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

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

<a name="aws-resource-bedrockagentcore-harness-description"></a>The `AWS::BedrockAgentCore::Harness` resource Property description not available. for BedrockAgentCore.

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

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

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

```
{
  "Type" : "AWS::BedrockAgentCore::Harness",
  "Properties" : {
      "[AllowedTools](#cfn-bedrockagentcore-harness-allowedtools)" : {{[ String, ... ]}},
      "[AuthorizerConfiguration](#cfn-bedrockagentcore-harness-authorizerconfiguration)" : {{AuthorizerConfiguration}},
      "[Environment](#cfn-bedrockagentcore-harness-environment)" : {{HarnessEnvironmentProvider}},
      "[EnvironmentArtifact](#cfn-bedrockagentcore-harness-environmentartifact)" : {{HarnessEnvironmentArtifact}},
      "[EnvironmentVariables](#cfn-bedrockagentcore-harness-environmentvariables)" : {{{{{Key}}: {{Value}}, ...}}},
      "[ExecutionRoleArn](#cfn-bedrockagentcore-harness-executionrolearn)" : {{String}},
      "[HarnessName](#cfn-bedrockagentcore-harness-harnessname)" : {{String}},
      "[MaxIterations](#cfn-bedrockagentcore-harness-maxiterations)" : {{Integer}},
      "[MaxTokens](#cfn-bedrockagentcore-harness-maxtokens)" : {{Integer}},
      "[Memory](#cfn-bedrockagentcore-harness-memory)" : {{HarnessMemoryConfiguration}},
      "[Model](#cfn-bedrockagentcore-harness-model)" : {{HarnessModelConfiguration}},
      "[Skills](#cfn-bedrockagentcore-harness-skills)" : {{[ HarnessSkill, ... ]}},
      "[SystemPrompt](#cfn-bedrockagentcore-harness-systemprompt)" : {{[ HarnessSystemContentBlock, ... ]}},
      "[Tags](#cfn-bedrockagentcore-harness-tags)" : {{[ Tag, ... ]}},
      "[TimeoutSeconds](#cfn-bedrockagentcore-harness-timeoutseconds)" : {{Integer}},
      "[Tools](#cfn-bedrockagentcore-harness-tools)" : {{[ HarnessTool, ... ]}},
      "[Truncation](#cfn-bedrockagentcore-harness-truncation)" : {{HarnessTruncationConfiguration}}
    }
}
```

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

```
Type: AWS::BedrockAgentCore::Harness
Properties:
  [AllowedTools](#cfn-bedrockagentcore-harness-allowedtools): {{
    - String}}
  [AuthorizerConfiguration](#cfn-bedrockagentcore-harness-authorizerconfiguration): {{
    AuthorizerConfiguration}}
  [Environment](#cfn-bedrockagentcore-harness-environment): {{
    HarnessEnvironmentProvider}}
  [EnvironmentArtifact](#cfn-bedrockagentcore-harness-environmentartifact): {{
    HarnessEnvironmentArtifact}}
  [EnvironmentVariables](#cfn-bedrockagentcore-harness-environmentvariables): {{
    {{Key}}: {{Value}}}}
  [ExecutionRoleArn](#cfn-bedrockagentcore-harness-executionrolearn): {{String}}
  [HarnessName](#cfn-bedrockagentcore-harness-harnessname): {{String}}
  [MaxIterations](#cfn-bedrockagentcore-harness-maxiterations): {{Integer}}
  [MaxTokens](#cfn-bedrockagentcore-harness-maxtokens): {{Integer}}
  [Memory](#cfn-bedrockagentcore-harness-memory): {{
    HarnessMemoryConfiguration}}
  [Model](#cfn-bedrockagentcore-harness-model): {{
    HarnessModelConfiguration}}
  [Skills](#cfn-bedrockagentcore-harness-skills): {{
    - HarnessSkill}}
  [SystemPrompt](#cfn-bedrockagentcore-harness-systemprompt): {{
    - HarnessSystemContentBlock}}
  [Tags](#cfn-bedrockagentcore-harness-tags): {{
    - Tag}}
  [TimeoutSeconds](#cfn-bedrockagentcore-harness-timeoutseconds): {{Integer}}
  [Tools](#cfn-bedrockagentcore-harness-tools): {{
    - HarnessTool}}
  [Truncation](#cfn-bedrockagentcore-harness-truncation): {{
    HarnessTruncationConfiguration}}
```

