tool_message

langroid/agent/tool_message.py

Structured messages to an agent, typically from an LLM, to be handled by an agent. The messages could represent, for example: - information or data given to the agent - request for information or data from the agent - request to run a method of the agent

ToolMessage

Bases: ABC, BaseModel

Abstract Class for a class that defines the structure of a "Tool" message from an LLM. Depending on context, "tools" are also referred to as "plugins", or "function calls" (in the context of OpenAI LLMs). Essentially, they are a way for the LLM to express its intent to run a special function or method. Currently these "tools" are handled by methods of the agent.

Attributes:

Name	Type	Description
request	str	name of agent method to map to.
purpose	str	purpose of agent method, expressed in general terms. (This is used when auto-generating the tool instruction to the LLM)

examples() classmethod

Examples to use in few-shot demos with formatting instructions. Each example can be either: - just a ToolMessage instance, e.g. MyTool(param1=1, param2="hello"), or - a tuple (description, ToolMessage instance), where the description is a natural language "thought" that leads to the tool usage, e.g. ("I want to find the square of 5", SquareTool(num=5)) In some scenarios, including such a description can significantly enhance reliability of tool use. Returns:

Source code in langroid/agent/tool_message.py

@classmethod
def examples(cls) -> List["ToolMessage" | Tuple[str, "ToolMessage"]]:
    """
    Examples to use in few-shot demos with formatting instructions.
    Each example can be either:
    - just a ToolMessage instance, e.g. MyTool(param1=1, param2="hello"), or
    - a tuple (description, ToolMessage instance), where the description is
        a natural language "thought" that leads to the tool usage,
        e.g. ("I want to find the square of 5",  SquareTool(num=5))
        In some scenarios, including such a description can significantly
        enhance reliability of tool use.
    Returns:
    """
    return []

usage_examples(random=False) classmethod

Instruction to the LLM showing examples of how to use the tool-message.

Parameters:

Name	Type	Description	Default
random	bool	whether to pick a random example from the list of examples. Set to true when using this to illustrate a dialog between LLM and user. (if false, use ALL examples)	False

Returns: str: examples of how to use the tool/function-call

Source code in langroid/agent/tool_message.py

@classmethod
def usage_examples(cls, random: bool = False) -> str:
    """
    Instruction to the LLM showing examples of how to use the tool-message.

    Args:
        random (bool): whether to pick a random example from the list of examples.
            Set to `true` when using this to illustrate a dialog between LLM and
            user.
            (if false, use ALL examples)
    Returns:
        str: examples of how to use the tool/function-call
    """
    # pick a random example of the fields
    if len(cls.examples()) == 0:
        return ""
    if random:
        examples = [choice(cls.examples())]
    else:
        examples = cls.examples()
    formatted_examples = [
        (
            f"EXAMPLE {i}: (THOUGHT: {ex[0]}) => \n{ex[1].format_example()}"
            if isinstance(ex, tuple)
            else f"EXAMPLE {i}:\n {ex.format_example()}"
        )
        for i, ex in enumerate(examples, 1)
    ]
    return "\n\n".join(formatted_examples)

get_value_of_type(target_type)

Try to find a value of a desired type in the fields of the ToolMessage.

Source code in langroid/agent/tool_message.py

def get_value_of_type(self, target_type: Type[Any]) -> Any:
    """Try to find a value of a desired type in the fields of the ToolMessage."""
    ignore_fields = self.Config.schema_extra["exclude"].union(["request"])
    for field_name in set(self.dict().keys()) - ignore_fields:
        value = getattr(self, field_name)
        if is_instance_of(value, target_type):
            return value
    return None

default_value(f) classmethod

Returns the default value of the given field, for the message-class Args: f (str): field name

Returns:

Name	Type	Description
Any	Any	default value of the field, or None if not set or if the field does not exist.

Source code in langroid/agent/tool_message.py

@classmethod
def default_value(cls, f: str) -> Any:
    """
    Returns the default value of the given field, for the message-class
    Args:
        f (str): field name

    Returns:
        Any: default value of the field, or None if not set or if the
            field does not exist.
    """
    schema = cls.schema()
    properties = schema["properties"]
    return properties.get(f, {}).get("default", None)

format_instructions(tool=False) classmethod

Default Instructions to the LLM showing how to use the tool/function-call. Works for GPT4 but override this for weaker LLMs if needed.

Parameters:

Name	Type	Description	Default
tool	bool	instructions for Langroid-native tool use? (e.g. for non-OpenAI LLM) (or else it would be for OpenAI Function calls)	False

Returns: str: instructions on how to use the message

Source code in langroid/agent/tool_message.py

@classmethod
def format_instructions(cls, tool: bool = False) -> str:
    """
    Default Instructions to the LLM showing how to use the tool/function-call.
    Works for GPT4 but override this for weaker LLMs if needed.

