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ty is an extremely fast Python type checker. ty is an extremely fast Python type checker and a language server written in Rust. It can type check large Python codebases in seconds, providing fast feedback during development. ty includes both a CLI (ty check) and a language server (ty server) for editor integration. When fetching documentation, use explicit index.md paths for directories, e.g., https://docs.astral.sh/ty/features/index.md. This returns clean markdown instead of rendered HTML with JS/CSS.

The file

We split this llms.txt into the rules it gives an agent

1 rule. About 0 are common, 0 are distinctive, and 1 is very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈0

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 1

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    When fetching documentation, use explicit index.md paths for directories, e.g., https://docs.astral.sh/ty/features/index.md.

    line 11

≈ “Common” is an estimate: at least 1 in 5 of the 3,592 llms.txt files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
llms.txt
# ty

> ty is an extremely fast Python type checker.

ty is an extremely fast Python type checker and a language server written in Rust.
It can type check large Python codebases in seconds, providing fast feedback
during development.

ty includes both a CLI (`ty check`) and a language server (`ty server`) for editor integration.

When fetching documentation, use explicit `index.md` paths for directories, e.g.,
`https://docs.astral.sh/ty/features/index.md`. This returns clean markdown instead
of rendered HTML with JS/CSS.


## Guides

- [Coming from mypy, pyright](https://docs.astral.sh/ty/coming-from-mypy-or-pyright/index.md)
- [Editor integration](https://docs.astral.sh/ty/editors/index.md)
- [Installation](https://docs.astral.sh/ty/installation/index.md)
- [Type checking](https://docs.astral.sh/ty/type-checking/index.md)

## Concepts

- [Configuration](https://docs.astral.sh/ty/configuration/index.md)
- [File exclusions](https://docs.astral.sh/ty/exclusions/index.md)
- [Module discovery](https://docs.astral.sh/ty/modules/index.md)
- [Python version](https://docs.astral.sh/ty/python-version/index.md)
- [Rules](https://docs.astral.sh/ty/rules/index.md)
- [Suppression](https://docs.astral.sh/ty/suppression/index.md)

## Features

- [Diagnostics](https://docs.astral.sh/ty/features/diagnostics/index.md)
- [Language server](https://docs.astral.sh/ty/features/language-server/index.md)
- [Type system](https://docs.astral.sh/ty/features/type-system/index.md)
- [Third-party library support](https://docs.astral.sh/ty/features/third-party/index.md)
- [Django](https://docs.astral.sh/ty/features/third-party/django/index.md)
- [Pydantic](https://docs.astral.sh/ty/features/third-party/pydantic/index.md)
- [pytest](https://docs.astral.sh/ty/features/third-party/pytest/index.md)

## Reference

- [CLI](https://docs.astral.sh/ty/reference/cli/index.md)
- [Configuration](https://docs.astral.sh/ty/reference/configuration/index.md)
- [Editor settings](https://docs.astral.sh/ty/reference/editor-settings/index.md)
- [Environment variables](https://docs.astral.sh/ty/reference/environment/index.md)
- [Exit codes](https://docs.astral.sh/ty/reference/exit-codes/index.md)
- [Rules](https://docs.astral.sh/ty/reference/rules/index.md)
- [Typing FAQ](https://docs.astral.sh/ty/reference/typing-faq/index.md)

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