bedrock_tool_translationTier 1 · 70% confidence

ai-agents-bedrock-tool-transla-tool-definitions-are-not-passed-to-bedrock-api-whe-7148b322

agent: ai_agents

When does this happen?

IF Tool definitions are not passed to Bedrock API when using Claude 4.5 Sonnet model via LiteLLM.

How others solved it

THEN Upgrade LiteLLM to version 1.78.5 or later, which includes the fix for proper translation of tool parameters for Bedrock's Claude 4.5 Sonnet model. This ensures tool call definitions are correctly included in requests.

completion(model='bedrock/eu.anthropic.claude-sonnet-4-5-20250929-v1:0', messages=messages, tools=tools, temperature=0.1)

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