    Args:
        tool: instructions for Langroid-native tool use? (e.g. for non-OpenAI LLM)
            (or else it would be for OpenAI Function calls)
    Returns:
        str: instructions on how to use the message
    """
    # TODO: when we attempt to use a "simpler schema"
    # (i.e. all nested fields explicit without definitions),
    # we seem to get worse results, so we turn it off for now
    param_dict = (
        # cls.simple_schema() if tool else
        cls.llm_function_schema(request=True).parameters
    )
    examples_str = ""
    if cls.examples():
        examples_str = "EXAMPLES:\n" + cls.usage_examples()
    return textwrap.dedent(
        f"""
        TOOL: {cls.default_value("request")}
        PURPOSE: {cls.default_value("purpose")} 
        JSON FORMAT: {
            json.dumps(param_dict, indent=4)
        }
        {examples_str}
        """.lstrip()
    )

group_format_instructions() staticmethod

Template for instructions for a group of tools. Works with GPT4 but override this for weaker LLMs if needed.

Source code in langroid/agent/tool_message.py

@staticmethod
def group_format_instructions() -> str:
    """Template for instructions for a group of tools.
    Works with GPT4 but override this for weaker LLMs if needed.
    """
    return textwrap.dedent(
        """
        === ALL AVAILABLE TOOLS and THEIR FORMAT INSTRUCTIONS ===
        You have access to the following TOOLS to accomplish your task:

        {format_instructions}

        When one of the above TOOLs is applicable, you must express your 
        request as "TOOL:" followed by the request in the above format.
        """
    )

llm_function_schema(request=False, defaults=True) classmethod

Clean up the schema of the Pydantic class (which can recursively contain other Pydantic classes), to create a version compatible with OpenAI Function-call API.

Adapted from this excellent library: https://github.com/jxnl/instructor/blob/main/instructor/function_calls.py

Parameters:

Name	Type	Description	Default
request	bool	whether to include the "request" field in the schema. (we set this to True when using Langroid-native TOOLs as opposed to OpenAI Function calls)	False
defaults	bool	whether to include fields with default values in the schema, in the "properties" section.	True

Returns:

Name	Type	Description
LLMFunctionSpec	LLMFunctionSpec	the schema as an LLMFunctionSpec

Source code in langroid/agent/tool_message.py

@classmethod
def llm_function_schema(
    cls,
    request: bool = False,
    defaults: bool = True,
) -> LLMFunctionSpec:
    """
    Clean up the schema of the Pydantic class (which can recursively contain
    other Pydantic classes), to create a version compatible with OpenAI
    Function-call API.

    Adapted from this excellent library:
    https://github.com/jxnl/instructor/blob/main/instructor/function_calls.py

    Args:
        request: whether to include the "request" field in the schema.
            (we set this to True when using Langroid-native TOOLs as opposed to
            OpenAI Function calls)
        defaults: whether to include fields with default values in the schema,
                in the "properties" section.

    Returns:
        LLMFunctionSpec: the schema as an LLMFunctionSpec

    """
    schema = cls.schema()
    docstring = parse(cls.__doc__ or "")
    parameters = {
        k: v for k, v in schema.items() if k not in ("title", "description")
    }
    for param in docstring.params:
        if (name := param.arg_name) in parameters["properties"] and (
            description := param.description
        ):
            if "description" not in parameters["properties"][name]:
                parameters["properties"][name]["description"] = description

    excludes = cls.Config.schema_extra["exclude"]
    if not request:
        excludes = excludes.union({"request"})
    # exclude 'excludes' from parameters["properties"]:
    parameters["properties"] = {
        field: details
        for field, details in parameters["properties"].items()
        if field not in excludes and (defaults or details.get("default") is None)
    }
    parameters["required"] = sorted(
        k
        for k, v in parameters["properties"].items()
        if ("default" not in v and k not in excludes)
    )
    if request:
        parameters["required"].append("request")

    if "description" not in schema:
        if docstring.short_description:
            schema["description"] = docstring.short_description
        else:
            schema["description"] = (
                f"Correctly extracted `{cls.__name__}` with all "
                f"the required parameters with correct types"
            )

    parameters.pop("exclude")
    _recursive_purge_dict_key(parameters, "title")
    _recursive_purge_dict_key(parameters, "additionalProperties")
    return LLMFunctionSpec(
        name=cls.default_value("request"),
        description=cls.default_value("purpose"),
        parameters=parameters,
    )

simple_schema() classmethod

Return a simplified schema for the message, with only the request and required fields. Returns: Dict[str, Any]: simplified schema

Source code in langroid/agent/tool_message.py

@classmethod
def simple_schema(cls) -> Dict[str, Any]:
    """
    Return a simplified schema for the message, with only the request and
    required fields.
    Returns:
        Dict[str, Any]: simplified schema
    """
    schema = generate_simple_schema(
        cls,
        exclude=list(cls.Config.schema_extra["exclude"]),
    )
    return schema