The MCP Python SDK 2.0 broke the wrapper libraries. Here's how to spot it and pin back

Automated excerpt

If you're debugging a Rust agent, the Python 2. x story is not your story. If you don't need 2. x features, pin back. I measured the same numbers on both 1. 29. 1 and 2. 2. 0: [] gives 0 blocks, '' gives 1, json. dumps([]) gives 1, ['a','b'] gives 2.

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