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

# Tool Structure & Parameters

> Define parameter schemas, validation, and return types.

## Parameters

<ParamField body="param" type="string" required>Describe expected parameter</ParamField>

## Validation

* Required fields enforced
* Types checked at runtime
* Descriptive error messages

## Returns

* Structured objects for capture variables
* Consistent error shape for failures