Mql5 Indicator Patterns

If you're building custom indicators for MetaTrader 5, this covers the stuff that actually breaks in production. It's a collection of battle-tested patterns for OnCalculate functions, buffer management, and display scaling. The troubleshooting table alone is worth it: blank indicator windows (forgot to set scale for small values), drifting calculations (no new bar detection), misaligned plots (wrong warmup math). It's clearly written by someone who debugged these issues the hard way. The self-evolving approach means it gets updated when real problems surface, not just theoretical ones. Best used when you're past the basics and hitting the weird edge cases that MT5 documentation doesn't cover well.

skills.sh installs: 511
GitHub stars: 2
last updated: Aug 21, 2026

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Install

$ npx -y skills add terrylica/cc-skills --skill mql5-indicator-patterns --agent claude-code

Installs into .claude/skills of the current project.

Files

MQL5 Visual Indicator Patterns

Battle-tested patterns for creating custom MQL5 indicators with proper display, buffer management, and real-time updates.

Self-Evolving Skill: This skill improves through use. If instructions are wrong, parameters drifted, or a workaround was needed — fix this file immediately, don't defer. Only update for real, reproducible issues.

When to Use This Skill

Use this skill when:

Creating custom MQL5 indicators for MetaTrader 5
Debugging indicator display or buffer issues
Setting up OnCalculate with proper warmup handling
Implementing new bar detection patterns

Quick Reference

Essential Patterns

Display Scale (for small values < 1.0):

IndicatorSetDouble(INDICATOR_MINIMUM, 0.0);
IndicatorSetDouble(INDICATOR_MAXIMUM, 0.1);

Buffer Setup (visible + hidden):

SetIndexBuffer(0, BufVisible, INDICATOR_DATA);        // Visible
SetIndexBuffer(1, BufHidden, INDICATOR_CALCULATIONS); // Hidden

New Bar Detection (prevents drift):

static int last_processed_bar = -1;
bool is_new_bar = (i > last_processed_bar);

Warmup Calculation:

SKILL.md on GitHub

Details

Repository: github.com/terrylica/cc-skills
First seen: Jun 3, 2026

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