Files
langchain/libs
Harrison Chase bda22aa1d9 fix(langchain): handle parallel usage of the todo tool in planning middleware (#34637)
The agent should only make a single call to update the todo list at a
time. A parallel call doesn't make sense, but also cannot work as
there's no obvious reducer to use.

On parallel calls of the todo tool, we return ToolMessage containing to
guide the LLM to not call the tool in parallel.

---------

Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
2026-01-07 17:23:56 -05:00
..
2026-01-07 14:34:23 -05:00

Packages

Important

View all LangChain integrations packages

This repository is structured as a monorepo, with various packages located in this libs/ directory. Packages to note in this directory include:

core/             # Core primitives and abstractions for langchain
langchain/        # langchain-classic
langchain_v1/     # langchain
partners/         # Certain third-party providers integrations (see below)
standard-tests/   # Standardized tests for integrations
text-splitters/   # Text splitter utilities

(Each package contains its own README.md file with specific details about that package.)

Integrations (partners/)

The partners/ directory contains a small subset of third-party provider integrations that are maintained directly by the LangChain team. These include, but are not limited to:

Most integrations have been moved to their own repositories for improved versioning, dependency management, collaboration, and testing. This includes packages from popular providers such as Google and AWS. Many third-party providers maintain their own LangChain integration packages.

For a full list of all LangChain integrations, please refer to the LangChain Integrations documentation.