fix(mcp): Handle None arguments in tool and prompt handlers

[alexander-alderman-webb]

Description

Just following the types, arguments can be None. For example:

https://github.com/modelcontextprotocol/python-sdk/blob/d060b36e1d095ef6e93e07ba5d59bb69b2ad449a/src/mcp-types/mcp_types/_types.py#L1449-L1453

The prompt case is recorded in the reported issue.

Issues

Closes #7374

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 130596 passed | ⏭️ 7110 skipped | Total: 137706 | Pass Rate: 94.84% | Execution Time: 466m 25s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +32305
Passed Tests	📈 +31674
Failed Tests	—
Skipped Tests	📈 +631

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2509 uncovered lines.
✅ Project coverage is 90.24%. Comparing base (885ac3b) to head (193785c).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/mcp.py	100.00%	⚠️ 2 partials

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
+ Coverage    90.24%    90.24%        —%
==========================================
  Files          193       193         —
  Lines        25724     25713       -11
  Branches      9504      9494       -10
==========================================
+ Hits         23214     23204       -10
- Misses        2510      2509        -1
- Partials      1435      1432        -3

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