[Jae Bird (jaeminbird)]

Motivation and Context

MCP prompts are loaded with every argument marked required, ignoring PromptArgument.required (optional; absent means not required). The function-calling schema then lists all of them as required, and invoking the prompt without an optional argument fails with "Parameter style is required but not provided in the arguments."

Description

Use bool(prompt_argument.required).

• New test: required/optional/absent arguments map to True/False/False, and invoking with only the required one sends arguments={"code": ...}; fails before, passes after.
• tests/unit/connectors/mcp, tests/unit/functions and tests/unit/kernel pass; ruff and mypy clean.

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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