My weekly quota for the MAX plan melted in three days.

Even though I should have had a 20x quota, by Wednesday, the remaining amount was looking suspicious. I usually just brush that off as "well, that happens," but it suddenly made me curious. What is actually going on inside the context window?

In my previous article, I wrote about token saving for AI secretaries, such as trimming CLAUDE.md or shrinking MCP tool definitions. But this time, it’s not about AI secretaries, but Claude Code itself. It turns out the tool itself was the big eater.

The Trigger

On April 14th, a tweet in Spanish caught my eye.