Case 02880

Setup

Install Homebrew (macOS)

If Homebrew is not installed:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Install dependencies

brew install jq curl git

This skill uses standard macOS package management. All packages are from the official Homebrew repository.

Stock Analyzer

Overview

Comprehensive stock analysis and portfolio tracking tool for Japanese and US markets. Integrates with Yahoo Finance for real-time data collection, technical indicator calculation, and news summarization.

Quick Start

# Fetch stock data (Japan)
python3 scripts/fetch_yahoo.py --symbol 7203.T --market japan

# Fetch stock data (US)
python3 scripts/fetch_yahoo.py --symbol AAPL --market us

# Analyze portfolio
python3 scripts/analyze.py --portfolio data/portfolio.json

# Calculate technical indicators
python3 scripts/analyze.py --symbol 7203.T --indicators macd,rsi,bollinger

Core Capabilities

1. Data Collection

Japanese Stocks (Yahoo! Finance Japan)

• Fetch real-time prices for TOPIX listed stocks (symbol format: XXXX.T)
• Retrieve historical data (daily/weekly/monthly)
• Get company fundamentals and financial statements

US Stocks (Yahoo Finance)

• Fetch NYSE/NASDAQ listed stocks
• Retrieve pre-market and after-hours data
• Get SEC filings and analyst ratings

Usage:

# Real-time price
python3 scripts/fetch_yahoo.py --symbol 7203.T --realtime

# Historical data
python3 scripts/fetch_yahoo.py --symbol AAPL --period 1y --interval 1d

# Company fundamentals
python3 scripts/fetch_yahoo.py --symbol MSFT --fundamentals

2. Portfolio Tracking

Track investment portfolio performance across multiple holdings.

Features:

• Daily profit/loss calculation
• Sector allocation analysis
• Dividend tracking
• Performance comparison vs benchmark indices

Portfolio format (JSON):

{
  "holdings": [
    {
      "symbol": "7203.T",
      "shares": 100,
      "avg_cost": 2500,
      "currency": "JPY"
    },
    {
      "symbol": "AAPL",
      "shares": 50,
      "avg_cost": 150,
      "currency": "USD"
    }
  ]
}

Usage:

# Analyze portfolio
python3 scripts/analyze.py --portfolio data/portfolio.json

# Export performance report
python3 scripts/analyze.py --portfolio data/portfolio.json --report performance.md

3. News & Earnings Summarization

Automatically summarize relevant financial news and earnings reports.

Features:

• Japanese: NIKKEI, Bloomberg Japan, company press releases
• US: Bloomberg, Reuters, MarketWatch
• Earnings call transcript analysis
• Key sentiment extraction

Usage:

# Get recent news for a stock
python3 scripts/fetch_yahoo.py --symbol 7203.T --news

# Summarize earnings report
python3 scripts/fetch_yahoo.py --symbol AAPL --earnings --quarter 2024Q4

# Sentiment analysis
python3 scripts/analyze.py --symbol 7203.T --sentiment --days 7

4. Technical Analysis

Calculate common technical indicators for trading decisions.

Supported indicators: See references/indicators.md

Usage:

# Single indicator
python3 scripts/analyze.py --symbol 7203.T --indicator macd

# Multiple indicators
python3 scripts/analyze.py --symbol AAPL --indicators macd,rsi,bollinger,ema

# Generate trading signals
python3 scripts/analyze.py --symbol 7203.T --signals --threshold 70

Resources

scripts/

fetch_yahoo.py

• Fetch stock data from Yahoo Finance
• Supports real-time, historical, and fundamentals
• Arguments: --symbol, --market (japan|us), --period, --interval, --news, --earnings

analyze.py

• Portfolio analysis and technical indicators
• Calculates profit/loss, allocation, indicators
• Arguments: --portfolio, --symbol, --indicators, --sentiment, --signals

references/

indicators.md - Technical indicator definitions and calculation methods

• MA, EMA, Bollinger Bands
• MACD, RSI, Stochastic Oscillator
• Trading signals interpretation

data_sources.md - Available data sources and their coverage

• Japan: TOPIX, Mothers, JASDAQ
• US: NYSE, NASDAQ, AMEX

Notes

• Japanese stocks use .T suffix (e.g., 7203.T for Toyota)
• US stocks use plain symbol (e.g., AAPL)
• Currency conversion uses JPY/USD rate from Yahoo Finance
• Historical data available from 1970 onwards for US stocks