Letta MCP Builder

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

Originally published by letta. Licensed under Apache-2.0. View original: https://github.com/letta-ai/skills/tree/main/tools/mcp-builder

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Add the free skill.ski MCP server to your .mcp.json or equivalent config file:

{
  "mcpServers": {
    "skill-ski-free": {
      "url": "https://mcp.skill.ski/free",
      "type": "http"
    }
  }
}

Once connected, this Oski is available as a callable tool at your runtime. No paywall. No sign-in required for free-tier Oskis.