market-breadth-analyzer

The saved excerpt is a snapshot from review. The external source remains the complete and most current version.

---
name: market-breadth-analyzer
description: Quantifies market breadth health using TraderMonty's public CSV data. Generates a 0-100 composite score across 6 components (100 = healthy). No API key required. Use when user asks about market breadth, participation rate, advance-decline health, whether the rally is broad-based, or general market health assessment.
---

# Market Breadth Analyzer Skill

## Purpose

Quantify market breadth health using a data-driven 6-component scoring system (0-100). Uses TraderMonty's publicly available CSV data to measure how broadly the market is participating in a rally or decline.

**Score direction:** 100 = Maximum health (broad participation), 0 = Critical weakness.

**No API key required** - uses freely available CSV data from GitHub Pages.

## When to Use This Skill

**English:**
- User asks "Is the market rally broad-based?" or "How healthy is market breadth?"
- User wants to assess market participation rate
- User asks about advance-decline indicators or breadth thrust
- User wants to know if the market is narrowing (fewer stocks participating)
- User asks about equity exposure levels based on breadth conditions

**Japanese:**
- 「マーケットブレッドスはどうですか？」「市場の参加率は？」
- 「上昇は広がっている？」「一部の銘柄だけの上昇？」
- ブレッドス指標に基づくエクスポージャー判断
- 市場の健康度をデータで確認したい

## Prerequisites

- **Python 3.9+** with `requests` library (for fetching CSV data)
- **Internet access** to reach GitHub Pages URLs
- **No API keys required** - uses freely available public CSV data

## Difference from Breadth Chart Analyst

| Aspect | Market Breadth Analyzer | Breadth Chart Analyst |
|--------|------------------------|----------------------|
| Data Source | CSV (automated) | Chart images (manual) |
| API Required | None | None |
| Output | Quantitative 0-100 score | Qualitative chart analysis |
| Components | 6 scored dimensions | Visual pattern recognition |
| Repeatability | Fully reproducible | Analyst-dependent |

---

## Execution Workflow

### Phase 1: Execute Python Script

Run the analysis script. If using a nested or date-stamped `--output-dir` in cron runs, create it first; the history writer expects the directory to already exist.

```bash
mkdir -p reports/<routine-or-date>
python3 skills/market-breadth-analyzer/scripts/market_breadth_analyzer.py \
  --detail-url "https://tradermonty.github.io/market-breadth-analysis/market_breadth_data.csv" \
  --summary-url "https://tradermonty.github.io/market-breadth-analysis/market_breadth_summary.csv" \
  --output-dir reports/<routine-or-date>
```

For a simple ad-hoc run, omit `--output-dir` or use an existing directory. In scheduled cron runs from the repository root, prefer a repo-relative output directory such as `reports/after-close-YYYY-MM-DD` rather than an absolute path. If an absolute nested `--output-dir` unexpectedly fails at the history-writing step despite the directory existing, rerun once with the equivalent repo-relative path before treating the breadth analysis as unavailable.

The script will:
1. Fetch detail CSV (~2,500 rows, 2016-present) and summary CSV (8 metrics)
2. Validate data freshness (warn if > 5 days old)
3. Calculate all 6 component scores (with automatic weight redistribution if any component lacks data)
4. Generate composite score with zone classification
5. Track score history and compute trend (improving/deteriorating/stable)
6. Output JSON and Markdown reports

### Phase 2: Present Results

Present the generated Markdown report to the user, highlighting:
- Composite score and health zone
- Strongest and weakest components
- Recommended equity exposure level
- Key breadth levels to watch
- Any data freshness warnings

---

## 6-Component Scoring System

| # | Component | Weight | Key Signal |
|---|-----------|--------|------------|
| 1 | Breadth Level & Trend | **25%** | Current 8MA level + 200MA trend direction + 8MA direction modifier |
| 2 | 8MA vs 200MA Crossover | **20%** | Momentum via MA gap and direction |
| 3 | Peak/Trough Cycle | **20%** | Position