01. WRITING
The Series
Field notes from a daily practice with AI coding agents. Patterns, tools, sharp edges. Evidence-based, no fluff.
Token spend per task complexity, when Opus actually pays back over Sonnet, and the cost-of-defect curve that makes "use the cheap model" the most expensive choice you can make
Cache reads cost a tenth what cache writes cost, and most agents leave that 90% discount on the table because nobody structures their system prompt for hits. Here's how to order your messages so the cache pays you back.