> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Function Tool • AI Agent SDK

> FunctionTool: A BaseTool wrapper for plain functions.

# FunctionTool

> Defined in the [**decorator**](https://praison.ai/docs/sdk/reference/praisonaiagents/modules/decorator.md) module.

AI Agent

A BaseTool wrapper for plain functions.

Created automatically by the @tool decorator.
Supports Injected\[T] parameters for state injection.

```mermaid theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
%%{init: {'theme': 'base', 'themeVariables': { 'primaryColor': '#8B0000', 'primaryTextColor': '#fff', 'primaryBorderColor': '#710101', 'lineColor': '#189AB4', 'secondaryColor': '#189AB4', 'tertiaryColor': '#fff' }}}%%

graph LR
    agent["Agent"] -- "uses" --> tool["Tool: FunctionTool"]
    tool -- "returns" --> result["Result"]
    style tool fill:#189AB4,color:#fff
    style agent fill:#8B0000,color:#fff
    style result fill:#8B0000,color:#fff
```

## Constructor

**func** `Callable` *required*

No description available.

**name** `Optional[str]`

No description available.

**description** `Optional[str]`

No description available.

**version** `str` (default: '1.0.0')

No description available.

**availability** `Optional`

No description available.

**dynamic\_schema\_overrides** `Optional`

No description available.

**retry\_policy** `Optional`

No description available.

**approval** `Optional`

No description available.

**requires\_approval** `Union[bool, str]` (default: \_UNSET)

No description available.

**to\_model\_output** `Optional`

No description available.

**restart\_safe** `Optional[bool]`

No description available.

**input\_guardrails** `Optional`

No description available.

**output\_guardrails** `Optional`

No description available.

## Methods

> [card] [injected\_params()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/FunctionTool-injected_params.md)
>
> Get the injected parameters for this tool.

> [card] [run()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/FunctionTool-run.md)
>
> Execute the wrapped function with injected state.

> [card] [to\_model\_output()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/FunctionTool-to_model_output.md)
>
> Build the compact model-facing view via the `to_model_output` fn.

> [card] [check\_availability()](https://praison.ai/docs/sdk/reference/praisonaiagents/functions/FunctionTool-check_availability.md)
>
> Check if this tool is currently available to run.

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/tools/decorator.py#L108)
>
> `praisonaiagents/tools/decorator.py` at line 108

***

## Related Documentation

> [card] [Tools Concept](https://praison.ai/docs/docs/concepts/tools)

> [card] [Create Custom Tools](https://praison.ai/docs/docs/guides/tools/create-custom-tools)

> [card] [Tool Development](https://praison.ai/docs/docs/tutorials/advanced-tool-development)


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