# FunctionDescription

> **Class** in `langchain_core`

📖 [View in docs](https://reference.langchain.com/python/langchain-core/utils/function_calling/FunctionDescription)

Representation of a callable function to send to an LLM.

## Signature

```python
FunctionDescription()
```

## Extends

- `TypedDict`

## Constructors

```python
__init__(
    name: str,
    description: str,
    parameters: dict,
)
```

| Name | Type |
|------|------|
| `name` | `str` |
| `description` | `str` |
| `parameters` | `dict` |


## Properties

- `name`
- `description`
- `parameters`

---

[View source on GitHub](https://github.com/langchain-ai/langchain/blob/6fb37dba71da807af60aa7b909f71f0625a666bf/libs/core/langchain_core/utils/function_calling.py#L66)