Python 3.14 compatibility issue with aws-iac-mcp-server due to Pydantic V1 dependencies #2056
Description
Description
The aws-iac-mcp-server fails to run on Python 3.14 due to a RuntimeError related to deprecated Pydantic V1 API usage in its dependencies.
Error
RuntimeError: pydantic.v1.fields.UndefinedType
Root Cause
The issue stems from dependencies samtranslator and cfnlint that still use the deprecated Pydantic V1 API, which is no longer compatible with Python 3.14.
Impact
- Prevents aws-iac-mcp-server from running on Python 3.14
- Blocks users who have upgraded to the latest Python version
- Affects compatibility with modern Python environments
Expected Behavior
The aws-iac-mcp-server should work seamlessly with Python 3.14.
Suggested Solution
Update dependencies to versions that support Pydantic V2 or implement compatibility shims for the transition period.
Labels Needed
Please add the following labels: bug, python-3.14, pydantic, compatibility