docstrings `core` update (#14871)

Added missed docstrings

libs/core/langchain_core/beta/runnables/context.py

@@ -128,6 +128,15 @@ def aconfig_with_context(
     config: RunnableConfig,
     steps: List[Runnable],
 ) -> RunnableConfig:
+    """Asynchronously patch a runnable config with context getters and setters.
+
+    Args:
+        config: The runnable config.
+        steps: The runnable steps.
+
+    Returns:
+        The patched runnable config.
+    """
     return _config_with_context(config, steps, _asetter, _agetter, asyncio.Event)
 
 
@@ -135,10 +144,21 @@ def config_with_context(
     config: RunnableConfig,
     steps: List[Runnable],
 ) -> RunnableConfig:
+    """Patch a runnable config with context getters and setters.
+
+    Args:
+        config: The runnable config.
+        steps: The runnable steps.
+
+    Returns:
+        The patched runnable config.
+    """
     return _config_with_context(config, steps, _setter, _getter, threading.Event)
 
 
 class ContextGet(RunnableSerializable):
+    """Get a context value."""
+
     prefix: str = ""
 
     key: Union[str, List[str]]
@@ -197,6 +217,8 @@ def _coerce_set_value(value: SetValue) -> Runnable[Input, Output]:
 
 
 class ContextSet(RunnableSerializable):
+    """Set a context value."""
+
     prefix: str = ""
 
     keys: Mapping[str, Optional[Runnable]]
@@ -276,8 +298,18 @@ class ContextSet(RunnableSerializable):
 
 
 class Context:
+    """Context for a runnable."""
+
     @staticmethod
     def create_scope(scope: str, /) -> "PrefixContext":
+        """Create a context scope.
+
+        Args:
+            scope: The scope.
+
+        Returns:
+            The context scope.
+        """
         return PrefixContext(prefix=scope)
 
     @staticmethod
@@ -295,6 +327,8 @@ class Context:
 
 
 class PrefixContext:
+    """Context for a runnable with a prefix."""
+
     prefix: str = ""
 
     def __init__(self, prefix: str = ""):

libs/core/langchain_core/language_models/chat_models.py

@@ -57,6 +57,8 @@ def _get_verbosity() -> bool:
 
 
 def generate_from_stream(stream: Iterator[ChatGenerationChunk]) -> ChatResult:
+    """Generate from a stream."""
+
     generation: Optional[ChatGenerationChunk] = None
     for chunk in stream:
         if generation is None:
@@ -77,6 +79,8 @@ def generate_from_stream(stream: Iterator[ChatGenerationChunk]) -> ChatResult:
 async def agenerate_from_stream(
     stream: AsyncIterator[ChatGenerationChunk],
 ) -> ChatResult:
+    """Async generate from a stream."""
+
     generation: Optional[ChatGenerationChunk] = None
     async for chunk in stream:
         if generation is None:

libs/core/langchain_core/load/serializable.py

@@ -32,6 +32,16 @@ class SerializedNotImplemented(BaseSerialized):
 
 
 def try_neq_default(value: Any, key: str, model: BaseModel) -> bool:
+    """Try to determine if a value is different from the default.
+
+    Args:
+        value: The value.
+        key: The key.
+        model: The model.
+
+    Returns:
+        Whether the value is different from the default.
+    """
     try:
         return model.__fields__[key].get_default() != value
     except Exception:

libs/core/langchain_core/messages/base.py

@@ -47,6 +47,15 @@ def merge_content(
     first_content: Union[str, List[Union[str, Dict]]],
     second_content: Union[str, List[Union[str, Dict]]],
 ) -> Union[str, List[Union[str, Dict]]]:
+    """Merge two message contents.
+
+    Args:
+        first_content: The first content.
+        second_content: The second content.
+
+    Returns:
+        The merged content.
+    """
     # If first chunk is a string
     if isinstance(first_content, str):
         # If the second chunk is also a string, then merge them naively
@@ -146,6 +155,14 @@ class BaseMessageChunk(BaseMessage):
 
 
 def message_to_dict(message: BaseMessage) -> dict:
+    """Convert a Message to a dictionary.
+
+    Args:
+        message: Message to convert.
+
+    Returns:
+        Message as a dict.
+    """
     return {"type": message.type, "data": message.dict()}
 
 

libs/core/langchain_core/runnables/configurable.py

@@ -422,6 +422,18 @@ def _strremoveprefix(s: str, prefix: str) -> str:
 def prefix_config_spec(
     spec: ConfigurableFieldSpec, prefix: str
 ) -> ConfigurableFieldSpec:
+    """Prefix the id of a ConfigurableFieldSpec.
+
+    This is useful when a RunnableConfigurableAlternatives is used as a
+    ConfigurableField of another RunnableConfigurableAlternatives.
+
+    Args:
+        spec: The ConfigurableFieldSpec to prefix.
+        prefix: The prefix to add.
+
+    Returns:
+
+    """
     return (
         ConfigurableFieldSpec(
             id=f"{prefix}/{spec.id}",

libs/core/langchain_core/tracers/context.py

@@ -205,6 +205,19 @@ def register_configure_hook(
     handle_class: Optional[Type[BaseCallbackHandler]] = None,
     env_var: Optional[str] = None,
 ) -> None:
+    """Register a configure hook.
+
+    Args:
+        context_var (ContextVar[Optional[Any]]): The context variable.
+        inheritable (bool): Whether the context variable is inheritable.
+        handle_class (Optional[Type[BaseCallbackHandler]], optional):
+          The callback handler class. Defaults to None.
+        env_var (Optional[str], optional): The environment variable. Defaults to None.
+
+    Raises:
+        ValueError: If env_var is set, handle_class must also be set
+          to a non-None value.
+    """
     if env_var is not None and handle_class is None:
         raise ValueError(
             "If env_var is set, handle_class must also be set to a non-None value."

libs/core/langchain_core/tracers/root_listeners.py

@@ -12,6 +12,8 @@ Listener = Union[Callable[[Run], None], Callable[[Run, RunnableConfig], None]]
 
 
 class RootListenersTracer(BaseTracer):
+    """A tracer that calls listeners on run start, end, and error."""
+
     def __init__(
         self,
         *,