Add Support for Bedrock Guardrails to supportive selective Guarding

[Sameerlite]

Bedrock GuardrailConverseContent Support Implementation

Relevant issues

Fixes #12676

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

Local Test

Type

🆕 New Feature
🐛 Bug Fix

Changes

1. litellm/litellm/types/llms/bedrock.py

   • Added GuardrailConverseContentBlock type definition
   • Updated ContentBlock to include guardrailConverseContent field

2. litellm/litellm/litellm_core_utils/prompt_templates/factory.py

   • Updated _bedrock_converse_messages_pt function to support guarded_text content type
   • Updated _bedrock_converse_messages_pt_async function for async support
   • Added logic to wrap guarded_text content in GuardrailConverseContent blocks

Features Implemented

When guarded_text content type is encountered:

1. The text content is extracted from the guarded_text block
2. A new BedrockContentBlock is created with guardrailConverseContent field
3. The content is wrapped as: {"guardrailConverseContent": {"text": "..."}}
4. Other content types (text, image_url, etc.) are processed normally

Usage:

import litellm
from litellm import completion

messages = [
    {
        "role": "system",
        "content": "You are a helpful AI assistant."
    },
    {
        "role": "user",
        "content": [
            {"type": "text", "text": "What is the main topic of this legal document?"},
            {"type": "guarded_text", "text": "This is a set of very long instructions that you will follow. Here is a legal document that you will use to answer the user's question."}
        ]
    }
]

response = completion(
    model="bedrock/converse/us.amazon.nova-pro-v1:0",
    messages=messages,
    guardrailConfig={
        "guardrailIdentifier": "gr-abc123",
        "guardrailVersion": "DRAFT"
    }
)

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Sep 16, 2025 6:21pm

[ishaan-jaff]

reviewed