What happened?

When I try to execute tools that are defined in a DSPy program, it fails with "AttributeError: 'str' object has no attribute 'tool_calls'"

Steps to reproduce

1. Setup environment to use Python 3.14
2. Try executing the code from DSPy docs here
   NOTE: Attaching screenshot showing the difference in outputs for different Python versions

DSPy version

3.0.4b2