Letronna®

Guide

Your data

Letronna keeps its data in one folder on your computer:

  • Windows: %LOCALAPPDATA%\Letronna\
  • macOS: ~/Library/Application Support/Letronna/
  • Linux: ~/.local/share/Letronna/
FileHolds
chats.json and the sessionsyour conversations, and the gateway and model picked
keys.jsonAPI keys per gateway, in plain text on your disk only
account.jsonthe Letronna sign-in for this computer
SOUL.mdwho Letronna is, in your words (optional)
USER.md, MEMORY.mdwhat it knows about you, and its own notes; edit them any time
mcp.jsonMCP servers whose tools it may use (optional)
media/images, speech and video made with no project attached

With a project folder attached, its AGENTS.md is read as the project's instructions. Chat text goes to the gateway you picked and nowhere else; with the Letronna gateway, that is api.letronna.ai, which records each request's model and cost for your usage page.

Tools from MCP servers

List MCP servers that run as a local command in mcp.json, in the same shape Claude Desktop and Cursor use:

{
  "mcpServers": {
    "everything": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-everything"],
      "autoApprove": ["echo"]
    }
  }
}

Their tools appear once the servers answer. Every call asks first unless the tool is in autoApprove; "disabled": true leaves a server off.