> ## 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.

# Tool Validation Error • AI Agent SDK

> ToolValidationError: Raised when a tool fails validation.

# ToolValidationError

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

AI Agent

Raised when a tool fails validation.

```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: ToolValidationError"]
    tool -- "returns" --> result["Result"]
    style tool fill:#189AB4,color:#fff
    style agent fill:#8B0000,color:#fff
    style result fill:#8B0000,color:#fff
```

## Source

> [card] [View on GitHub](https://github.com/MervinPraison/PraisonAI/blob/main/src/praisonai-agents/praisonaiagents/tools/base.py#L27)
>
> `praisonaiagents/tools/base.py` at line 27

***

## 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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