[Anish Mehta (anishmehta24)]

Motivation and Context

KernelJsonSchemaBuilder treats tuple[int, ...] as a two-item tuple whose second item is the Ellipsis, so a function parameter typed that way gets this schema:

{"type": "array", "items": [{"type": "integer"}, {"type": "object"}]}

The model is told the argument is exactly one integer followed by an object, instead of a list of integers.

Description

When the tuple's arguments are (X, Ellipsis), build {"type": "array", "items": <schema of X>}, the same as list[X]. Fixed-length tuples like tuple[int, str] keep their per-position items. Added tests for tuple[int, ...] and Optional[tuple[str, ...]]; both fail on main.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

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