e2da14595b
- get_child(): pass state directly to constructor instead of calling set_handlers/add_tags/add_metadata sequentially (-22%) - add_tags(): use set-based dedup instead of O(n) list scans per tag, early return when tags list is empty (-70% on duplicate tags) - handle_event/ahandle_event: early return when handlers list is empty - _configure(): skip throwaway CallbackManager construction on the common path where inheritable_callbacks is provided These are the top bottlenecks identified by profiling langgraph's react_agent benchmark, where langchain_core callbacks account for ~35% of runtime. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Packages
Important
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.