langchain_core.messages.system.SystemMessage

class langchain_core.messages.system.SystemMessage[source]

Bases: BaseMessage

Message for priming AI behavior.

The system message is usually passed in as the first of a sequence of input messages.

Example

from langchain_core.messages import HumanMessage, SystemMessage

messages = [
    SystemMessage(
        content="You are a helpful assistant! Your name is Bob."
    ),
    HumanMessage(
        content="What is your name?"
    )
]

# Define a chat model and invoke it with the messages
print(model.invoke(messages))

Pass in content as positional arg.

Parameters

  • content – The string contents of the message.

  • kwargs – Additional fields to pass to the message.

param additional_kwargs: dict [Optional]

Reserved for additional payload data associated with the message.

For example, for a message from an AI, this could include tool calls as encoded by the model provider.

param content: Union[str, List[Union[str, Dict]]] [Required]

The string contents of the message.

param id: Optional[str] = None

An optional unique identifier for the message. This should ideally be provided by the provider/model which created the message.

param name: Optional[str] = None

An optional name for the message.

This can be used to provide a human-readable name for the message.

Usage of this field is optional, and whether it’s used or not is up to the model implementation.

param response_metadata: dict [Optional]

Response metadata. For example: response headers, logprobs, token counts.

param type: Literal['system'] = 'system'

The type of the message (used for serialization). Defaults to “system”.

pretty_print() → None
Return type

None

pretty_repr(html: bool = False) → str

Get a pretty representation of the message.

Parameters

html (bool) – Whether to format the message as HTML. If True, the message will be formatted with HTML tags. Default is False.

Returns

A pretty representation of the message.

Return type

str

Examples using SystemMessage