[Pierre-Yves Le Borgne (pylaterreur)]

Summary

Follow-up to #834. VCR.py 8.5.0 is out with kevin1024/vcrpy#1055, which fixes kevin1024/vcrpy#502 (an aiohttp response streamed while recording came back empty) and kevin1024/vcrpy#927 (a replayed response.content restarted on each access, so google-genai's readline() loop never ended). Since #834, _patch_vcr_aiohttp_stubs() in py/src/braintrust/conftest.py skips its patches for those on such releases, and its docstring says to delete them once uv.lock has one.

Changes

• Add vcrpy>=8.5.0 to the test dependency group. Since chore(deps): weekly dependency update #998, uv.lock already has VCR.py 9.2.0 on Python 3.11 and newer, and 8.5.0 on Python 3.10, which VCR.py 9 doesn't support; it only gains the new requirement.
• Remove the patches for problems 1, 3 and 4 (cached content, no-op MockStream.set_exception, record_response replacement), and the shims that only older VCR.py needed: the AsyncStreamReaderMixin placeholder, the stream_writer constructor and MockStream.iter_chunked. VCR.py 8.5.0 does all of these itself. The gzip decoding in text() and read() stays.
• This no longer moves the exclude-newer cutoff: it's rebased onto chore(deps): weekly dependency update #998, whose cutoff (2026-10-26T06:02:31Z) already covers 9.2.0. On the old base, the cutoff the earlier push set (2026-10-25T22:30:00Z) also let test_pydantic_ai_integration(latest) install anthropic 2.3.0 next to the old pydantic-ai==2.57.0 pin. Anthropic 2 made BetaMessageParam a Union, so test_agent_run_anthropic_reasoning_tokens failed with TypeError: Cannot instantiate typing.Union in the previous CI run; chore(deps): weekly dependency update #998 moved the pin to 2.61.0, which works with it.

VCR.py 9.0 has some breaking changes (release notes). Nothing in this repo matches on the CannotOverwriteExistingCassetteException message or uses filter_post_data_parameters, and the sessions below pass with 9.2.0.

Testing

nox sessions as CI runs them (uv run --project ./py nox -f ./py/noxfile.py -s ..., Python 3.12, cassette replay):

Session	main (VCR.py 9.2.0 since #998)	this PR
test_litellm(latest)	43 passed	43 passed
test_litellm(1.74.0)	30 passed, 13 skipped	30 passed, 13 skipped
test_dspy(latest)	15 passed	15 passed
test_google_genai(latest)	44 passed, 2 skipped	44 passed, 2 skipped
test_huggingface_hub(0.32.0)	17 passed, 2 skipped	17 passed, 2 skipped
test_google_adk(latest)	16 passed	16 passed
test_google_adk(2.6.3)	13 passed, 3 skipped	13 passed, 3 skipped
test_google_adk(1.14.1)	13 passed, 3 skipped	13 passed, 3 skipped

All six of CI's nox shards for Python 3.12 on Linux (py/scripts/nox-matrix.py <n> 6 --python-version 3.12 --os ubuntu-24.04 --exclude-static-checks --exclude-session test_api_codegen) pass on this branch, as on main: 90 sessions, with the same installed packages in every session. On Python 3.10, where the lock has 8.5.0, the 3.10 shards pass too (75 sessions), and test_litellm(1.74.0), test_google_genai(latest) and test_huggingface_hub(0.32.0) have the same counts as above. test_pydantic_ai_integration(latest) passes on Python 3.11 to 3.15 (61 passed).

These replays don't reach the bugs the patches were for: without the patches, test_litellm (both versions), test_dspy(latest), test_google_genai(latest) and test_google_adk(latest) also pass on VCR.py 8.4.0. test_google_genai has no aiohttp, since google-genai makes it optional. With aiohttp added to test_google_genai(latest), as with google-genai[aiohttp], this PR on VCR.py 8.4.0 hangs in test_basic_completion[async_stream] (kevin1024/vcrpy#927). It passes on 8.5.0 (44 passed, 2 skipped), as main does on 8.4.0.

Pre-commit hooks pass on the changed files, and pylint --errors-only is clean on conftest.py.

🤖 Generated with Claude Code

https://claude.ai/code/session_01GwUvhmzgfkiZ6vo4uGyesN

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-25T22:41:02.474334Z	e86691e	PR opened

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[Abhijeet Prasad (AbhiPrasad)]

thanks Pierre-Yves Le Borgne (@pylaterreur)