letta-ai/letta-code

Overview

This skill connects to Model Context Protocol (MCP) servers and converts them into reusable skills. It provides simple command-line scripts to probe MCP servers over HTTP or stdio, inspect available tools, and create a dedicated skill wrapper when a server will be used repeatedly.

How this skill works

The skill offers two transport helpers: an HTTP client that sends JSON-RPC requests to a server URL, and a stdio client that runs a subprocess and communicates via stdin/stdout. Use the clients to list tools, fetch tool schemas, and call tools with JSON arguments. Once a server is understood, you can create a focused skill wrapper that embeds common defaults and invocation shortcuts.

When to use it

• You want to connect an external MCP server (HTTP or stdio) to the agent.
• You need to discover available tools and resource schemas exposed by an MCP server.
• You plan to use a particular MCP server frequently and want reusable wrappers.
• You need to test calls, troubleshoot auth, or validate input schemas before automation.
• You want a repeatable workflow for integrating third-party tool servers into the agent.

Best practices

• First determine transport: HTTP (URL) or stdio (command), then pick the matching helper.
• Always list tools and inspect a tool's schema before calling it — match JSON input to the schema.
• For HTTP servers, pass required auth headers; for stdio servers, set env vars and working directory.
• Create a lightweight wrapper skill with sensible defaults when reuse is expected to reduce friction.
• Run the subprocess command manually to verify it starts correctly before using the stdio helper.

Example use cases

• Connect to a local filesystem MCP server and call read_file to fetch project docs.
• Probe a hosted MCP endpoint with an Authorization header to list available search and vault tools.
• Wrap a frequently used GitHub MCP server in a dedicated skill that presets auth and repo settings.
• Run a Python-based MCP service as a subprocess and test tool schemas and sample calls.
• Create a convenience wrapper that exposes only the subset of MCP tools you use daily.