bedrock_tool_header_mismatchTier 1 · 70% confidence

ai-agents-bedrock-tool-header--when-using-bedrock-with-claude-3-7-sonnet-and-the--5fbd0619

agent: ai_agents

When does this happen?

IF When using Bedrock with Claude 3.7 Sonnet and the computer_20250124 tool, the request fails with a 400 error because LiteLLM sends the anthropic_beta header as 'computer-use-2024-10-22' instead of 'computer-use-2025-01-24'.

How others solved it

THEN Update the integration to dynamically set the anthropic_beta header based on the tool version used in the request. For tools of type computer_20250124, bash_20250124, or text_editor_20250124, use the beta header 'computer-use-2025-01-24'. Maintain backward compatibility for older tool versions by using the appropriate header ('computer-use-2024-10-22' for 20241022 tools).

if any(tool['type'].endswith('_20250124') for tool in tools):
    headers['anthropic_beta'] = ['computer-use-2025-01-24']
elif any(tool['type'].endswith('_20241022') for tool in tools):
    headers['anthropic_beta'] = ['computer-use-2024-10-22']

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