclude={'constructor'}))
diff --git a/main.py b/main.py
index fef78bb..8946fe1 100644
--- a/main.py
+++ b/main.py
@@ -2,14 +2,16 @@
 
 from libertai_agents.agents import ChatAgent
 from libertai_agents.interfaces import Message, MessageRoleEnum
-from libertai_agents.models import Hermes2Pro
+from libertai_agents.models import get_model
 from libertai_agents.tools import get_current_temperature
 
 
 async def start():
-    agent = ChatAgent(model=Hermes2Pro, system_prompt="You are a helpful assistant", tools=[get_current_temperature])
+    agent = ChatAgent(model=get_model("mistralai/Mistral-Nemo-Instruct-2407"),
+                      system_prompt="You are a helpful assistant",
+                      tools=[get_current_temperature])
     response = await agent.generate_answer(
-        [Message(role=MessageRoleEnum.user, content="What's the temperature in Paris ?")])
+        [Message(role=MessageRoleEnum.user, content="What's the temperature in Paris and in Lyon ?")])
     print(response)