Extending#

Building on Claude Code – subagents, skills, hooks, MCP servers, integration patterns, multi-agent teams, and dynamic workflows.

  • Extension Mechanisms – Architecture deep dive into subagents for task delegation, skills for knowledge and workflow injection, and MCP servers for external tool access.
  • Custom Extensions – Building custom subagents, skills, and plugins. File structures, YAML configuration, tool permissions, model selection, and the lens+reviewer pattern.
  • Hooks Cookbook – Copy-paste recipes for hook-based automation: auto-formatting, command safety, test gates, notifications, logging, and context injection.
  • Integration Patterns – Connecting Claude Code with external tools via MCP servers, hooks, headless mode, and GitHub Actions.
  • Agent Teams – Multi-agent orchestration where multiple Claude Code instances coordinate through direct messaging, shared task lists, and team lead delegation.
  • Dynamic Workflows – Orchestrating subagents at scale with a script Claude writes and the runtime runs in the background. The ultracode trigger, the /workflows view, saving workflows, and when to use them instead of subagents or agent teams.
Backward Background Agents Extension Architecture Forward