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Everything Claude Code (ECC) is a production-ready AI coding plugin providing a complete system of specialized agents, skills, commands, hooks, and rules for software development.

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Framework Architecture

ECC is built on five interconnected components that work together to create a powerful development environment:

Agents

Specialized subagents for delegated tasks with limited scope

Skills

Workflow definitions and domain knowledge libraries

Commands

Slash commands for quick execution of common workflows

Hooks

Event-driven automations that fire on tool executions

Rules

Always-follow guidelines for code quality and standards

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Core Principles

ECC is designed around five fundamental principles:

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1. Agent-First Development

Delegate domain-specific tasks to specialized agents rather than handling everything in the main conversation. This provides:
  • Focused expertise - Each agent is optimized for specific tasks
  • Better context management - Agents work with limited scope
  • Parallel execution - Independent agents can run simultaneously

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2. Test-Driven Development

All code must be developed test-first with comprehensive coverage:
  • Write tests before implementation (RED → GREEN → REFACTOR)
  • 80%+ coverage requirement across unit, integration, and E2E tests
  • Edge cases and error scenarios must be tested

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3. Security-First Approach

Security is never compromised:
  • No hardcoded secrets (API keys, passwords, tokens)
  • All user inputs validated at system boundaries
  • SQL injection and XSS prevention enforced
  • Authentication and authorization verified before commits

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4. Immutability

Always create new objects, never mutate existing ones: 
// ✅ Correct: Returns new object
const updated = { ...original, field: newValue }

// ❌ Wrong: Mutates in place
original.field = newValue

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5. Plan Before Execute

Complex features require planning before implementation:
  • Use the planner agent for architectural changes
  • Break down features into manageable phases
  • Identify dependencies and risks upfront
  • Enable incremental testing and delivery

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Project Structure

everything-claude-code/
├── agents/          # 13 specialized subagents
├── skills/          # 50+ workflow skills and domain knowledge
├── commands/        # 33 slash commands
├── hooks/           # Trigger-based automations
├── rules/           # Always-follow guidelines (common + per-language)
├── scripts/         # Cross-platform Node.js utilities
├── mcp-configs/     # 14 MCP server configurations
└── tests/           # Test suite

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How Components Work Together

1

User Request

You make a request: “Add user authentication with OAuth”
2

Command Execution

Execute /plan "Add user authentication with OAuth"
3

Agent Delegation

The planner agent analyzes requirements and creates an implementation plan
4

Skills Referenced

The agent references relevant skills like security-review and backend-patterns
5

Implementation with TDD

Use /tdd to implement the plan with test-driven development
6

Hooks Fire

PostToolUse hooks auto-format code and run type checks after edits
7

Rules Enforced

Security rules ensure no secrets are hardcoded before commit
8

Code Review

The code-reviewer agent reviews the implementation for quality issues

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Success Metrics

ECC measures success through five key metrics:
  • ✅ All tests pass with 80%+ coverage
  • ✅ No security vulnerabilities detected
  • ✅ Code is readable and maintainable
  • ✅ Performance meets requirements
  • ✅ User requirements are fully met

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Cross-Platform Support

ECC works across multiple AI coding tools:
PlatformAgentsCommandsSkillsHooksRules
Claude Code133350+8 events29
Cursor IDESharedSharedShared15 events29
Codex CLISharedInstruction-based16Not yetInstruction-based
OpenCode12243711 events13
All platforms share the same AGENTS.md file at the root, ensuring consistent behavior across tools.

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Next Steps

Understand Agents

Learn how specialized agents handle delegated tasks

Explore Skills

Discover workflow definitions and domain knowledge

Use Commands

Quick reference for slash commands

Configure Hooks

Set up event-driven automations