## Environment - LiteLLM version: 1.85.0 - Model: `us.meta.llama4-maverick-17b-instruct-v1:0` (cross-region inference profile) - Provider: AWS Bedrock Converse API - LiteLLM config: bedrock/converse/us.meta.llama4-maverick-17b-instruct-v1:0

## Steps to reproduce 1. Configure LiteLLM proxy with llama4-maverick via bedrock/converse/us.meta.* 2. Send a request that includes any tool/function definition 3. Request fails immediately before the model generates any output

## Error LiteLLM returns HTTP 500 with: `litellm.APIConnectionError: BedrockException - {"Message":"..."}`

The calling application (OpenClaw) reports: `FailoverError: LLM request failed: provider rejected the request schema or tool payload.`

## Root cause hypothesis Bedrock enforces strict JSON Schema draft 2020-12 validation on tool definitions for Llama 4 cross-region inference profiles. The tool schema format LiteLLM sends for openai-completions-compatible tool calls may not pass Bedrock's validation.

Interestingly, Nova models (amazon.nova-micro-v1:0) accept the same tool definitions without issue — this appears specific to Llama 4 cross-region inference profiles.

## Expected behavior Tool calls should work wi…