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docs(bedrock): add guardrail_lastest_message docs #340

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cc7b654
docs(bedrock): add guardrail_last_turn_only docs
aianch Nov 21, 2025
9bbb0d9
docs(bedrock): include assistant response in guardrail_last_turn_only…
aianch Nov 21, 2025
ceffd58
Merge branch 'main' into guardrail-last-turn
JackYPCOnline Dec 17, 2025
69a4fcc
docs: fix guardrail parameter name to match SDK implementation
aianch Jan 7, 2026
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12 changes: 4 additions & 8 deletions docs/user-guide/concepts/model-providers/amazon-bedrock.md
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Expand Up @@ -369,10 +369,6 @@ For a complete list of input types, please refer to the [API Reference](../../..

Amazon Bedrock supports guardrails to help ensure model outputs meet your requirements. Strands allows you to configure guardrails with your [`BedrockModel`](../../../api-reference/models.md#strands.models.bedrock):

```python
from strands import Agent
from strands.models import BedrockModel

# Using guardrails with BedrockModel
bedrock_model = BedrockModel(
model_id="anthropic.claude-sonnet-4-20250514-v1:0",
Expand All @@ -383,9 +379,10 @@ For a complete list of input types, please refer to the [API Reference](../../..
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_latest_message=False # Default: False - Set to True to evaluate only the latest user message
)

guardrail_agent = Agent(model=bedrock_model)

response = guardrail_agent("Can you tell me about the Strands SDK?")
Expand All @@ -398,10 +395,10 @@ For a complete list of input types, please refer to the [API Reference](../../..
- 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
- Latest message only (disabled by default): When enabled, only the latest user message (text and image content) is wrapped for guardrail evaluation instead of the full conversation history. This can help conversations recover after guardrail interventions and reduces evaluation overhead.

{{ ts_not_supported_code("Guardrails are not yet supported in the TypeScript SDK") }}


### Caching

Strands supports caching system prompts, tools, and messages to improve performance and reduce costs. Caching allows you to reuse parts of previous requests, which can significantly reduce token usage and latency.
Expand Down Expand Up @@ -834,4 +831,3 @@ This is very likely due to calling Bedrock with an inference model id, such as:
- [Amazon Bedrock Documentation](https://docs.aws.amazon.com/bedrock/)
- [Bedrock Model IDs Reference](https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids.html)
- [Bedrock Pricing](https://aws.amazon.com/bedrock/pricing/)

3 changes: 3 additions & 0 deletions docs/user-guide/safety-security/guardrails.md
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Expand Up @@ -35,6 +35,7 @@ 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_latest_message=False, # Set to True to evaluate only the latest user message
)

# Create agent with the guardrail-protected model
Expand All @@ -53,6 +54,8 @@ if response.stop_reason == "guardrail_intervened":
print(f"Conversation: {json.dumps(agent.messages, indent=4)}")
```

**Performance Optimization**: Set `guardrail_latest_message=True` to evaluate only the latest user message instead of the full conversation history. This can help conversations recover after guardrail interventions and reduces evaluation overhead. 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