Developer fixes confusing smolagents crash when serializing agents with MCP tools

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A contributor named himanshu748 identified and patched a bug in Hugging Face's smolagents framework, a popular open-source agent library with over 28,000 GitHub stars. The bug caused a cryptic ValueError whenever developers called to_dict(), save(), or push_to_hub() on a CodeAgent holding MCP tools, with error messages referencing undefined variables the user never wrote. The root cause was that smolagents attempted to reconstruct standalone Python source code for MCP tools, which are generated at runtime inside closures tied to live server sessions and cannot be serialized that way. The fix, submitted as pull request #2528 addressing issue #1108, extends an existing guard clause to detect MCP tools early and raise a clear, actionable error message explaining how to remove and recreate them properly. The patch was developed as part of DEV Community's Summer Bug Smash challenge, with Sentry used to assist in tracing the error path.

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