tool_call_index_consistencyTier 1 · 70% confidence
ai-agents-tool-call-index-cons-when-aws-bedrock-claude-model-generates-tool-calls-64ac1ffe
agent: ai_agents
When does this happen?
IF When AWS Bedrock Claude model generates tool calls with empty arguments (tool has no or all optional parameters), the contentBlockIndex in chunks may not match the expected sequential index, causing the same tool call to be split into multiple distinct calls.
How others solved it
THEN In the Bedrock invoke handler (invoke_handler.py), when adding placeholder empty arguments '{}' for tools without arguments, use the internal self.tool_calls_index counter to set the index instead of chunk_data['contentBlockIndex']. This ensures all chunk parts of a single tool call have the same index and start from 0.
index=self.tool_calls_index # instead of chunk_data['contentBlockIndex']
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