Everything Claude Code (ECC) — Agent Harness Performance System

Skill by ara.so — Daily 2026 Skills collection.

Everything Claude Code (ECC) is a production-ready performance optimization system for AI agent harnesses. It provides specialized subagents, reusable skills, custom slash commands, memory-persisting hooks, security scanning, and language-specific rules — all evolved from 10+ months of daily real-world use. Works across Claude Code, Cursor, Codex, OpenCode, and Antigravity.

---

Installation

Option 1: Plugin Marketplace (Recommended)

# Inside Claude Code, run:
/plugin marketplace add affaan-m/everything-claude-code
/plugin install everything-claude-code@everything-claude-code

Option 2: Manual Clone

git clone https://github.com/affaan-m/everything-claude-code.git
cd everything-claude-code

# Install rules for your language stack
./install.sh typescript
# Multiple languages:
./install.sh typescript python golang swift
# Target a specific IDE:
./install.sh --target cursor typescript

Install Rules (Always Required)

Claude Code plugins cannot auto-distribute rules — install them manually via ./install.sh or copy from rules/ into your project's .claude/rules/ directory.

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Directory Structure

everything-claude-code/
├── .claude-plugin/         # Plugin and marketplace manifests
│   ├── plugin.json
│   └── marketplace.json
├── agents/                 # Specialized subagents (planner, architect, etc.)
├── commands/               # Slash commands (/plan, /security-scan, etc.)
├── skills/                 # Reusable skill modules
├── hooks/                  # Lifecycle hooks (SessionStart, Stop, PostEdit, etc.)
├── rules/
│   ├── common/             # Language-agnostic rules
│   ├── typescript/
│   ├── python/
│   ├── golang/
│   └── swift/
├── scripts/                # Setup and utility scripts
└── install.sh              # Interactive installer

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Key Commands

After installation, use the namespaced form (plugin install) or short form (manual install):

# Planning & architecture
/everything-claude-code:plan "Add OAuth2 login flow"
/everything-claude-code:architect "Design a multi-tenant SaaS system"

# Research-first development
/everything-claude-code:research "Best approach for rate limiting in Node.js"

# Security
/everything-claude-code:security-scan
/everything-claude-code:harness-audit

# Agent loops and orchestration
/everything-claude-code:loop-start
/everything-claude-code:loop-status
/everything-claude-code:quality-gate
/everything-claude-code:model-route

# Multi-agent workflows
/everything-claude-code:multi-plan
/everything-claude-code:multi-execute
/everything-claude-code:multi-backend
/everything-claude-code:multi-frontend

# Session and memory
/everything-claude-code:sessions
/everything-claude-code:instinct-import

# PM2 orchestration
/everything-claude-code:pm2

# Package manager setup
/everything-claude-code:setup-pm

With manual install, drop the everything-claude-code: prefix: /plan, /sessions, etc.

---

Hook Runtime Controls

ECC hooks fire at agent lifecycle events. Control strictness at runtime without editing files:

# Set hook strictness profile
export ECC_HOOK_PROFILE=minimal    # Least intrusive
export ECC_HOOK_PROFILE=standard   # Default
export ECC_HOOK_PROFILE=strict     # Maximum enforcement

# Disable specific hooks by ID (comma-separated)
export ECC_DISABLED_HOOKS="pre:bash:tmux-reminder,post:edit:typecheck"

Hook events covered: SessionStart, Stop, PostEdit, PreBash, PostBash, and more.

---

Package Manager Detection

ECC auto-detects your package manager with this priority chain:

1. CLAUDE_PACKAGE_MANAGER environment variable
2. .claude/package-manager.json (project-level)
3. package.json → packageManager field
4. Lock file detection (package-lock.json, yarn.lock, pnpm-lock.yaml, bun.lockb)
5. ~/.claude/package-manager.json (global)
6. First available manager as fallback

# Set via environment
export CLAUDE_PACKAGE_MANAGER=pnpm

# Set globally
node scripts/setup-package-manager.js --global pnpm

# Set per-project
node scripts/setup-package-manager.js --project bun

# Detect current setting
node scripts/setup-package-manager.js --detect

---

Skills System

Skills are markdown modules the agent loads to gain domain expertise. Install individually or in bulk.

Using a Skill

# Reference a skill explicitly in your prompt
"Use the search-first skill to find the right caching approach before implementing"

# Or trigger via slash command
/everything-claude-code:research "content hashing strategies for API responses"

Notable Built-in Skills

Skill	Purpose
search-first	Research before coding — avoids hallucinated APIs
cost-aware-llm-pipeline	Optimizes token spend across model calls
content-hash-cache-pattern	Cache invalidation via content hashing
skill-stocktake	Audits which skills are loaded and active
frontend-slides	Zero-dependency HTML presentation builder
configure-ecc	Guided interactive ECC setup wizard
swift-actor-persistence	Swift concurrency + persistence patterns
regex-vs-llm-structured-text	Decides when to use regex vs LLM parsing

Writing a Custom Skill

Create skills/my-skill.md:

---
name: my-skill
description: What this skill does
triggers:
  - "phrase that activates this skill"
---

# My Skill

## When to Use
...

## Pattern
\`\`\`typescript
// concrete example
\`\`\`

## Rules
- Rule one
- Rule two

---

Instincts System (Continuous Learning)

Instincts are session-extracted patterns saved for reuse. They carry confidence scores and evolve over time.

