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c2e6747176
Claude 4.6+ rejects requests containing consecutive assistant messages, treating the trailing one as an unsupported prefill. This occurs when CrewAgentExecutor appends multiple assistant messages during tool-use iterations in the ReAct loop. Added _merge_consecutive_messages() static method to BaseLLM that merges consecutive same-role messages by joining their text content with double newlines. Messages with list content (tool-use blocks, multimodal) are left untouched. The merge is called in both: - LLM._format_messages_for_provider() for the LiteLLM path - AnthropicCompletion._format_messages_for_anthropic() for native path Added 7 unit tests covering: - Consecutive assistant message merging (LiteLLM and native paths) - Alternating messages preserved - List content not merged - Original messages not mutated - Non-Anthropic models unaffected - Consecutive user messages also merged Fixes #4798 Co-Authored-By: João <joao@crewai.com>