# MCP Server Building Sections in system.ts

1. Main section about creating MCP servers: Lines 1012-1015
   - Introduces the concept of creating MCP servers for new tools

2. OAuth and authentication handling: Lines 1017-1021
   - Details about non-interactive environment and handling credentials

3. Example weather server implementation: Lines 1025-1392
   - Complete example showing server creation, implementation, and configuration

4. Editing existing servers: Lines 1394-1399
   - Guidelines for modifying existing MCP servers

5. Usage note: Lines 1401-1405
   - Context about when to create vs use existing tools