chore(langchain): add ruff rule E501 in langchain_v1

[cbornet]

No description provided.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Sep 8, 2025 9:25pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32812 will not alter performance

_{Comparing cbornet:ruff-langchain_v1-e501 (4818a8c) with master (54c2419)}

⚠️ 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 #32812 will not alter performance

_{Comparing cbornet:ruff-langchain_v1-e501 (4818a8c) with master (54c2419)}

Summary

✅ 14 untouched benchmarks

[Copilot]

Pull Request Overview

This PR enforces the E501 (line too long) linting rule for the langchain/agents/* directory by removing the rule exception and reformatting all long lines to comply with the length limit.

• Removes E501 exception from the pyproject.toml configuration
• Splits long string literals and function arguments across multiple lines
• Reformats docstrings and comments to respect line length limits

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
libs/langchain_v1/pyproject.toml	Removes E501 exception for agents directory
libs/langchain_v1/langchain/agents/tool_node.py	Reformats long strings, comments, and error messages
libs/langchain_v1/langchain/agents/structured_output.py	Splits long docstrings and error messages
libs/langchain_v1/langchain/agents/react_agent.py	Reformats extensive docstrings and error messages
libs/langchain_v1/langchain/agents/middleware/types.py	Splits long docstring
libs/langchain_v1/langchain/agents/middleware/summarization.py	Adds noqa comment for template string
libs/langchain_v1/langchain/agents/middleware/prompt_caching.py	Reformats docstrings and error messages
libs/langchain_v1/langchain/agents/middleware/human_in_the_loop.py	Splits long error message strings
libs/langchain_v1/langchain/agents/interrupt.py	Reformats docstring structure