# Dan's Notebook
> Technical notes on agents, systems, and software. Built in public by Dan Treasure.

## About
Dan Treasure is a content creator and technical consultant based in Michigan. He builds software tools and writes about agents, LLM cost optimization, and developer infrastructure.

## Posts
- [Prompt Caching Is Everything: Applying Claude Code's Lessons to a Multi-Agent Investigation Pipeline](https://dansnotebook.com/posts/prompt-caching-is-everything) — 2026-02-21 — Auditing a 7-agent Claude pipeline against prompt caching best practices. 85% → 98.7% cache hit rate, accurate cost tracking, and the system prompt split that made it possible.

## Projects
- [Claude Code Video Review](https://review.dansnotebook.com) — Presenter notes, demo plans, and production tracking for the StormWind Studios Claude Code series. 122 videos across 4 courses.
- [10kdiff](https://10kdiff.com) — Financial comparison tool for SEC filings. AI-surfaced earnings comparisons across quarters. (In progress)

## Contact
Site: https://dansnotebook.com