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)

bash

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

Option 2: Manual Clone

bash

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.

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

Key Commands

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

bash

# 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:

bash

# 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:

```
CLAUDE_PACKAGE_MANAGER
```
environment variable
```
.claude/package-manager.json
```
(project-level)
```
package.json
```
→
```
packageManager
```
field

Lock file detection (

package-lock.json

yarn.lock

pnpm-lock.yaml

bun.lockb

)

```
~/.claude/package-manager.json
```
(global)
First available manager as fallback

bash

# 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

bash

# 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

markdown

---
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

bash

/everything-claude-code:instinct-import

Instinct File Format

markdown

---
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.

bash

# 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:

bash

# 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:

bash

/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:

javascript

// 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)
}

javascript

// hooks/stop.js — saves session summary on exit
const summary = {
  timestamp: new Date().toISOString(),
  summary: process.env.ECC_SESSION_SUMMARY || '',
  skills_used: (process.env.ECC_SKILLS_USED || '').split(',')
}

fs.writeFileSync(memoryPath, JSON.stringify(summary, null, 2))

Cross-Platform Support

Platform	Support
Claude Code	Full (agents, commands, skills, hooks, rules)
Cursor	Full (via `--target cursor` installer flag)
OpenCode	Full (plugin system, 20+ hook event types, 3 native tools)
Codex CLI	Full ( `codex.md` generated via `/codex-setup` )
Codex App	Full ( `AGENTS.md` -based)
Antigravity	Full (via `--target antigravity` installer flag)

Common Patterns

Research-First Development

"Before implementing the payment webhook handler, use the search-first skill to 
verify current Stripe webhook verification best practices."

Token Optimization

bash

# Route to cheaper model for simple tasks
/everything-claude-code:model-route "Write a unit test for this pure function"

# Use background processes for long analysis
/everything-claude-code:harness-audit

Parallelization with Git Worktrees

bash

# Create isolated worktrees for parallel agent tasks
git worktree add ../feature-auth -b feature/auth
git worktree add ../feature-payments -b feature/payments

# Each Claude Code session operates in its own worktree
# Merge when both complete

Verification Loop

bash

/everything-claude-code:loop-start    # Begin tracked loop
# ... agent does work ...
/everything-claude-code:loop-status   # Check progress
/everything-claude-code:quality-gate  # Enforce pass criteria before merge

Troubleshooting

Plugin commands not found after install

bash

/plugin list everything-claude-code@everything-claude-code
# If empty, re-run: /plugin install everything-claude-code@everything-claude-code

Rules not applied

bash

# Rules require manual install — plugin system cannot distribute them
cd everything-claude-code && ./install.sh typescript
# Verify:
ls ~/.claude/rules/   # or .claude/rules/ in project root

Hooks not firing

bash

# Check profile setting
echo $ECC_HOOK_PROFILE
# Check disabled list
echo $ECC_DISABLED_HOOKS
# Reset to defaults
unset ECC_HOOK_PROFILE
unset ECC_DISABLED_HOOKS

Instinct import drops content Ensure you're on v1.4.1+. Earlier versions had a bug where

parse_instinct_file()

silently dropped Action/Evidence/Examples sections. Pull latest and re-run.

Wrong package manager used

bash

node scripts/setup-package-manager.js --detect
export CLAUDE_PACKAGE_MANAGER=pnpm   # Override explicitly

Resources

Homepage: https://ecc.tools
GitHub: https://github.com/affaan-m/everything-claude-code
GitHub App (Marketplace): https://github.com/marketplace/ecc-tools
npm (universal):
```
ecc-universal
```
npm (security):
```
ecc-agentshield
```
Shorthand Guide: https://x.com/affaanmustafa/status/2012378465664745795
Longform Guide: https://x.com/affaanmustafa/status/2014040193557471352

everything-claude-code-harness

NPX Install

Tags

SKILL.md Content

Everything Claude Code (ECC) — Agent Harness Performance System

Installation

Option 1: Plugin Marketplace (Recommended)

Option 2: Manual Clone

Install Rules (Always Required)

Directory Structure

Key Commands

Hook Runtime Controls

Package Manager Detection

Skills System

Using a Skill

Notable Built-in Skills

Writing a Custom Skill

Instincts System (Continuous Learning)

Export an Instinct

Instinct File Format

Rules Architecture

Rule Directory Layout

Agents (Subagent Delegation)

AgentShield Security Scanning

Memory Persistence Hooks

Cross-Platform Support

Common Patterns

Research-First Development

Token Optimization

Parallelization with Git Worktrees

Verification Loop

Troubleshooting

Resources