Everything Claude Code (ECC) is a plugin pack that installs pre-built rules, hooks, commands, subagents, and skills into your Claude Code setup. Think of it as a starter kit for your harness — you'll customize it later, but it gives you a massive head start.

Here's what ships with it:

28 agents     → Specialized subagents for planning, reviewing, testing, etc.
125 skills    → Reusable capability definitions
60 commands   → Slash commands for common workflows
Pre-built rules → Language-specific conventions
Hook templates  → Automation starting points

Instead of building everything from scratch, you install ECC and then tune it to your project.