chore(langchain): cleanup ruff config

[cbornet]

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Oct 2, 2025 3:55pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32810 will not alter performance

_{Comparing cbornet:langchain_v1-clean-ruff (8df9205) with master (00e547c)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32810 will not alter performance

_{Comparing cbornet:langchain_v1-clean-ruff (8df9205) with master (00e547c)}

Summary

✅ 14 untouched benchmarks

[Copilot]

Pull Request Overview

This PR cleans up the ruff configuration for langchain_v1 by removing outdated per-file ignores and applying various linting fixes across the codebase. The changes include updating ruff version constraints, consolidating linting rules, and implementing hundreds of code quality improvements.

Key Changes:

• Simplified ruff configuration by removing complex per-file ignore patterns
• Updated code to comply with modern Python linting standards including proper import ordering, exception handling, and naming conventions
• Removed unused test utilities and improved type annotations throughout

Reviewed Changes

Copilot reviewed 29 out of 30 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
libs/langchain_v1/pyproject.toml	Updated ruff configuration with simplified rules and version constraints
libs/langchain_v1/tests/unit_tests/stubs.py	Removed entire file containing unused test stub utilities
libs/langchain_v1/tests/unit_tests/embeddings/test_caching.py	Added @OverRide decorators to MockEmbeddings methods
libs/langchain_v1/tests/unit_tests/embeddings/test_base.py	Fixed regex pattern in pytest.raises assertion
libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py	Fixed regex pattern in pytest.raises assertion
libs/langchain_v1/tests/unit_tests/agents/test_tool_node.py	Added periods to docstrings and improved exception handling
libs/langchain_v1/tests/unit_tests/agents/test_return_direct_spec.py	Added keyword-only parameter to _make_tool function
libs/langchain_v1/tests/unit_tests/agents/test_responses_spec.py	Renamed variable from InputModel to input_model for naming consistency
libs/langchain_v1/tests/unit_tests/agents/test_responses.py	Replaced string equality checks with truthiness checks
libs/langchain_v1/tests/unit_tests/agents/test_response_format.py	Improved import ordering and docstring formatting
libs/langchain_v1/tests/unit_tests/agents/test_react_agent.py	Multiple improvements including variable naming, exception handling, and docstring formatting
libs/langchain_v1/tests/unit_tests/agents/test_middleware_agent.py	Improved import ordering and exception handling patterns
libs/langchain_v1/tests/unit_tests/agents/model.py	Added period to docstring
libs/langchain_v1/tests/unit_tests/agents/messages.py	Added noqa comments for function naming conventions
libs/langchain_v1/tests/unit_tests/agents/conftest.py	Changed tuple to set for membership testing
libs/langchain_v1/tests/unit_tests/agents/any_str.py	Added slots definition to AnyStr class
libs/langchain_v1/tests/integration_tests/chat_models/test_base.py	Renamed class from multiply to Multiply for proper naming
libs/langchain_v1/tests/integration_tests/cache/fake_embeddings.py	Added @OverRide decorators to embedding methods
libs/langchain_v1/scripts/check_imports.py	Improved docstring formatting
libs/langchain_v1/langchain/chat_models/base.py	Added @OverRide decorators and improved string splitting logic
libs/langchain_v1/langchain/agents/tool_node.py	Renamed parameter from input to input_ and improved exception handling
libs/langchain_v1/langchain/agents/structured_output.py	Changed tuple to set for membership testing
libs/langchain_v1/langchain/agents/react_agent.py	Improved variable naming and exception handling
libs/langchain_v1/langchain/agents/middleware_agent.py	Improved exception chaining
libs/langchain_v1/langchain/agents/middleware/summarization.py	Improved exception handling patterns
libs/langchain_v1/langchain/agents/middleware/prompt_caching.py	Renamed parameter from type to cache_type and improved exception handling
libs/langchain_v1/langchain/agents/interrupt.py	Reordered Union type arguments
libs/langchain_v1/langchain/_internal/_prompts.py	Reordered Union type arguments
libs/langchain_v1/langchain/init.py	Removed noqa comment for ANN401 rule

[mdrxy]

hmm

[sydney-runkle]

@cbornet happy to try to help move this forward now that we're settled on v1 :)

[cbornet]

@sydney-runkle thanks! I rebased to fix the latest conflicts.

[mdrxy]

Good with me other than the comment

[mdrxy]

Yes, however, the Literal definitions allow for IDE auto-completion/to display a list of valid options. I think this is better DevX even if it isn't the most efficient.

[mdrxy]

off to @sydney-runkle for approval

[cbornet]

Hi @sydney-runkle , can you review this PR ? It applies reordering of the imports so it has a great tendency of conflicting.
I've already rebased it at least 10 times due to conflicts...