[ssccinng]

Motivation & Context

Tools declaring optional MCP task support can also be called normally. The production fix is already in #9746; this contribution preserves additional regression coverage for arguments, metadata, and successful results.

Description & Review Guide

• Add a non-empty query argument and call metadata to the optional-tool case, and verify they reach the MCP session with the expected result.
• Verify that only task-required tools are omitted and produce the skip warning; ordinary and task-forbidden tools remain callable.
• Preserve the upstream implementation and all existing tests. The change is limited to MCP regression coverage.

Supersedes #9680.

Validation coverage: the MCP tests, core package checks, all five configured core test type checkers, and workspace package checks passed with the pinned tools on Python 3.12 and Python 3.11.

Validation: The additional regression coverage passes on the current target branch. The listed validation commands passed. The same configured checks also passed with Python 3.11.

Related Issue

Fixes #9675.

AI Assistance

• No material AI assistance was used.
• This is an AI-assisted contribution. I reviewed, understood, and verified all submitted content and accept responsibility for it.

AI assistance details: Implementation, regression coverage, and review were AI-assisted.

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR links to an agreed issue with no competing open PR, or documents the applicable exception
• This is not a breaking change.

[Copilot]

🟢 Approval recommended

No active review issues are reported for this test-only expansion of optional-task MCP regression coverage.

No open issues 🎉

What changed in this PR

This PR strengthens Python MCP regression coverage for the optional-task tool behavior restored in #9746. It changes tests only, leaving production behavior unchanged.

Changes:

• Verify that optional tools forward a non-empty query argument and tool metadata and return the expected result.
• Check exact parameter mappings and confirm required-task tools remain excluded.
• Assert that only required-task tools produce a skip warning, while forbidden-task and ordinary tools remain callable.

File	Description
python/​packages/​core/​tests/​core/​test_mcp.py	Expands assertions for MCP tool discovery, argument and metadata forwarding, warnings, and successful invocation.

_{Review effort: Balanced}