# ToolInputSchema
<a name="API_ToolInputSchema"></a>

The schema definition for tool input parameters.

## Contents
<a name="API_ToolInputSchema_Contents"></a>

**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** json **   <a name="novaact-Type-ToolInputSchema-json"></a>
The JSON schema that defines the expected input format for the tool.  
Type: JSON value  
Required: No

## See Also
<a name="API_ToolInputSchema_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/nova-act-2025-08-22/ToolInputSchema) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/nova-act-2025-08-22/ToolInputSchema) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/nova-act-2025-08-22/ToolInputSchema)