Connecting Letta to MCP Servers

Connect Letta agents to tools over Model Context Protocol (MCP)

Letta no longer supports legacy .json configuration files. Use the ADE or API/SDK.

Letta supports three MCP transport types depending on your deployment and use case.

Connection Methods

  • ADE: Point-and-click server management via web interface
  • API/SDK: Programmatic integration for production

Transport Types

  • Streamable HTTP (Recommended): Production-ready with auth support. Works on Cloud + self-hosted.
  • SSE (Legacy): Deprecated but supported for compatibility.
  • stdio (Self-hosted only): Local development and testing.
TransportCloudSelf-hosted
Streamable HTTP
SSE
stdio

Tool Execution Flow

Quick Start

  1. Choose transport type based on your deployment
  2. Connect via ADE: Tool Manager → Add MCP Server
  3. Attach tools to agents

See remote servers or local servers for detailed setup.