chore(mcp): Stop setting mcp.tool.result.content_count

[alexander-alderman-webb]

Description

Stop setting mcp.tool.result.content_count since the length can be determined from the value of the gen_ai.tool.call.result attribute.

See deprecation in getsentry/sentry-conventions@b06e641

Issues

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 📊

✅ 54978 passed | ❌ 1 failed | ⏭️ 2727 skipped | Total: 57706 | Pass Rate: 95.27% | Execution Time: 153m 22s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -82679
Passed Tests	📉 -78184
Failed Tests	—
Skipped Tests	📉 -4495

➕ New Tests (1)

View new tests

• test_cache_spans_item_size
  • File: tests.integrations.django.test_cache_module
  • Status: ❌ Failing

➖ Removed Tests (1)

View removed tests

• test_cache_spans_decorator[True]
  • File: tests.integrations.django.test_cache_module

❌ Failed Tests

test_cache_spans_item_size

File: tests.integrations.django.test_cache_module
Suite: py3.14-django-v5.2.17
Error: tests/integrations/django/test_cache_module.py:546: in test_cache_spans_item_size assert not spans[0]["attributes"]["cache.hit"] E assert not True

Stack Trace

tests/integrations/django/test_cache_module.py:546: in test_cache_spans_item_size
    assert not spans[0]["attributes"]["cache.hit"]
E   assert not True

✅ Patch coverage is 100.00%. Project has 2061 uncovered lines.
❌ Project coverage is 90.03%. Comparing base (25a4a32) to head (e8dfa37).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
- Coverage    90.38%    90.03%    -0.35%
==========================================
  Files          202       185       -17
  Lines        26552     20672     -5880
  Branches      9858      7114     -2744
==========================================
+ Hits         23997     18611     -5386
- Misses        2555      2061      -494
- Partials      1487      1216      -271

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