fix(anthropic): Respect iterator protocol in asynchronous streamed responses

[alexander-alderman-webb]

Description

Close AI Client Spans when anthropic's HTTP connection is closed instead of when the GC collects the private _iterator instance variable. Patch all methods that can close the connection.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• 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

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Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

Anthropic

• Record finish reasons in AI monitoring spans by ericapisani in #5678
• Emit gen_ai.chat spans for asynchronous messages.stream() by alexander-alderman-webb in #5572
• Emit AI Client Spans for synchronous messages.stream() by alexander-alderman-webb in #5565
• Set gen_ai.response.id span attribute by ericapisani in #5662
• Add gen_ai.system attribute to spans by ericapisani in #5661

Pydantic Ai

• Support ImageUrl content type in span instrumentation by ericapisani in #5629
• Add tool description to execute_tool spans by ericapisani in #5596

Other

• (crons) Add owner field to MonitorConfig by julwhitney13 in #5610
• (otlp) Add collector_url option to OTLPIntegration by sl0thentr0py in #5603

Bug Fixes 🐛

Anthropic

• Respect iterator protocol in asynchronous streamed responses by alexander-alderman-webb in #5675

• Respect iterator protocol in synchronous streamed responses by alexander-alderman-webb in #5674
• Close span on GeneratorExit by alexander-alderman-webb in #5643

Other

• (ai) Truncate list-based message content in AI monitoring by ericapisani in #5631
• (celery) Propagate user-set headers by sentrivana in #5581
• (langchain) Wrap finish_reason in array for gen_ai span attribute by ericapisani in #5666
• (profiler) Prevent buffer race condition during rapid start/stop cycles by ericapisani in #5622
• (utils) Avoid double serialization of strings in safe_serialize by ericapisani in #5587
• Enable unused import ruff check and fix unused imports by sentrivana in #5652

Documentation 📚

• (openai-agents) Remove inapplicable comment by alexander-alderman-webb in #5495
• Add AGENTS.md by sentrivana in #5579
• Add set_attribute example to changelog by sentrivana in #5578

Internal Changes 🔧

Anthropic

• Check system and response ID attributes on spans created by stream() by alexander-alderman-webb in #5665
• Skip accumulation logic for unexpected types in streamed response by alexander-alderman-webb in #5564
• Factor out streamed result handling by alexander-alderman-webb in #5563
• Stream valid JSON by alexander-alderman-webb in #5641
• Stop mocking response iterator by alexander-alderman-webb in #5573

Docs

• Remove agentic codebase documentation workflows by dingsdax in #5655
• Switch agentic workflows from Copilot to Claude engine by dingsdax in #5654
• Add agentic workflows for codebase documentation by dingsdax in #5649

Openai Agents

• Do not fail on new tool fields by alexander-alderman-webb in #5625
• Stop expecting a specific function name by alexander-alderman-webb in #5623
• Set streaming header when library uses with_streaming_response() by alexander-alderman-webb in #5583
• Replace mocks with httpx for streamed responses by alexander-alderman-webb in #5580
• Replace mocks with httpx in non-MCP tool tests by alexander-alderman-webb in #5602
• Replace mocks with httpx in MCP tool tests by alexander-alderman-webb in #5605
• Replace mocks with httpx in handoff tests by alexander-alderman-webb in #5604
• Replace mocks with httpx in API error test by alexander-alderman-webb in #5601
• Replace mocks with httpx in non-error single-response tests by alexander-alderman-webb in #5600
• Remove test for unreachable state by alexander-alderman-webb in #5584
• Expect namespace tool field for new openai versions by alexander-alderman-webb in #5599

Other

• (graphene) Simplify span creation by sentrivana in #5648
• (httpx) Resolve type checking failures by alexander-alderman-webb in #5626
• (pyramid) Support alpha suffixes in version parsing by alexander-alderman-webb in #5618
• (rust) Don't implement separate scope management by sentrivana in #5639
• (strawberry) Simplify span creation by sentrivana in #5647
• 🤖 Update test matrix with new releases (03/16) by github-actions in #5671
• Remove custom warden action by sentrivana in #5653
• Add httpx to linting requirements by alexander-alderman-webb in #5644
• Remove CodeQL action by sentrivana in #5616
• Normalize dots in package names in populate_tox.py by alexander-alderman-webb in #5574
• Do not run actions on potel-base by sentrivana in #5614

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Codecov Results 📊

✅ 31 passed | Total: 31 | Pass Rate: 100% | Execution Time: 10.26s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -33
Passed Tests	📉 -33
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

❌ Patch coverage is 0.00%. Project has 15084 uncovered lines.
✅ Project coverage is 27.02%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
anthropic.py	4.47%	⚠️ 534 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    26.18%    27.02%    +0.84%
==========================================
  Files          189       189         —
  Lines        20491     20668      +177
  Branches      6702      6750       +48
==========================================
+ Hits          5364      5584      +220
- Misses       15127     15084       -43
- Partials       463       494       +31

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