# Documentation


Xo (pronounced *ex-oh*) is a small, statically typed language for backends and
web services, designed so AI agents can write, check, cross compile, and debug
programs with fast, structured feedback.

- [Why Xo? (FAQ)](faq/): what Xo is for, how it relates to Go, and what experimental means.
- [Getting started](getting-started/): build the toolchain and run a first program.
- [A tour of Xo](tour/): twelve short steps through the language.
- [Diagnostic codes](diagnostics/): every error code, with an example and a fix.
- [Core language specification](spec/core/): the source of truth for syntax and semantics.
- [Standard library](spec/std/): prelude methods and the `std` packages.

Every page is also available as Markdown for agents: add `index.md` to its URL,
or start from [/llms.txt](/llms.txt).