Fix/byom not working

.claude/CLAUDE.md

@@ -95,12 +95,23 @@ Follow the existing format — newest version first, grouped by date:
 
 ---
 
+## Pre-commit / Pre-PR Checklist
+
+Before every commit and before opening a PR, always run:
+
+```bash
+ruff check && ruff format --check && pytest tests
+```
+
+All three must pass. Fix any lint, format, or test failures before committing. This applies when working as an AI assistant too — run the checks, fix failures, then commit.
+
+---
+
 ## PR Guidelines
 
 ### Before Opening a PR
 
-- Run `ruff check`, `ruff format --check`, and `pyright` — all must pass.
-- Run `pytest tests` — all tests must pass.
+- Run the pre-commit checklist above — all must pass.
 - Apply versioning rules above: the CI workflow (`ci_change_version.yml`) enforces that any changed source files must have a corresponding version bump and changelog entry.
 
 ### PR Scope

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to `uipath_llm_client` (core package) will be documented in this file.
 
+## [1.5.9] - 2026-03-26
+
+### Fix
+- Use `availableOperationCodes` field (instead of `operationCodes`) when validating BYOM operation codes
+
 ## [1.5.8] - 2026-03-26
 
 ### Fix

packages/uipath_langchain_client/CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to `uipath_langchain_client` will be documented in this file.
 
+## [1.5.9] - 2026-03-26
+
+### Fix
+- Remove `fix_host_header` event hooks from `UiPathChatOpenAI`; host header management is handled by the underlying httpx client
+
 ## [1.5.8] - 2026-03-26
 
 ### Fix

packages/uipath_langchain_client/pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 requires-python = ">=3.11"
 dependencies = [
     "langchain>=1.2.13",
-    "uipath-llm-client>=1.5.8",
+    "uipath-llm-client>=1.5.9",
 ]
 
 [project.optional-dependencies]

packages/uipath_langchain_client/src/uipath_langchain_client/__version__.py

@@ -1,3 +1,3 @@
 __title__ = "UiPath LangChain Client"
 __description__ = "A Python client for interacting with UiPath's LLM services via LangChain."
-__version__ = "1.5.8"
+__version__ = "1.5.9"

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__ = "1.5.8"
+__version__ = "1.5.9"

src/uipath/llm_client/settings/llmgateway/settings.py

@@ -117,7 +117,7 @@ def get_available_models(self) -> list[dict[str, Any]]:
     @override
     def validate_byo_model(self, model_info: dict[str, Any]) -> None:
         byom_details = model_info.get("byomDetails", {})
-        operation_codes = byom_details.get("operationCodes", [])
+        operation_codes = byom_details.get("availableOperationCodes", [])
         if self.operation_code and self.operation_code not in operation_codes:
             raise ValueError(
                 f"The operation code {self.operation_code} is not allowed for the model {model_info['modelName']}"

tests/core/test_base_client.py

@@ -1933,7 +1933,7 @@ def test_valid_operation_code(self, llmgw_env_vars):
             settings.operation_code = "code1"
             model_info = {
                 "modelName": "custom-model",
-                "byomDetails": {"operationCodes": ["code1", "code2"]},
+                "byomDetails": {"availableOperationCodes": ["code1", "code2"]},
             }
             settings.validate_byo_model(model_info)  # Should not raise
 
@@ -1943,7 +1943,7 @@ def test_invalid_operation_code_raises(self, llmgw_env_vars):
             settings.operation_code = "invalid-code"
             model_info = {
                 "modelName": "custom-model",
-                "byomDetails": {"operationCodes": ["code1", "code2"]},
+                "byomDetails": {"availableOperationCodes": ["code1", "code2"]},
             }
             with pytest.raises(ValueError, match="operation code"):
                 settings.validate_byo_model(model_info)
@@ -1954,7 +1954,7 @@ def test_auto_picks_first_operation_code(self, llmgw_env_vars):
             settings.operation_code = None
             model_info = {
                 "modelName": "custom-model",
-                "byomDetails": {"operationCodes": ["auto-code"]},
+                "byomDetails": {"availableOperationCodes": ["auto-code"]},
             }
             settings.validate_byo_model(model_info)
             assert settings.operation_code == "auto-code"
@@ -1965,7 +1965,7 @@ def test_auto_picks_first_with_warning_for_multiple(self, llmgw_env_vars):
             settings.operation_code = None
             model_info = {
                 "modelName": "custom-model",
-                "byomDetails": {"operationCodes": ["code1", "code2"]},
+                "byomDetails": {"availableOperationCodes": ["code1", "code2"]},
             }
             with patch("uipath.llm_client.settings.llmgateway.settings.logging") as mock_logging:
                 settings.validate_byo_model(model_info)
@@ -1978,7 +1978,7 @@ def test_no_operation_codes_no_change(self, llmgw_env_vars):
             settings.operation_code = None
             model_info = {
                 "modelName": "custom-model",
-                "byomDetails": {"operationCodes": []},
+                "byomDetails": {"availableOperationCodes": []},
             }
             settings.validate_byo_model(model_info)
             assert settings.operation_code is None