Export an Instinct

/everything-claude-code:instinct-import

Instinct File Format

---
name: prefer-zod-for-validation
confidence: 0.92
extracted_from: session-2026-02-14
---

# Action
Always use Zod for runtime schema validation in TypeScript projects.

# Evidence
Caught 3 runtime type errors that TypeScript alone missed during session.

# Examples
\`\`\`typescript
import { z } from 'zod'

const UserSchema = z.object({
  id: z.string().uuid(),
  email: z.string().email(),
  role: z.enum(['admin', 'user'])
})

type User = z.infer<typeof UserSchema>
\`\`\`

---

Rules Architecture

Rules enforce coding standards per language. Install only what your stack needs.

# TypeScript + Python
./install.sh typescript python

# Check what's installed
ls .claude/rules/

Rule Directory Layout

rules/
├── common/         # Applies to all languages
│   ├── research-first.md
│   ├── security-baseline.md
│   └── verification-loops.md
├── typescript/
│   ├── no-any.md
│   ├── zod-validation.md
│   └── strict-mode.md
├── python/
│   ├── type-hints.md
│   └── django-patterns.md
└── golang/
    └── error-wrapping.md

---

Agents (Subagent Delegation)

Agents are specialized personas the orchestrator delegates to:

# In your prompt, reference an agent explicitly
"Delegate architecture decisions to the architect agent"
"Use the planner agent to break this feature into tasks"

Available agents include: planner, architect, researcher, verifier, security-auditor, and more. Each lives in agents/<name>.md with its own system prompt, tools list, and constraints.

---

AgentShield Security Scanning

Run security scans directly from Claude Code:

/everything-claude-code:security-scan

This invokes the AgentShield scanner (1282 tests, 102 rules) against your codebase and surfaces:

• Hardcoded secrets
• Injection vulnerabilities
• Insecure dependencies
• Agent prompt injection patterns

---

Memory Persistence Hooks

ECC hooks automatically save and restore session context:

// hooks/session-start.js — loads prior context on new session
const fs = require('fs')
const path = require('path')

const memoryPath = path.join(process.env.HOME, '.claude', 'session-memory.json')

if (fs.existsSync(memoryPath)) {
  const memory = JSON.parse(fs.readFileSync(memoryPath, 'utf8'))
  console.log('Restored session context:', memory.summary)
}

// hooks/stop.js — saves session summary on exit
const summary = {
  timestamp: new Date().toISOString(),
  summary: process.env.ECC_SESSION_SUMMARY 
how to use everything-claude-code-harness
CursorClaude CodeClineCodexWindsurfGooseGitHub CopilotVS CodeGemini CLIKiloOpencodeKimi CLIRoo ClineAiderContinueZedBolt.newLovablev0Replit AgentSweepSmol DeveloperDevinCavemanAmpAntigravity
How to use everything-claude-code-harness on Cursor
AI-first code editor with Composer
1
Prerequisites
Before installing skills in Cursor, ensure your development environment meets these requirements:
›Cursor installed and configured on your development machine
›Node.js version 16.0+ with npm package manager (verify with node --version)
›Active project directory or workspace where you want to add everything-claude-code-harness
2
Execute installation command
Execute the skills CLI command in your project's root directory to begin installation:
$npx skills add https://github.com/aradotso/trending-skills --skill everything-claude-code-harnesscopy
The skills CLI fetches everything-claude-code-harness from GitHub repository aradotso/trending-skills and configures it for Cursor.
3
Select Cursor when prompted
The CLI will show a list of available agents. Use arrow keys to navigate and space to select Cursor:
◆ Which agents do you want to install to?
│
│ ── Universal (.agents/skills) ── always included ────
│   • Amp
│   • Antigravity
│   • Cline
│   • Codex
│ ●Cursor(selected)
│   • Cursor
│   • Windsurf
4
Verify installation
Confirm successful installation by checking the skill directory location:
.cursor/skills/everything-claude-code-harness
Reload or restart Cursor to activate everything-claude-code-harness. Access the skill through slash commands (e.g., /everything-claude-code-harness) or your agent's skill management interface.
⚠
Security & Verification Notice
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your development environment. Always verify the publisher's identity, review recent commits, and test in isolated environments before production deployment.
Additional Resources
›View source code on GitHub›Skills CLI documentation›Learn more about Cursor›What are agent skills?