Fix ImportError when litellm optional dependency is not installed

UiPathLiteLLM was imported at the top level of __init__.py, causing an
ImportError for users who don't have the litellm extra installed.
Removed the eager import so the core package works without litellm.

Bumps core version to 1.8.1 to sync with langchain 1.8.1.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: cosminacho

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to `uipath_llm_client` (core package) will be documented in this file.
 
+## [1.8.1] - 2026-04-13
+
+### Fixed
+- Removed top-level import of `UiPathLiteLLM` from `__init__.py` to avoid `ImportError` when the optional `litellm` dependency is not installed
+
 ## [1.8.0] - 2026-04-08
 
 ### Added

packages/uipath_langchain_client/pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 requires-python = ">=3.11"
 dependencies = [
     "langchain>=1.2.15",
-    "uipath-llm-client>=1.8.0",
+    "uipath-llm-client>=1.8.1",
 ]
 
 [project.optional-dependencies]

src/uipath/llm_client/__init__.py

@@ -26,7 +26,6 @@
 """
 
 from uipath.llm_client.__version__ import __version__
-from uipath.llm_client.clients.litellm import UiPathLiteLLM
 from uipath.llm_client.clients.normalized import UiPathNormalizedClient
 from uipath.llm_client.httpx_client import (
     UiPathHttpxAsyncClient,
@@ -62,8 +61,6 @@
     "LLMGatewaySettings",
     # Normalized client
     "UiPathNormalizedClient",
-    # LiteLLM client
-    "UiPathLiteLLM",
     # HTTPX clients
     "UiPathHttpxClient",
     "UiPathHttpxAsyncClient",

src/uipath/llm_client/__version__.py

@@ -1,3 +1,3 @@
 __title__ = "UiPath LLM Client"
 __description__ = "A Python client for interacting with UiPath's LLM services."
-__version__ = "1.8.0"
+__version__ = "1.8.1"