Breadth Chart Analyst

# Breadth Chart Analyst

## Overview

This skill enables specialized analysis of two complementary market breadth charts that provide strategic (medium to long-term) and tactical (short-term) market perspectives. Analyze breadth chart images to assess market health, identify trading signals based on backtested strategies, and develop positioning recommendations. All thinking and output are conducted exclusively in English.

## When to Use

Use this skill when:
- User provides S&P 500 Breadth Index (200-Day MA based) chart images for analysis
- User provides US Stock Market Uptrend Stock Ratio chart images for analysis
- User requests market breadth assessment or market health evaluation
- User asks about medium-term strategic positioning based on breadth indicators
- User needs short-term tactical timing signals for swing trading
- User wants combined strategic and tactical market outlook
- **User requests breadth analysis WITHOUT providing chart images** (CSV data mode)

Do NOT use this skill when:
- User asks about individual stock analysis (use `us-stock-analysis` skill instead)
- User needs sector rotation analysis without breadth charts (use `sector-analyst` skill instead)
- User wants news-based market analysis (use `market-news-analyst` skill instead)

## Prerequisites

- **Chart Images Optional**: CSV data from public sources is the PRIMARY data source; chart images provide supplementary visual context
- **No API Keys Required**: CSV data is fetched from public GitHub Pages; no external API subscriptions needed
- **Language**: All analysis and output conducted in English

## Output

This skill generates markdown analysis reports saved to the `reports/` directory:
- Chart 1 only: `breadth_200ma_analysis_[YYYY-MM-DD].md`
- Chart 2 only: `uptrend_ratio_analysis_[YYYY-MM-DD].md`
- Both charts: `breadth_combined_analysis_[YYYY-MM-DD].md`

Reports include executive summaries, current readings, signal identification, scenario analysis with probabilities, and actionable positioning recommendations for different trader types.

## Core Principles

1. **Dual-Timeframe Analysis**: Combine strategic (Chart 1: 200MA Breadth) and tactical (Chart 2: Uptrend Ratio) perspectives
2. **Backtested Strategy Focus**: Apply proven systematic strategies based on historical patterns
3. **Objective Signal Identification**: Focus on clearly defined thresholds, transitions, and markers
4. **English Communication**: Conduct all analysis and generate all reports in English
5. **Actionable Recommendations**: Provide specific positioning guidance for different investor types

## Chart Types and Purposes

### Chart 1: S&P 500 Breadth Index (200-Day MA Based)

**Purpose**: Medium to long-term strategic market positioning