When you ask Claude Code about your project, it hunts: it opens a file, then another, then another, and every file it reads costs tokens. This free, open-source tool, past 12,000 GitHub stars, maps your whole project once into a searchable index. After that, Claude asks the map and gets back only the pieces of code that matter. Its makers measured about 40% fewer tokens for the same quality of results.
Here's what it does, how to set it up, and what it needs.
What it does for you
- Search by meaning: ask "find the code that handles user login" and Claude gets the right functions, even if they never use the word login.
- Fewer tokens: Claude stops opening file after file to find things, so your plan lasts longer.
- Big projects: built for codebases up to millions of lines.
- Stays fresh: after the first map, it only re-maps the files you changed.
- Many languages: TypeScript, JavaScript, Python, Java, C++, C#, Go, Rust, PHP, Ruby, Swift, Kotlin, Scala and Markdown.
Free, for your email
Get the full setup steps + the copy-paste setup prompt
The rest of this guide (3 more sections, 1 copy-paste prompt) opens right here. The setup prompt, one paste into Claude that sets it all up, comes by email only. Use your real address.
Unlocks: Setup (about 5 minutes) · The catch · Sources
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