# Think Tool


_Step-by-step reasoning scratchpad for planning and decision-making._

## Overview

The think tool is a reasoning scratchpad that lets agents think step-by-step before acting. The agent can write its thoughts without producing visible output to the user — ideal for planning complex tasks, breaking down problems, and reasoning through multi-step solutions.

This is a lightweight tool with no side effects. It is most useful for models that lack built-in reasoning or thinking capabilities (e.g., smaller or older models). For models that already support native thinking — such as Claude with extended thinking, OpenAI o-series, or Gemini with a thinking budget — this tool is unnecessary since the model can reason internally.

## Configuration

```yaml
toolsets:
  - type: think
```

No configuration options.

> [!TIP]
> **When to use**
>
> Use the think tool with models that don't have native reasoning capabilities. If your model already supports a [thinking budget](/ai/configuration/models/#thinking-budget), you likely don't need this tool.