Claude Code Facts

A collection of interesting and useful facts, tips, and tools for working with Claude and Claude Code — including plugins, MCP servers, and practical usage patterns.

MCP Servers

MCP (Model Context Protocol) servers are external processes that provide tools to Claude Code via a standardized protocol. They run alongside your session and extend Claude's capabilities.

Context7

Up-to-date documentation and code examples for any library, available directly in your Claude Code session.

• Website: https://context7.com/

• Setup:

  claude mcp add --scope user --transport http context7 https://mcp.context7.com/mcp --header "CONTEXT7_API_KEY: <YOUR_API_KEY>"
  

• Note: API key can be created for free after signing in at context7.com

Skills (Slash Commands)

Skills are a different extension mechanism from MCPs. They are prompt-based extensions invoked via /skill-name commands directly within Claude Code — no external server required.

AST Index

Fast code search skill for Claude Code — find classes, symbols, usages, implementations, and more across large codebases using AST parsing.

• Repository: https://github.com/defendend/Claude-ast-index-search
• Usage: Invoke with /ast-index or related commands like "find class", "search for symbol", etc.

Guides

Everything Claude Code (ECC) — Setup Guide

Step-by-step instructions for setting up Everything Claude Code on a new machine — a comprehensive collection of skills, rules, agents, and hooks for Claude Code.