fix: make max_tokens default to None and bump version to 0.10.5

Per review feedback: max_tokens=1000 was too prescriptive — leave it unset
by default so the underlying client picks the right limit per model.
temperature=0.0 and max_retries=3 defaults retained.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cosminacho

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "uipath-langchain"
-version = "0.10.4"
+version = "0.10.5"
 description = "Python SDK that enables developers to build and deploy LangGraph agents to the UiPath Cloud Platform"
 readme = { file = "README.md", content-type = "text/markdown" }
 requires-python = ">=3.11"

src/uipath_langchain/chat/chat_model_factory.py

@@ -25,7 +25,6 @@
 
 _UNSET: Final[Any] = object()
 DEFAULT_TIMEOUT_SECONDS: Final[float] = 300.0
-DEFAULT_MAX_TOKENS: Final[int] = 1000
 DEFAULT_TEMPERATURE: Final[float] = 0.0
 DEFAULT_MAX_RETRIES: Final[int] = 3
 
@@ -40,7 +39,7 @@ def get_chat_model(
     api_flavor: ApiFlavor | str | None = None,
     custom_class: type[UiPathBaseChatModel] | None = None,
     temperature: float | None = DEFAULT_TEMPERATURE,
-    max_tokens: int | None = DEFAULT_MAX_TOKENS,
+    max_tokens: int | None = None,
     timeout: float | None = DEFAULT_TIMEOUT_SECONDS,
     max_retries: int | None = DEFAULT_MAX_RETRIES,
     callbacks: Callbacks = _UNSET,
@@ -63,9 +62,8 @@ def get_chat_model(
             instead of the auto-detected one.
         temperature: Sampling temperature. Defaults to 0.0. Pass ``None`` to
             omit the parameter when the underlying client supports it.
-        max_tokens: Maximum output tokens. Defaults to 1000 to match the
-            historical default from ``UiPathRequestMixin``. Pass ``None`` to
-            omit the limit when the underlying client supports it.
+        max_tokens: Maximum output tokens. Defaults to ``None`` (unset), which
+            lets the underlying client apply its own default.
         timeout: Request timeout in seconds. Defaults to 300 seconds.
         max_retries: Max retry count. Defaults to 3.
         callbacks: LangChain callbacks (handlers or a manager) attached to the
@@ -138,7 +136,7 @@ def _legacy_chat_model(
     return _legacy_get_chat_model(
         model,
         temperature if temperature is not _UNSET and temperature is not None else 0.0,
-        max_tokens if max_tokens is not _UNSET and max_tokens is not None else DEFAULT_MAX_TOKENS,
+        max_tokens if max_tokens is not _UNSET and max_tokens is not None else 0,
         agenthub_config,
         byo_connection_id,
         **kwargs,