Letta MCP

An MCP server for managing a Letta (formerly MemGPT) server and communicating with its stateful agents. Lets an assistant list and create agents, send them messages, and inspect or edit their persistent memory blocks, which is useful for orchestrating long-lived agents that retain context across sessions.

{
  "mcpServers": {
    "letta": {
      "command": "npx",
      "args": [],
      "env": {
        "LETTA_BASE_URL": "<YOUR_LETTA_BASE_URL>",
        "LETTA_PASSWORD": "<YOUR_LETTA_PASSWORD>"
      }
    }
  }
}

{
  "type": "object",
  "properties": {}
}

{
  "type": "object",
  "required": [
    "agent_id",
    "message"
  ],
  "properties": {
    "message": {
      "type": "string",
      "description": "Message content"
    },
    "agent_id": {
      "type": "string",
      "description": "Target agent identifier"
    }
  }
}

{
  "type": "object",
  "required": [
    "agent_id",
    "label"
  ],
  "properties": {
    "label": {
      "type": "string",
      "description": "Memory block label (e.g. human, persona)"
    },
    "value": {
      "type": "string",
      "description": "New value for the memory block"
    },
    "agent_id": {
      "type": "string",
      "description": "Target agent identifier"
    }
  }
}