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A tweet points out that most Claude Code token costs come from re-reading the entire codebase on each edit, and highlights a new category of tools that use codebase mapping, context pruning, and project memory to drastically cut token usage, with a list of 10 tools in the linked article.
Carto is an open-source tool that builds a persistent domain map of a codebase, helping AI agents understand systems and avoid failures like wrong file editing and context overflow, running entirely locally with no data leaks.