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Part of https://github.com/langchain-ai/deepagents/issues/2873 --- `SummarizationMiddleware` now serializes the history passed to the summarizer with XML formatting so URL-backed multimodal content remains available in the prompt. The existing behavior avoided dumping raw message metadata into the token budget, but the prefix serialization path omitted image/audio/video URL blocks before the summary model saw them. ## Changes - Update `SummarizationMiddleware._create_summary` and `SummarizationMiddleware._acreate_summary` to call `get_buffer_string(..., format="xml")` for trimmed conversation history - Preserve URL-backed multimodal blocks in the summary prompt while still avoiding raw message metadata expansion - Add sync and async unit coverage with a prompt-capturing chat model to assert image URLs survive summarization input serialization --------- Co-authored-by: Mason Daugherty <mason@langchain.dev> Co-authored-by: Mason Daugherty <github@mdrxy.com>