The Letta API

The Letta platform provides multiple ways to interact with your stateful agents. Whether through the ADE’s visual interface or programmatically via our APIs, you’re always connecting to the same agents running in your Letta server.

APIs and SDKs

We provide a comprehensive REST API and native SDKs in Python and TypeScript. All three interfaces - the ADE, REST API, and SDKs - use the same underlying API to interact with your agents, making it seamless to develop visually in the ADE and then integrate those agents into your applications.

Python SDK

The Letta Python SDK can be downloaded with:

$
pip install letta-client

Once installed, you can instantiate the client in your Python code with:

1
from letta import Letta
2
3
# connect to a local server
4
client = Letta(base_url="http://localhost:8283")
5
6
# connect to Letta Cloud
7
client = Letta(token="LETTA_API_KEY")

TypeScript SDK

The Letta TypeScript (Node) SDK can be downloaded with:

$
npm install @letta-ai/letta-client

Once installed, you can instantiate the client in your TypeScript code with:

1
import { LettaClient } from '@letta-ai/letta-client'
2
3
const client = new LettaClient({
4
    token: "LETTA_API_KEY",
5
});