Agent Development Environment (ADE)

The ADE is currently in open beta. During the beta period, you can access the ADE at https://app.letta.com and connect it to your local Letta server or self-hosted deployments.

What is the ADE?

The Agent Development Environment (ADE) is a visual interface for creating and managing stateful agents. Use the ADE to design, test, and monitor your agents while getting direct visibility into their memory state and decision-making process.

Unlike simple chatbot interfaces, the ADE gives you complete control over your agent’s state across its entire lifecycle:

  • Create and customize agents without writing code
  • Visualize your agent’s memory and context window in real-time
  • Add and test custom tools in a sandboxed environment
  • Monitor agent behavior and performance

The ADE provides a graphical interface to agents running in your Letta server. These same agents can be accessed via the Letta APIs, allowing you to integrate them into your applications.

Main ADE features

You can use the ADE to create, edit, and test agents running inside a Letta Server. The ADE provides you direct visibility into your agent’s state, including its context window, core memory blocks, attached tools, and archival memory (e.g. vector database).

👾 Agent Simulator

The agent simulator (center panel) provides a real-time view of your agent’s conversation and event history. Beyond just chatting, you can send system messages (e.g. for meta/event style messages) and observe how your agent processes information and makes decisions.

⚙️ Agent Configuration

Use the ADE to configure your agent’s settings (left panel):

  • Choose from different LLM models
  • Configure your agent’s system instructions
  • Connect tools and data sources to your agent

🧠 State Visualization

Monitor your agent’s state in real-time (right panel):

  • Context window viewer shows exactly what information your agent is currently processing
  • Core memory blocks display persistent agent knowledge
  • Archival memory connects your agent to external data sources

ADE guide

Learn more about the ADE in our ADE guide:

If you have additional questions, feedback, or feature requests, reach out on Discord!

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