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

`AllowedTools`  <a name="cfn-bedrockagentcore-harness-allowedtools"></a>
The allowed tools of the Harness. All tools are allowed by default.  
*Required*: No  
*Type*: Array of String  
*Minimum*: `1`  
*Maximum*: `64`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`AuthorizerConfiguration`  <a name="cfn-bedrockagentcore-harness-authorizerconfiguration"></a>
Represents inbound authorization configuration options used to authenticate incoming requests.   
*Required*: No  
*Type*: [AuthorizerConfiguration](aws-properties-bedrockagentcore-harness-authorizerconfiguration.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Environment`  <a name="cfn-bedrockagentcore-harness-environment"></a>
The compute environment on which the Harness runs.  
*Required*: No  
*Type*: [HarnessEnvironmentProvider](aws-properties-bedrockagentcore-harness-harnessenvironmentprovider.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`EnvironmentArtifact`  <a name="cfn-bedrockagentcore-harness-environmentartifact"></a>
The environment artifact (e.g., container) in which the Harness operates.  
*Required*: No  
*Type*: [HarnessEnvironmentArtifact](aws-properties-bedrockagentcore-harness-harnessenvironmentartifact.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`EnvironmentVariables`  <a name="cfn-bedrockagentcore-harness-environmentvariables"></a>
Environment variables exposed in the environment in which the Harness operates.  
*Required*: No  
*Type*: Object of String  
*Pattern*: `^[\s\S]*$`  
*Minimum*: `0`  
*Maximum*: `5000`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`ExecutionRoleArn`  <a name="cfn-bedrockagentcore-harness-executionrolearn"></a>
IAM role the Harness assumes when running.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^arn:aws(-[^:]+)?:iam::[0-9]{12}:role/.+$`  
*Minimum*: `1`  
*Maximum*: `2048`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`HarnessName`  <a name="cfn-bedrockagentcore-harness-harnessname"></a>
The name of the Harness.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^[a-zA-Z][a-zA-Z0-9_]{0,39}$`  
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`MaxIterations`  <a name="cfn-bedrockagentcore-harness-maxiterations"></a>
The maximum number of iterations in the agent loop allowed before exiting per invocation.  
*Required*: No  
*Type*: Integer  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`MaxTokens`  <a name="cfn-bedrockagentcore-harness-maxtokens"></a>
The maximum total number of output tokens the agent can generate across all model calls within a single invocation.  
*Required*: No  
*Type*: Integer  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Memory`  <a name="cfn-bedrockagentcore-harness-memory"></a>
AgentCore Memory instance configuration for short and long term memory.  
*Required*: No  
*Type*: [HarnessMemoryConfiguration](aws-properties-bedrockagentcore-harness-harnessmemoryconfiguration.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Model`  <a name="cfn-bedrockagentcore-harness-model"></a>
The configuration of the default model used by the Harness.  
*Required*: Yes  
*Type*: [HarnessModelConfiguration](aws-properties-bedrockagentcore-harness-harnessmodelconfiguration.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Skills`  <a name="cfn-bedrockagentcore-harness-skills"></a>
The skills of the Harness.  
*Required*: No  
*Type*: Array of [HarnessSkill](aws-properties-bedrockagentcore-harness-harnessskill.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`SystemPrompt`  <a name="cfn-bedrockagentcore-harness-systemprompt"></a>
The system prompt of the Harness.  
*Required*: No  
*Type*: Array of [HarnessSystemContentBlock](aws-properties-bedrockagentcore-harness-harnesssystemcontentblock.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Tags`  <a name="cfn-bedrockagentcore-harness-tags"></a>
Property description not available.  
*Required*: No  
*Type*: Array of [Tag](aws-properties-bedrockagentcore-harness-tag.md)  
*Maximum*: `50`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`TimeoutSeconds`  <a name="cfn-bedrockagentcore-harness-timeoutseconds"></a>
The maximum duration per invocation.  
*Required*: No  
*Type*: Integer  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Tools`  <a name="cfn-bedrockagentcore-harness-tools"></a>
The tools of the Harness.  
*Required*: No  
*Type*: Array of [HarnessTool](aws-properties-bedrockagentcore-harness-harnesstool.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Truncation`  <a name="cfn-bedrockagentcore-harness-truncation"></a>
Configuration for truncating model context.  
*Required*: No  
*Type*: [HarnessTruncationConfiguration](aws-properties-bedrockagentcore-harness-harnesstruncationconfiguration.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

## Return values
<a name="aws-resource-bedrockagentcore-harness-return-values"></a>

### Ref
<a name="aws-resource-bedrockagentcore-harness-return-values-ref"></a>

### Fn::GetAtt
<a name="aws-resource-bedrockagentcore-harness-return-values-fn--getatt"></a>

#### 
<a name="aws-resource-bedrockagentcore-harness-return-values-fn--getatt-fn--getatt"></a>

`Arn`  <a name="Arn-fn::getatt"></a>
The ARN of the Harness.

`CreatedAt`  <a name="CreatedAt-fn::getatt"></a>
The createdAt time of the Harness.

`Environment.AgentCoreRuntimeEnvironment.AgentRuntimeArn`  <a name="Environment.AgentCoreRuntimeEnvironment.AgentRuntimeArn-fn::getatt"></a>
The ARN of the underlying AgentCore Runtime.

`Environment.AgentCoreRuntimeEnvironment.AgentRuntimeId`  <a name="Environment.AgentCoreRuntimeEnvironment.AgentRuntimeId-fn::getatt"></a>
The ID of the underlying AgentCore Runtime.

`Environment.AgentCoreRuntimeEnvironment.AgentRuntimeName`  <a name="Environment.AgentCoreRuntimeEnvironment.AgentRuntimeName-fn::getatt"></a>
The name of the underlying AgentCore Runtime.

`HarnessId`  <a name="HarnessId-fn::getatt"></a>
The ID of the Harness.

`Status`  <a name="Status-fn::getatt"></a>
The status of the Harness.

`UpdatedAt`  <a name="UpdatedAt-fn::getatt"></a>
The updatedAt time of the Harness.