Validate a note tool call before saving

Goal

Use Pydantic models to reject malformed note and author fields before a persistence adapter receives them.

Steps

1. Define Author, Note, and SaveNoteResponse models; constrain priority to 1–5 and validate the email field. [source01]
2. Parse the save_note tool input into Note before calling the storage adapter; convert validation failures into a bounded tool error. [source01]
3. Test valid, missing-author, malformed-email, and out-of-range-priority calls; only the valid case reaches persistence. [source01]

How to verify

Send one valid note and three invalid payloads; confirm only the valid call reaches the persistence adapter and the other three return bounded validation errors.

Troubleshooting

If a malformed note is saved, move Pydantic parsing ahead of the adapter call; inspect the rejected field and ensure the error response contains no raw traceback.