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search Middleware Classes Text Editor Tools - StateClaudeTextEditorToolMiddleware: In-memory text editor using agent state - FilesystemClaudeTextEditorToolMiddleware: Text editor operating on real filesystem Implementing Claude's text editor tools https://docs.claude.com/en/docs/agents-and-tools/tool-use/text-editor-tool Operations: view, create, str_replace, insert Memory Tools - StateClaudeMemoryToolMiddleware: Memory persistence in agent state - FilesystemClaudeMemoryToolMiddleware: Memory persistence on filesystem Implementing Claude's memory tools https://docs.claude.com/en/docs/agents-and-tools/tool-use/memory-tool Operations: Same as text editor plus delete and rename File Search Tools - StateFileSearchMiddleware: Search state-based files - FilesystemFileSearchMiddleware: Search real filesystem Provides Glob and Grep tools with same schema as used by Claude Code (but compatible with any model) - Glob: Pattern matching (e.g., **/*.py, src/**/*.ts), sorted by modification time - Grep: Regex content search with output modes (files_with_matches, content, count) Usage ``` from langchain.agents import create_agent from langchain.agents.middleware import ( StateTextEditorToolMiddleware, StateFileSearchMiddleware, ) agent = create_agent( model=model, tools=[], middleware=[ StateTextEditorToolMiddleware(), StateFileSearchMiddleware(), ], ) ```
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.