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

# Creating Tools

> Build custom tools for your agents

# Creating Tools

Learn how to create custom tools that extend your agent's capabilities.

## Tool Creation Overview

<Info>
  Tools are modular components that add specific functionalities to your agents. They can range from simple utility functions to complex integrations with external services.
</Info>

## Tool Components

<CardGroup cols={2}>
  <Card title="Interface" icon="code">
    * Input/Output definitions
    * Parameter types
    * Return values
  </Card>

  <Card title="Logic" icon="gears">
    * Core functionality
    * Business rules
    * Processing steps
  </Card>

  <Card title="Configuration" icon="sliders">
    * Settings
    * Options
    * Defaults
  </Card>

  <Card title="Documentation" icon="book">
    * Usage guide
    * Examples
    * API reference
  </Card>
</CardGroup>

## Creating a Tool

<Steps>
  <Step title="Define Interface">
    Specify tool interface

    * Define inputs
    * Specify outputs
    * Set parameters
  </Step>

  <Step title="Implement Logic">
    Build core functionality

    * Write business logic
    * Handle errors
    * Add validation
  </Step>

  <Step title="Configure Settings">
    Set up tool configuration

    * Default values
    * Options
    * Limits
  </Step>

  <Step title="Add Documentation">
    Document the tool

    * Usage guide
    * Examples
    * API docs
  </Step>
</Steps>

## Tool Structure

<AccordionGroup>
  <Accordion title="Tool Definition">
    ```typescript theme={null}
    interface Tool {
      name: string;
      description: string;
      version: string;
      parameters: Parameter[];
      returns: ReturnType;
    }

    interface Parameter {
      name: string;
      type: string;
      required: boolean;
      default?: any;
    }
    ```
  </Accordion>

  <Accordion title="Implementation">
    ```typescript theme={null}
    class CustomTool implements Tool {
      async execute(params: any): Promise<Result> {
        // Validate inputs
        this.validateParams(params);
        
        // Process
        const result = await this.process(params);
        
        // Return results
        return this.formatResponse(result);
      }
    }
    ```
  </Accordion>

  <Accordion title="Configuration">
    ```json theme={null}
    {
      "tool": {
        "name": "data_processor",
        "version": "1.0.0",
        "settings": {
          "timeout": 5000,
          "retry_count": 3,
          "cache_enabled": true
        }
      }
    }
    ```
  </Accordion>
</AccordionGroup>

## Tool Examples

<CodeGroup>
  ```typescript Data Processor theme={null}
  export class DataProcessor implements Tool {
    name = 'data_processor';
    description = 'Process and transform data';
    
    async execute(data: any): Promise<Result> {
      // Implementation
      return processedData;
    }
  }
  ```

  ```typescript API Client theme={null}
  export class APIClient implements Tool {
    name = 'api_client';
    description = 'Make API calls';
    
    async execute(request: Request): Promise<Response> {
      // Implementation
      return response;
    }
  }
  ```

  ```typescript File Handler theme={null}
  export class FileHandler implements Tool {
    name = 'file_handler';
    description = 'Handle file operations';
    
    async execute(file: File): Promise<Result> {
      // Implementation
      return result;
    }
  }
  ```
</CodeGroup>

## Best Practices

<CardGroup cols={2}>
  <Card title="Modularity" icon="cubes">
    Keep tools focused and modular
  </Card>

  <Card title="Error Handling" icon="triangle-exclamation">
    Implement robust error handling
  </Card>

  <Card title="Documentation" icon="book">
    Provide clear documentation
  </Card>

  <Card title="Testing" icon="vial">
    Thoroughly test functionality
  </Card>
</CardGroup>

## Testing Tools

<Steps>
  <Step title="Unit Testing">
    Test individual components
  </Step>

  <Step title="Integration Testing">
    Test with other tools
  </Step>

  <Step title="Performance Testing">
    Check resource usage
  </Step>

  <Step title="User Testing">
    Validate usability
  </Step>
</Steps>

## Next Steps

* [Managing Tools](managing-tools)
* [Tool Best Practices](tool-best-practices)
* [Advanced Tool Development](advanced-tools)