# mql-developer
[Claude Code](https://docs.anthropic.com/en/docs/claude-code) skill for professional MQL4/MQL5 development on MetaTrader 4 and MetaTrader 5 platforms.
Covers the full ecosystem: Expert Advisors, custom indicators, scripts, libraries, UI panels, trading operations, external API communication, backtesting, and code protection.
## What It Provides
- **MQL4 & MQL5 language reference** — data types, functions, predefined variables, preprocessor, error handling
- **OOP & Standard Library (MQL5)** — classes, interfaces, templates, CTrade, CPositionInfo, CCanvas
- **EA architecture patterns** — single-file, modular (Signal + Trade + Risk + Filter), state machine, multi-timeframe, multi-symbol
- **Trading operations** — order/position management with retry logic, risk-based position sizing, drawdown control, trailing stops
- **Indicators & UI** — custom indicators (buffers, draw styles, OnCalculate), graphical objects, CAppDialog panels, scripts
- **External communication** — WebRequest REST API, JSON handling, Node.js server integration, sockets, inter-program communication
- **Backtesting** — Strategy Tester modes, walk-forward analysis, Monte Carlo simulation, optimization
- **Security & licensing** — account-based licensing, server-side validation, anti-decompilation, MQL5 Cloud Protector
## Skill Structure
```
mql-developer/
├── SKILL.md # Entry point with navigation table
└── references/
├── mql4-reference.md # MQL4 language reference
├── mql5-reference.md # MQL5 OOP, CTrade, Standard Library
├── architecture-patterns.md # EA architectures and design patterns
├── trading-operations.md # Orders, risk management, trailing stops
├── indicators-and-ui.md # Indicators, panels, scripts, chart objects
├── external-communication.md # WebRequest, JSON, Node.js, sockets
├── backtesting.md # Strategy Tester, optimization, Monte Carlo
└── security-licensing.md # Code protection and licensing
```
Uses progressive disclosure: `SKILL.md` loads first (~140 lines), then only the relevant reference file is loaded based on the task.
## Installation
Copy the skill to your Claude Code skills directory:
```bash
# Option 1: Clone and copy
git clone https://github.com/YOUR_USERNAME/mql-developer.git
cp -r mql-developer ~/.claude/skills/
# Option 2: Direct copy (if already cloned)
cp -r mql-developer ~/.claude/skills/
```
The skill activates automatically when Claude detects MQL-related tasks.
## Usage Examples
```
You: "Create an EA with MA crossover strategy for EURUSD"
You: "Add risk management with 2% per trade and max 10% daily drawdown"
You: "Build a custom RSI indicator with color zones"
You: "Set up WebRequest to send trade notifications to my Node.js server"
You: "Add account-based licensing to my EA"
```
## Design Principles
Built following the [skill-creator](https://github.com/anthropics/courses/tree/master/claude-code/09-skills) best practices:
- **SKILL.md under 500 lines** — concise entry point with navigation
- **Progressive disclosure** — reference files loaded only when needed
- **No duplication** — language references contain API signatures, specialized files contain production patterns
- **Table of contents** — all reference files include TOC for quick navigation
- **Grep patterns** — SKILL.md includes section headers for targeted search in large files
## License
MIT