3b458bfb4d
AgentRuntime gains model_name and tools fields populated by create_agent at wire time. A private _build_runtime hook on AgentMiddleware lets subpackages (e.g. deepagents) return an enriched runtime subclass from their middleware without exposing those fields in LangChain. All four middleware hook nodes (before_agent, before_model, after_model, after_agent) now receive AgentRuntime instead of the bare LangGraph Runtime; existing Runtime annotations remain valid via Liskov substitution.
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.