Implement Bedrock Guardrail apply_guardrail endpoint support

[Sameerlite]

Title

Implement Bedrock Guardrail apply_guardrail endpoint support

Relevant issues

Fixes LIT-1348

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature

Changes

Summary

This PR implements the missing /guardrails/apply_guardrail endpoint support for Bedrock Guardrails, allowing users to test guardrail performance without making actual LLM calls.

Key Changes

1. Added apply_guardrail method to BedrockGuardrail class

• File: litellm/proxy/guardrails/guardrail_hooks/bedrock_guardrails.py
• Changes:
  • Implemented async def apply_guardrail() method that was missing
  • Added proper Bedrock API integration for testing
  • Handles content blocking and masking scenarios
  • Extracts masked content from Bedrock response output field
  • Includes comprehensive error handling

Example Usage

curl -X POST 'http://localhost:4000/guardrails/apply_guardrail' \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer your-api-key' \
-d '{
    "guardrail_name": "bedrock-content-guard",
    "text": "This message contains sensitive card number 1234 information",
    "language": "en"
}'

# Response:
{
    "response_text": "This message contains sensitive card number {CREDIT_DEBIT_CARD_NUMBER} information"
}

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Oct 24, 2025 9:40am

[ishaan-jaff]

LGTM