Overview

The Letta MCP Server provides a bridge between AI models and the Letta agent management system. It allows language models to create, manage, and interact with Letta agents, their memories, and associated tools in a standardized way.

Created by:

Developed by Oculair Media

Key Features

🤖

Agent Management

Create, modify, clone, and manage Letta agents

🧠

Memory Operations

Handle memory blocks and passages for agents

🔧

Tool Integration

Attach and manage tools for agents with full MCP support

📊

Enhanced Metadata

Output schemas and behavioral annotations for all tools

Available Tools

The Letta MCP server offers consolidated tools that use a discriminator pattern. You specify the desired operation within the tool arguments.

Quick Reference

Tool	Purpose	Category
`agent`	Manage Letta agents	Agent Management
`memory`	Handle memory blocks	Memory
`tool`	Manage agent tools	Tool Management

Detailed Usage

agent▶

Perform operations on Letta agents, such as creating, listing, or messaging.

// Create a new agent
use_mcp_tool({
  server_name: "letta",
  tool_name: "agent",
  arguments: {
    operation: "create_agent",
    name: "My New Agent",
    model: "openai/gpt-4"
  }
});

// Send a message to an agent
use_mcp_tool({
  server_name: "letta",
  tool_name: "agent",
  arguments: {
    operation: "message_agent",
    agent_id: "agent-123",
    message: "Hello, agent!"
  }
});

memory▶

Manage memory blocks for agents.

// Create a memory block
use_mcp_tool({
  server_name: "letta",
  tool_name: "memory",
  arguments: {
    operation: "create_memory_block",
    name: "agent_persona",
    label: "persona",
    value: "You are a helpful assistant."
  }
});

tool▶

Manage tools for agents.

// List available tools
use_mcp_tool({
  server_name: "letta",
  tool_name: "tool",
  arguments: {
    operation: "list_tools"
  }
});

Installation

{
  "mcpServers": {
    "letta": {
      "command": "npx",
      "args": [
        "-y",
        "letta-mcp-server"
      ],
      "env": {
        "LETTA_BASE_URL": "https://your-letta-instance.com/v1",
        "LETTA_PASSWORD": "your-secure-password"
      }
    }
  }
}

Sources

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Unity MCP Server

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Letta MCP Server