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- Add LLM.supports_assistant_prefill() to detect Anthropic models that reject trailing assistant messages (Claude 4.6+) - Add CrewAgentExecutor._append_assistant_response() to split the observation into a separate user-role message for no-prefill models, ensuring the conversation never ends with an assistant turn - Drop the temperature parameter for Claude 4.6+ models that reject it - Add 17 unit tests covering detection, temperature dropping, and message splitting behaviour Co-Authored-By: João <joao@crewai.com>