fix(bedrock): restore parallel_tool_calls mapping in map_openai_params

[jquinter]

Summary

• The revert in 8565c70e53 removed parallel_tool_calls handling from map_openai_params
• The subsequent fix d0445e1e33 only re-added the transform_request consumption (with is_claude_4_5_on_bedrock guard) but forgot to re-add the map_openai_params producer that sets _parallel_tool_use_config
• This meant parallel_tool_calls=False was silently ignored for all Bedrock models
• Restores both the supported params entry and the map_openai_params handler

Test plan

• test_parallel_tool_calls_newer_model_adds_disable_flag passes
• test_parallel_tool_calls_older_model_drops_disable_flag passes
• CI passes

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Project	Deployment	Actions	Updated (UTC)
litellm	Building	Preview, Comment	Feb 28, 2026 1:56am

[greptile-apps]

Greptile Summary

This PR restores the parallel_tool_calls parameter handling in Bedrock's map_openai_params that was lost during a revert/fix cycle (8565c70e reverted the original fix, and d0445e1e only re-added the transform_request consumer but not the map_openai_params producer). Without this fix, parallel_tool_calls=False was silently ignored for all Bedrock models.

• Adds "parallel_tool_calls" back to get_supported_openai_params return list
• Restores the map_openai_params handler that converts parallel_tool_calls to _parallel_tool_use_config (the internal representation consumed by transform_request)
• Updates realtime streaming guardrail test assertions to match the current behavior where guardrails inject violation voice messages (response.cancel + conversation.item.create + response.create) rather than simply blocking responses
• Both the newer-model and older-model test cases pass, verifying the is_claude_4_5_on_bedrock guard correctly gates the feature

Confidence Score: 5/5

• This PR is safe to merge — it restores previously working functionality with proper test coverage.
• The bedrock change is a straightforward restoration of code that was accidentally removed during a revert cycle. The implementation matches the established pattern for param handling in map_openai_params, and the transform_request consumer (with is_claude_4_5_on_bedrock guard) was already in place on main. Two dedicated tests verify both the newer-model and older-model paths. The realtime streaming test updates are assertion adjustments that align with current guardrail behavior.
• No files require special attention

Important Files Changed

Filename	Overview
litellm/llms/bedrock/chat/converse_transformation.py	Restores parallel_tool_calls to supported params list and adds the map_openai_params handler that converts it to _parallel_tool_use_config. Clean, correct fix that matches the existing pattern used by other param handlers in the same method.
tests/test_litellm/litellm_core_utils/test_realtime_streaming.py	Updates realtime guardrail test assertions to match new behavior where guardrails inject violation messages (response.cancel + conversation.item.create + response.create) instead of simply blocking. All tests use mocks, no network calls.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["User passes parallel_tool_calls=False"] --> B["get_supported_openai_params"]
    B -->|"'parallel_tool_calls' in list"| C["map_openai_params"]
    C -->|"Sets _parallel_tool_use_config"| D["optional_params"]
    D --> E["transform_request"]
    E --> F{"is_claude_4_5_on_bedrock?"}
    F -->|Yes| G["Merge into additionalModelRequestFields\n(disable_parallel_tool_use: true)"]
    F -->|No| H["Drop _parallel_tool_use_config\n(older models don't support it)"]
    G --> I["Send to Bedrock API"]
    H --> I

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