LangChain deepagentsjs 1.14.2 adds binary content offloading and unsupported-content middleware
LangChain released deepagentsjs 1.14.2. FilesystemMiddleware gains an offloadBinaryContent option that writes binary read_file content and inline HumanMessage media to /blobs, replacing them in checkpointed state with references rehydrated per run. A new UnsupportedContentMiddleware swaps model-rejected input for a text placeholder before each call, and createDeepAgent adds it automatically.
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Summary last validated Oct 11, 2026
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