Add README for community + core

README.md

@@ -3,7 +3,7 @@
 ⚡ Building applications with LLMs through composability ⚡
 
 [![CI](https://github.com/langchain-ai/langchainjs/actions/workflows/ci.yml/badge.svg)](https://github.com/langchain-ai/langchainjs/actions/workflows/ci.yml) ![npm](https://img.shields.io/npm/dw/langchain) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchainai.svg?style=social&label=Follow%20%40LangChainAI)](https://twitter.com/langchainai) [![](https://dcbadge.vercel.app/api/server/6adMQxSpJS?compact=true&style=flat)](https://discord.gg/6adMQxSpJS) [![Open in Dev Containers](https://img.shields.io/static/v1?label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode)](https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url=https://github.com/langchain-ai/langchainjs)
-[<img src="https://github.com/codespaces/badge.svg" title="Open in Github Codespace" width="150" height="20">](https://codespaces.new/hwchase17/langchainjs)
+[<img src="https://github.com/codespaces/badge.svg" title="Open in Github Codespace" width="150" height="20">](https://codespaces.new/langchain-ai/langchainjs)
 
 Looking for the Python version? Check out [LangChain](https://github.com/langchain-ai/langchain).
 

langchain-core/README.md

@@ -1,21 +1,24 @@
-# 🦜️🔗 @langchain/core
+# 🦜🍎️ @langchain/core
 
-:::note
-This package is experimental at the moment and may change.
-:::
+[![CI](https://github.com/langchain-ai/langchainjs/actions/workflows/ci.yml/badge.svg)](https://github.com/langchain-ai/langchainjs/actions/workflows/ci.yml) ![npm](https://img.shields.io/npm/dw/@langchain/core) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchainai.svg?style=social&label=Follow%20%40LangChainAI)](https://twitter.com/langchainai) [![](https://dcbadge.vercel.app/api/server/6adMQxSpJS?compact=true&style=flat)](https://discord.gg/6adMQxSpJS)
 
 `@langchain/core` contains the core abstractions and schemas of LangChain.js, including base classes for language models,
 chat models, vectorstores, retrievers, and runnables.
 
-## 🔧 Usage
-
-Install core like this:
+## 💾 Quick Install
 
 ```bash
 $ yarn add @langchain/core
 ```
 
-Then, you can install other provider-specific packages like this:
+## 🤔 What is this?
+
+`@langchain/core` contains the base abstractions that power the rest of the LangChain ecosystem. 
+These abstractions are designed to be as modular and simple as possible.
+Examples of these abstractions include those for language models, document loaders, embedding models, vectorstores, retrievers, and more.
+The benefit of having these abstractions is that any provider can implement the required interface and then easily be used in the rest of the LangChain ecosystem.
+
+For example, you can install other provider-specific packages like this:
 
 ```bash
 $ yarn add @langchain/openai
@@ -66,11 +69,44 @@ leigh
 ```
 
 Note that for compatibility, all used LangChain packages (including the base LangChain package, which itself depends on core!) must share the same version of `@langchain/core`.
-This means that you may need to install a specific version of `@langchain/core` that matches the dependencies of your used packages.
+This means that you may need to install/resolve a specific version of `@langchain/core` that matches the dependencies of your used packages.
+
+## 🔗 What is LangChain Expression Language?
+
+LangChain Core also contains LangChain Expression Language, or LCEL, a runtime that allows users to compose arbitrary sequences together and get several benefits that are important when building LLM applications.
+We call these sequences “runnables”.
+
+All runnables expose the same interface with single-invocation, batch, streaming and async methods.
+This design is useful because it is not enough to have a single sync interface when building an LLM application.
+Batch is needed for efficient processing of many inputs.
+Streaming (and streaming of intermediate steps) is needed to show the user that progress is being made.
+Async interfaces are nice when moving into production.
+Rather than having to write multiple implementations for all of those, LCEL allows you to write a runnable once and invoke it in many different ways.
+
+For more check out the [LCEL docs](https://js.langchain.com/docs/expression_language/).
+
+![LangChain Stack](../docs/core_docs/static/img/langchain_stack.png)
+
+## 📕 Releases & Versioning
+
+`@langchain/core` is currently on version `0.1.x`.
+
+As `@langchain/core` contains the base abstractions and runtime for the whole LangChain ecosystem, we will communicate any breaking changes with advance notice and version bumps. The exception for this is anything in `@langchain/core/beta`. The reason for `@langchain/core/beta` is that given the rate of change of the field, being able to move quickly is still a priority, and this module is our attempt to do so.
+
+Minor version increases will occur for:
+
+- Breaking changes for any public interfaces NOT in `@langchain/core/beta`
+
+Patch version increases will occur for:
+
+- Bug fixes
+- New features
+- Any changes to private interfaces
+- Any changes to `@langchain/core/beta`
 
 ## 📦 Creating your own package
 
-Other LangChain packages should add this package as a dependency and extend the classes within. 
+Other LangChain packages should add this package as a dependency and extend the classes within.
 For an example, see the [@langchain/anthropic](https://github.com/langchain-ai/langchainjs/tree/main/libs/langchain-anthropic) in this repo.
 
 Because all used packages must share the same version of core, we suggest using a tilde dependency to allow for different (backwards-compatible) patch versions:
@@ -92,8 +128,6 @@ Because all used packages must share the same version of core, we suggest using
 
 This recommendation will change to a caret once a major version (1.x.x) release has occurred.
 
-API reference docs for core are in progress. For now we recommend looking directly at the source code to find the necessary abstractions for your use case.
-
 We suggest making all packages cross-compatible with ESM and CJS using a build step like the one in 
 [@langchain/anthropic](https://github.com/langchain-ai/langchainjs/tree/main/libs/langchain-anthropic), then running `yarn build` before running `npm publish`.
 

libs/langchain-community/README.md

@@ -0,0 +1,27 @@
+# 🦜️🧑‍🤝‍🧑 LangChain Community
+
+[![CI](https://github.com/langchain-ai/langchainjs/actions/workflows/ci.yml/badge.svg)](https://github.com/langchain-ai/langchainjs/actions/workflows/ci.yml) ![npm](https://img.shields.io/npm/dw/@langchain/community) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchainai.svg?style=social&label=Follow%20%40LangChainAI)](https://twitter.com/langchainai) [![](https://dcbadge.vercel.app/api/server/6adMQxSpJS?compact=true&style=flat)](https://discord.gg/6adMQxSpJS)
+
+## Quick Install
+
+```bash
+$ yarn add @langchain/community
+```
+
+## 🤔 What is this?
+
+LangChain Community contains third-party integrations that implement the base interfaces defined in LangChain Core, making them ready-to-use in any LangChain application.
+
+![LangChain Stack](../../docs/core_docs/static/img/langchain_stack.png)
+
+## 📕 Releases & Versioning
+
+`@langchain/community` is currently on version `0.0.x`
+
+All changes will be accompanied by a patch version increase.
+
+## 💁 Contributing
+
+As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
+
+For detailed information on how to contribute, see [here](../../CONTRIBUTING.md).