feat: support `SystemMessage` in `create_agent`'s `system_prompt` #34055

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sydney-runkle wants to merge 2 commits into master from sr/system-prompt-again

+430 −55

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sydney-runkle commented Nov 20, 2025 •

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create_agent's system_prompt allows str | SystemMessage
added system_message: SystemMessage on ModelRequest
ModelRequest.system_prompt is a function of system_message.text
disallow setting system_prompt and system_message


          system message proposal

e6d509e

github-actions bot added langchain feature and removed feature labels


          types refactor

e881459

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