14│ ├── core/ # `langchain-core` primitives and base abstractions
15│ ├── langchain/ # `langchain-classic` (legacy, no new features)
16▶│ ├── langchain_v1/ # Actively maintained `langchain` package
17│ ├── partners/ # Third-party integrations
18│ │ ├── openai/ # OpenAI models and embeddings
· · ·
19│ │ ├── anthropic/ # Anthropic (Claude) integration
20│ │ ├── ollama/ # Local model support
21▶│ │ └── ... (other integrations maintained by the LangChain team)
22│ ├── text-splitters/ # Document chunking utilities
23│ ├── standard-tests/ # Shared test suite for integrations
· · ·
30- **Core layer** (`langchain-core`): Base abstractions, interfaces, and protocols. Users should not need to know about this layer directly.
31- **Implementation layer** (`langchain`): Concrete implementations and high-level public utilities
32▶- **Integration layer** (`partners/`): Third-party service integrations. Note that this monorepo is not exhaustive of all LangChain integrations; some are maintained in separate repos, such as `langchain-ai/langchain-google` and `langchain-ai/langchain-aws`. Usually these repos are cloned at the same level as this monorepo, so if needed, you can refer to their code directly by navigating to `../langchain-google/` from this monorepo.
33- **Testing layer** (`standard-tests/`): Standardized integration tests for partner integrations
34
· · ·
85#### Key config files
86
87▶- pyproject.toml: Main workspace configuration with dependency groups
88- uv.lock: Locked dependencies for reproducible builds
89- Makefile: Development tasks
· · ·
91#### PR and commit titles
92
93▶Follow Conventional Commits. See `.github/workflows/pr_lint.yml` for allowed types and scopes. All titles must include a scope with no exceptions — even for the main `langchain` package.
94
95- Start the text after `type(scope):` with a lowercase letter, unless the first word is a proper noun (e.g. `Azure`, `GitHub`, `OpenAI`) or a named entity (class, function, method, parameter, or variable name).
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