Building with Claude — sharing a practical financial skill that's run in production for 6 months.

Two free skills:

1. Options Flow Analyzer
Scans sector ETFs, filters lottery calls, computes adjusted put/call ratios vs historical baselines. Catches institutional positioning signals that raw P/C ratios miss.

Real example: XLI P/C = 5.32 while SPY = 0.44. That divergence = industrials being hedged, tech staying long. Macro rotation signal.

2. News Sentiment Engine
50+ RSS feeds → Claude scoring → structured Telegram briefing. Processes 80–150 articles/day, 0ドル.15/day in API costs. Running since November 2025.

Why it works:
Both skills use SKILL.md format — single-responsibility prompts with explicit output schemas. Consistent structure = reliable output = useful automation.

GitHub: https://github.com/tellmefrankie/ai-investment-skills