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Update Cloud index page. (#786)

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# LangGraph Cloud (alpha)
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LangGraph Cloud documentation is under construction. Contents may change until general availability.
LangGraph Cloud is a managed service for deploying and hosting LangGraph applications. Deploying your application with LangGraph Cloud shortens the time-to-market for developers. With one click, start a production-ready HTTP microservice with built-in persistence for your LangGraph application.
## Overview
LangGraph Cloud is a managed service for deploying and hosting LangGraph applications. Deploying applications with LangGraph Cloud shortens the time-to-market for developers. With one click, deploy a production-ready API with built-in persistence for your LangGraph application. LangGraph Cloud APIs are horizatonally scalable and deployed with durable storage.
The LangGraph Cloud API exposes functionality of your LangGraph application through [Assistants](./concepts/index.md#assistants). An assistant abstracts the cognitive architecture of your graph. Invoke an assistant by calling the pre-built [API endpoints](./reference/api_ref.md).
LangGraph Cloud is seamlessly integrated with [LangSmith](https://www.langchain.com/langsmith) and is accessible from within the LangSmith UI.
## Key Features
The LangGraph Cloud API supports key LangGraph features in addition to new functionality for enabling complex, agentic workflows.
- **Assistants and Threads**: Assistants abstract the cognitive architecture of graphs and threads track the state/history of graphs.
- **Streaming**: API support for [LangGraph streaming modes](../concepts/low_level.md#streaming) including setting multiple streaming modes at the same time.
- **Human-in-the-Loop**: API support for [LangGraph human-in-the-loop features](../concepts/agentic_concepts.md#human-in-the-loop).
- **Double Texting**: Configure how assistants respond when new input is received while processing a previous input. Interrupt, rollback, reject, or enqueue.
- **Background Runs/Cron Jobs**: A built-in task queue enables background runs and scheduled cron jobs.
- **Stateless Runs**: For simpler use cases, invoke an assistant without needing to create a thread.
## Documentation
- [Tutorials](./quick_start.md): Learn to build and deploy applications for LangGraph Cloud.
- [How-to Guides](./how-tos/cloud_examples/stream_values/): Implement specific features of the LangGraph Cloud API such as streaming tokens, configuring double texting, and creating cron jobs. Go here if you want to copy and run a specific code snippet.
- [Conceptual Guides](./concepts/): In-depth explanations of the core data models (e.g. assistants) and key features (e.g. double texting) of the LangGraph Cloud API.
- [Reference](./reference/api_ref.md): References for the LangGraph Cloud API, the corresponding Python and JS/TS SDKs, and the LangGraph CLI.