feat(checkpoint): serialize pydantic network types #6271
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Motivation
In
langchain‑mcp‑adapters, someToolMessagenon_text_content artifacts (e.g. EmbeddedResource) include Pydantic network fields that are not serializable during checkpointing when used with agents and a checkpointer.Description
Serializes Pydantic network types so
ToolMessagewith MCP artifacts becomes serializable withoutpickle_fallback=True.Issue
#295
Dependencies
No new external dependencies introduced.