langchain_core.callbacks.manager.CallbackManager¶

class langchain_core.callbacks.manager.CallbackManager(handlers: List[BaseCallbackHandler], inheritable_handlers: Optional[List[BaseCallbackHandler]] = None, parent_run_id: Optional[UUID] = None, *, tags: Optional[List[str]] = None, inheritable_tags: Optional[List[str]] = None, metadata: Optional[Dict[str, Any]] = None, inheritable_metadata: Optional[Dict[str, Any]] = None)[source]¶

Callback manager that handles callbacks from LangChain.

Initialize callback manager.

Attributes

is_async

Whether the callback manager is async.

Methods

__init__(handlers[, inheritable_handlers, ...])

Initialize callback manager.

add_handler(handler[, inherit])

Add a handler to the callback manager.

add_metadata(metadata[, inherit])

add_tags(tags[, inherit])

configure([inheritable_callbacks, ...])

Configure the callback manager.

copy()

Copy the callback manager.

on_chain_start(serialized, inputs[, run_id])

Run when chain starts running.

on_chat_model_start(serialized, messages, ...)

Run when LLM starts running.

on_llm_start(serialized, prompts, **kwargs)

Run when LLM starts running.

on_retriever_start(serialized, query[, ...])

Run when retriever starts running.

on_tool_start(serialized, input_str[, ...])

Run when tool starts running.

remove_handler(handler)

Remove a handler from the callback manager.

remove_metadata(keys)

remove_tags(tags)

set_handler(handler[, inherit])

Set handler as the only handler on the callback manager.

set_handlers(handlers[, inherit])

Set handlers as the only handlers on the callback manager.
__init__(handlers: List[BaseCallbackHandler], inheritable_handlers: Optional[List[BaseCallbackHandler]] = None, parent_run_id: Optional[UUID] = None, *, tags: Optional[List[str]] = None, inheritable_tags: Optional[List[str]] = None, metadata: Optional[Dict[str, Any]] = None, inheritable_metadata: Optional[Dict[str, Any]] = None) → None¶

Initialize callback manager.

add_handler(handler: BaseCallbackHandler, inherit: bool = True) → None¶

Add a handler to the callback manager.

add_metadata(metadata: Dict[str, Any], inherit: bool = True) → None¶
add_tags(tags: List[str], inherit: bool = True) → None¶
classmethod configure(inheritable_callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None, local_callbacks: Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]] = None, verbose: bool = False, inheritable_tags: Optional[List[str]] = None, local_tags: Optional[List[str]] = None, inheritable_metadata: Optional[Dict[str, Any]] = None, local_metadata: Optional[Dict[str, Any]] = None) → CallbackManager[source]¶

Configure the callback manager.

Parameters

  • inheritable_callbacks (Optional[Callbacks], optional) – The inheritable callbacks. Defaults to None.

  • local_callbacks (Optional[Callbacks], optional) – The local callbacks. Defaults to None.

  • verbose (bool, optional) – Whether to enable verbose mode. Defaults to False.

  • inheritable_tags (Optional[List[str]], optional) – The inheritable tags. Defaults to None.

  • local_tags (Optional[List[str]], optional) – The local tags. Defaults to None.

  • inheritable_metadata (Optional[Dict[str, Any]], optional) – The inheritable metadata. Defaults to None.

  • local_metadata (Optional[Dict[str, Any]], optional) – The local metadata. Defaults to None.

Returns

The configured callback manager.

Return type

CallbackManager

copy() → T¶

Copy the callback manager.

on_chain_start(serialized: Dict[str, Any], inputs: Union[Dict[str, Any], Any], run_id: Optional[UUID] = None, **kwargs: Any) → CallbackManagerForChainRun[source]¶

Run when chain starts running.

Parameters

  • serialized (Dict[str, Any]) – The serialized chain.

  • inputs (Union[Dict[str, Any], Any]) – The inputs to the chain.

  • run_id (UUID, optional) – The ID of the run. Defaults to None.

Returns

The callback manager for the chain run.

Return type

CallbackManagerForChainRun

on_chat_model_start(serialized: Dict[str, Any], messages: List[List[BaseMessage]], **kwargs: Any) → List[CallbackManagerForLLMRun][source]¶

Run when LLM starts running.

Parameters

  • serialized (Dict[str, Any]) – The serialized LLM.

  • messages (List[List[BaseMessage]]) – The list of messages.

  • run_id (UUID, optional) – The ID of the run. Defaults to None.

Returns

A callback manager for each

list of messages as an LLM run.

Return type

List[CallbackManagerForLLMRun]

on_llm_start(serialized: Dict[str, Any], prompts: List[str], **kwargs: Any) → List[CallbackManagerForLLMRun][source]¶

Run when LLM starts running.

Parameters

  • serialized (Dict[str, Any]) – The serialized LLM.

  • prompts (List[str]) – The list of prompts.

  • run_id (UUID, optional) – The ID of the run. Defaults to None.

Returns

A callback manager for each

prompt as an LLM run.

Return type

List[CallbackManagerForLLMRun]

on_retriever_start(serialized: Dict[str, Any], query: str, run_id: Optional[UUID] = None, parent_run_id: Optional[UUID] = None, **kwargs: Any) → CallbackManagerForRetrieverRun[source]¶

Run when retriever starts running.

on_tool_start(serialized: Dict[str, Any], input_str: str, run_id: Optional[UUID] = None, parent_run_id: Optional[UUID] = None, inputs: Optional[Dict[str, Any]] = None, **kwargs: Any) → CallbackManagerForToolRun[source]¶

Run when tool starts running.

Parameters

  • serialized – Serialized representation of the tool.

  • input_str – The input to the tool as a string. Non-string inputs are cast to strings.

  • run_id – ID for the run. Defaults to None.

  • parent_run_id – The ID of the parent run. Defaults to None.

  • inputs – The original input to the tool if provided. Recommended for usage instead of input_str when the original input is needed. If provided, the inputs are expected to be formatted as a dict. The keys will correspond to the named-arguments in the tool.

Returns

The callback manager for the tool run.

Return type

CallbackManagerForToolRun

remove_handler(handler: BaseCallbackHandler) → None¶

Remove a handler from the callback manager.

remove_metadata(keys: List[str]) → None¶
remove_tags(tags: List[str]) → None¶
set_handler(handler: BaseCallbackHandler, inherit: bool = True) → None¶

Set handler as the only handler on the callback manager.

set_handlers(handlers: List[BaseCallbackHandler], inherit: bool = True) → None¶

Set handlers as the only handlers on the callback manager.

Examples using CallbackManager¶