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docs(bedrock): add guardrail_last_turn_only docs #340

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docs(bedrock): add guardrail_last_turn_only docs
aianch Nov 21, 2025
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docs(bedrock): include assistant response in guardrail_last_turn_only…
aianch Nov 21, 2025
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5 changes: 4 additions & 1 deletion docs/user-guide/concepts/model-providers/amazon-bedrock.md
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,7 @@ The [`BedrockModel`](../../../api-reference/models.md#strands.models.bedrock) su
| [`guardrail_redact_input_message`](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_GuardrailStreamConfiguration.html) | If a Bedrock guardrail triggers, replace the input with this message | "[User input redacted.]" |
| [`guardrail_redact_output`](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_GuardrailStreamConfiguration.html) | Flag to redact output if guardrail is triggered | False |
| [`guardrail_redact_output_message`](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_GuardrailStreamConfiguration.html) | If a Bedrock guardrail triggers, replace output with this message | "[Assistant output redacted.]" |
| [`guardrail_last_turn_only`](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_GuardrailStreamConfiguration.html) | Flag to send only the last turn to guardrails instead of full conversation | False |
| [`additional_request_fields`](https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters.html) | Additional inference parameters that the model supports | - |
| [`additional_response_field_paths`](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_ConverseStream.html#bedrock-runtime_ConverseStream-request-additionalModelResponseFieldPaths) | Additional model parameters field paths to return in the response | - |
| `additional_args` | Additional arguments to include in the request. This is included for forwards compatibility of new parameters. | - |
Expand Down Expand Up @@ -290,7 +291,8 @@ bedrock_model = BedrockModel(
guardrail_redact_input=True, # Default: True
guardrail_redact_input_message="Blocked Input!", # Default: [User input redacted.]
guardrail_redact_output=False, # Default: False
guardrail_redact_output_message="Blocked Output!" # Default: [Assistant output redacted.]
guardrail_redact_output_message="Blocked Output!", # Default: [Assistant output redacted.]
guardrail_last_turn_only=False # Default: False - Set to True to evaluate only the last turn
)

guardrail_agent = Agent(model=bedrock_model)
Expand All @@ -303,6 +305,7 @@ When a guardrail is triggered:
- Input redaction (enabled by default): If a guardrail policy is triggered, the input is redacted
- Output redaction (disabled by default): If a guardrail policy is triggered, the output is redacted
- Custom redaction messages can be specified for both input and output redactions
- Last turn only (disabled by default): When enabled, only the last conversation turn (most recent user message and the assistant's response to it, if present) is sent to guardrails instead of the full conversation history. This allows conversations to recover after guardrail interventions.

### Caching

Expand Down
5 changes: 4 additions & 1 deletion docs/user-guide/safety-security/guardrails.md
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Expand Up @@ -33,6 +33,7 @@ bedrock_model = BedrockModel(
guardrail_id="your-guardrail-id", # Your Bedrock guardrail ID
guardrail_version="1", # Guardrail version
guardrail_trace="enabled", # Enable trace info for debugging
guardrail_last_turn_only=False, # Set to True to evaluate only the last turn
)

# Create agent with the guardrail-protected model
Expand All @@ -51,6 +52,8 @@ if response.stop_reason == "guardrail_intervened":
print(f"Conversation: {json.dumps(agent.messages, indent=4)}")
```

**Performance Optimization**: Set `guardrail_last_turn_only=True` to evaluate only the most recent conversation turn (user message and assistant's response to it, if present) instead of the full history. This allows conversations to recover after guardrail interventions. See the [Amazon Bedrock documentation](../concepts/model-providers/amazon-bedrock.md#guardrails) for more details.

Alternatively, if you want to implement your own soft-launching guardrails, you can utilize Hooks along with Bedrock's ApplyGuardrail API in shadow mode. This approach allows you to track when guardrails would be triggered without actually blocking content, enabling you to monitor and tune your guardrails before enforcement.

Steps:
Expand Down Expand Up @@ -149,4 +152,4 @@ Ollama doesn't currently provide native guardrail capabilities like Bedrock. Ins

* [Amazon Bedrock Guardrails Documentation](https://docs.aws.amazon.com/bedrock/latest/userguide/guardrails.html)
* [Allen Institute for AI: Guardrails Project](https://www.guardrailsai.com/docs)
* [AWS Boto3 Python Documentation](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/bedrock-runtime/client/apply_guardrail.html#)
* [AWS Boto3 Python Documentation](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/bedrock-runtime/client/apply_guardrail.html#)