# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Overview

This is a stock query skill for Taiwan stock market data. Python scripts in `scripts/` fetch data from Yahoo Finance Taiwan using a Browserless headless browser service, then output concise Chinese summaries.

## Environment Variables

All `*-browserless.py` scripts require these environment variables (loaded from `.env`):
- `BROWSERLESS_ENDPOINT` - Browserless service URL (e.g., `http://192.168.42.124:13000`)
- `BROWSERLESS_TOKEN` - Authentication token for Browserless

The `.env` file is searched first in current directory, then at workspace root (3 levels up from scripts).

## Architecture

Scripts fall into two categories:

### 1. Browserless Scripts (Dynamic Content Scraping)
Use Browserless to fetch Yahoo pages that require JavaScript rendering:

| Script | Purpose |
|--------|---------|
| `yahoo-quote-browserless.py` | Individual stock quote (price, OHLC, volume, bid/ask) |
| `yahoo-institutional-browserless.py` | Three major institutional investors (foreign, trust, dealer) |
| `yahoo-technical-browserless.py` | Technical indicators (RSI14, ATR14, KD, Bollinger Bands, 5-day K-line) |
| `yahoo-market-browserless.py` | TAIEX weighted index (^TWII) market summary |
| `yahoo-dividend-browserless.py` | Dividend history (cash/stock dividend, ex-date, yield) |
| `yahoo-broker-trading-browserless.py` | Top broker buy/sell rankings |

### 2. Direct API Scripts (No Browserless Required)
Use Yahoo Finance Chart API directly:

| Script | Purpose |
|--------|---------|
| `yahoo-etf-holdings.py` | ETF holdings (top 10, industry distribution, asset allocation) |
| `yahoo-ma-signal.py` | Moving averages (MA5/10/20/60) and 20-day bias |
| `yahoo-macd-signal.py` | MACD indicator (DIF, DEA, histogram) |

### 3. TWSE Public API Scripts (No Browserless Required)
Use TWSE open data API directly:

| Script | Purpose |
|--------|---------|
| `twse-margin-trading.py` | Margin trading balance (融資融券餘額) |
| `twse-day-trading.py` | Day trading statistics (當沖交易統計) |
| `twse-foreign-holdings.py` | Foreign investor holdings ratio (外資持股比例) |

## Common Commands

### Query individual stock (full analysis)
```bash
# Three scripts are typically run together for complete picture
python3 skills/stocks-query/scripts/yahoo-institutional-browserless.py 2330
python3 skills/stocks-query/scripts/yahoo-quote-browserless.py 2330
python3 skills/stocks-query/scripts/yahoo-technical-browserless.py 2330
```

### Query ETF (with holdings)
```bash
python3 skills/stocks-query/scripts/yahoo-quote-browserless.py 0050
python3 skills/stocks-query/scripts/yahoo-etf-holdings.py 0050
```

### Query market index
```bash
python3 skills/stocks-query/scripts/yahoo-market-browserless.py
```

### MA/MACD signals (direct API, no Browserless)
```bash
python3 skills/stocks-query/scripts/yahoo-ma-signal.py 2330
python3 skills/stocks-query/scripts/yahoo-macd-signal.py 2330
```

### Dividend / Broker trading (Browserless)
```bash
python3 skills/stocks-query/scripts/yahoo-dividend-browserless.py 2330
python3 skills/stocks-query/scripts/yahoo-broker-trading-browserless.py 2330
```

### TWSE data (margin, day-trading, foreign holdings)
```bash
python3 skills/stocks-query/scripts/twse-margin-trading.py 2330
python3 skills/stocks-query/scripts/twse-day-trading.py 2330
python3 skills/stocks-query/scripts/twse-foreign-holdings.py 2330
```

## Script Patterns

- All scripts accept stock symbol as first command-line argument (default provided)
- Browserless scripts use `urllib` or `subprocess` with `curl` to POST to Browserless `/content` endpoint
- HTML parsing uses regex patterns (not BeautifulSoup) to minimize dependencies
- Output format is Chinese text summaries with bullet points
- Error handling exits with code 1 and prints error message to stderr

## Stock Number Format

- Taiwan stocks: 4-digit number (e.g., `2330`, `3481`)
- ETFs: Typically start with `00` (e.g., `0050`, `00922`)
- Yahoo suffix: `.TW` is appended automatically in URLs

## Skill Integration

This directory is registered as a skill (see `SKILL.md`). When users input a stock number or ask about "大盤" (market), the scripts should be executed in sequence and results synthesized into a concise Chinese summary with plain-language interpretation of technical indicators.