This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::BedrockAgentCore::Harness HarnessGeminiModelConfig
<a name="aws-properties-bedrockagentcore-harness-harnessgeminimodelconfig"></a>

Configuration for a Google Gemini model provider. Requires an API key stored in AgentCore Identity.

## Syntax
<a name="aws-properties-bedrockagentcore-harness-harnessgeminimodelconfig-syntax"></a>

To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-bedrockagentcore-harness-harnessgeminimodelconfig-syntax.json"></a>

```
{
  "[ApiKeyArn](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-apikeyarn)" : {{String}},
  "[MaxTokens](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-maxtokens)" : {{Integer}},
  "[ModelId](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-modelid)" : {{String}},
  "[Temperature](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-temperature)" : {{Number}},
  "[TopK](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-topk)" : {{Integer}},
  "[TopP](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-topp)" : {{Number}}
}
```

### YAML
<a name="aws-properties-bedrockagentcore-harness-harnessgeminimodelconfig-syntax.yaml"></a>

```
  [ApiKeyArn](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-apikeyarn): {{String}}
  [MaxTokens](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-maxtokens): {{Integer}}
  [ModelId](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-modelid): {{String}}
  [Temperature](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-temperature): {{Number}}
  [TopK](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-topk): {{Integer}}
  [TopP](#cfn-bedrockagentcore-harness-harnessgeminimodelconfig-topp): {{Number}}
```

## Properties
<a name="aws-properties-bedrockagentcore-harness-harnessgeminimodelconfig-properties"></a>

`ApiKeyArn`  <a name="cfn-bedrockagentcore-harness-harnessgeminimodelconfig-apikeyarn"></a>
The ARN of your Gemini API key on AgentCore Identity.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^arn:aws:bedrock-agentcore:[a-z0-9-]+:[0-9]{12}:token-vault/[a-zA-Z0-9-.]+/apikeycredentialprovider/[a-zA-Z0-9-.]+$`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`MaxTokens`  <a name="cfn-bedrockagentcore-harness-harnessgeminimodelconfig-maxtokens"></a>
The maximum number of tokens to allow in the generated response per model call.  
*Required*: No  
*Type*: Integer  
*Minimum*: `1`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`ModelId`  <a name="cfn-bedrockagentcore-harness-harnessgeminimodelconfig-modelid"></a>
The Gemini model ID.  
*Required*: Yes  
*Type*: String  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Temperature`  <a name="cfn-bedrockagentcore-harness-harnessgeminimodelconfig-temperature"></a>
The temperature to set when calling the model.  
*Required*: No  
*Type*: Number  
*Minimum*: `0`  
*Maximum*: `2`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`TopK`  <a name="cfn-bedrockagentcore-harness-harnessgeminimodelconfig-topk"></a>
The topK set when calling the model.  
*Required*: No  
*Type*: Integer  
*Minimum*: `0`  
*Maximum*: `500`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`TopP`  <a name="cfn-bedrockagentcore-harness-harnessgeminimodelconfig-topp"></a>
The topP set when calling the model.  
*Required*: No  
*Type*: Number  
*Minimum*: `0`  
*Maximum*: `1`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)