diff --git a/custom_components/ha_text_ai/const.py b/custom_components/ha_text_ai/const.py
index de2580a..1c660b3 100644
--- a/custom_components/ha_text_ai/const.py
+++ b/custom_components/ha_text_ai/const.py
@@ -1,6 +1,8 @@
 """Constants for the HA text AI integration."""
 from typing import Final
+import voluptuous as vol
 from homeassistant.const import Platform
+from homeassistant.helpers import config_validation as cv
 
 # Domain and platforms
 DOMAIN: Final = "ha_text_ai"
@@ -23,7 +25,7 @@ SUPPORTED_MODELS: Final = [
     "claude-3.5-sonnet",
     "claude-3-haiku",
     "anthropic/claude-3-5-haiku",
-    "anthropic/claude-3.5-sonnet",   
+    "anthropic/claude-3.5-sonnet",
 ]
 
 # Default values
@@ -188,3 +190,41 @@ SCHEMA_LIMIT: Final = "limit"
 EVENT_RESPONSE_RECEIVED: Final = f"{DOMAIN}_response_received"
 EVENT_ERROR_OCCURRED: Final = f"{DOMAIN}_error_occurred"
 EVENT_STATE_CHANGED: Final = f"{DOMAIN}_state_changed"
+
+# Service schema constants
+SERVICE_SCHEMA_ASK_QUESTION = {
+    vol.Required("question"): cv.string,
+    vol.Optional("system_prompt"): cv.string,
+    vol.Optional("model"): vol.In(SUPPORTED_MODELS),
+    vol.Optional("temperature"): vol.All(
+        vol.Coerce(float),
+        vol.Range(min=MIN_TEMPERATURE, max=MAX_TEMPERATURE)
+    ),
+    vol.Optional("max_tokens"): vol.All(
+        vol.Coerce(int),
+        vol.Range(min=MIN_MAX_TOKENS, max=MAX_MAX_TOKENS)
+    ),
+    vol.Optional("priority"): cv.boolean,
+}
+
+SERVICE_SCHEMA_GET_HISTORY = {
+    vol.Optional("limit", default=10): vol.All(
+        vol.Coerce(int),
+        vol.Range(min=1, max=100)
+    ),
+    vol.Optional("filter_model"): vol.In(SUPPORTED_MODELS),
+    vol.Optional("start_date"): cv.datetime,
+    vol.Optional("include_metadata"): cv.boolean,
+}
+
+SERVICE_SCHEMA_SET_SYSTEM_PROMPT = {
+    vol.Required("prompt"): cv.string,
+}
+
+# VSE GPT specific constants
+VSE_GPT_ENDPOINT = "https://api.vsegpt.ru"
+VSE_GPT_API_VERSION = "2023-06-01"
+VSE_GPT_MODELS = [
+    "anthropic/claude-3-5-haiku",
+    "anthropic/claude-3.5-sonnet",
+]
diff --git a/custom_components/ha_text_ai/coordinator.py b/custom_components/ha_text_ai/coordinator.py
index 79cdf88..d7fd6bc 100644
--- a/custom_components/ha_text_ai/coordinator.py
+++ b/custom_components/ha_text_ai/coordinator.py
@@ -12,7 +12,6 @@ from homeassistant.helpers import aiohttp_client
 from openai import AsyncOpenAI, APIError, AuthenticationError, RateLimitError
 from anthropic import AsyncAnthropic
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers import aiohttp_client
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 from homeassistant.util import dt as dt_util
 import async_timeout
@@ -30,44 +29,6 @@ _LOGGER = logging.getLogger(__name__)
 
 class HATextAICoordinator(DataUpdateCoordinator):
     """Class to manage fetching data from the API."""
-    def __init__(
-        self,
-        hass: HomeAssistant,
-        api_key: str,
-        endpoint: str,
-        model: str,
-        temperature: float,
-        max_tokens: int,
-        request_interval: float,
-        session: Optional[Any] = None,
-        is_anthropic: bool = False,
-    ) -> None:
-        """Initialize coordinator."""
-        super().__init__(
-            hass,
-            _LOGGER,
-            name=DOMAIN,
-            update_interval=timedelta(seconds=request_interval),
-        )
-    def __init__(
-        self,
-        hass: HomeAssistant,
-        api_key: str,
-        endpoint: str,
-        model: str,
-        temperature: float,
-        max_tokens: int,
-        request_interval: float,
-        session: Optional[Any] = None,
-        is_anthropic: bool = False,
-    ) -> None:
-        """Initialize coordinator."""
-        super().__init__(
-            hass,
-            _LOGGER,
-            name=DOMAIN,
-            update_interval=timedelta(seconds=request_interval),
-        )
     def __init__(
         self,
         hass: HomeAssistant,
@@ -117,8 +78,18 @@ class HATextAICoordinator(DataUpdateCoordinator):
         self._last_request_time = 0
         self._is_anthropic = is_anthropic
         self._session = session or aiohttp_client.async_get_clientsession(hass)
+        self.client = None  # Initialize client as None
 
-        self._init_client()
+    async def async_initialize(self) -> None:
+        """Initialize coordinator."""
+        try:
+            await self._init_client()
+            self._is_ready = True
+            await self.async_refresh()
+        except Exception as e:
+            _LOGGER.error("Failed to initialize coordinator: %s", str(e))
+            self._is_ready = False
+            self._endpoint_status = "error"
 
     async def _create_ssl_context(self):
         """Create an async SSL context."""