ty
ty — Python Type Checker & Language Server
ty (v0.0.32, Apr 2026) is Astral's Rust-based Python type checker and language server. Beta status — 0.0.x versioning, breaking changes between versions, and no stable API yet. Astral reports 10-100x faster checks than mypy and Pyright on large projects.
Formerly "Red-Knot" — renamed May 2025, extracted from the ruff repo to astral-sh/ty.
When to Use ty
[tool.ty]section inpyproject.tomlorty.tomlexists- Type checking Python code in any project
- Setting up an LSP for Python in your editor
When to wait: Projects heavily dependent on mypy plugins (Pydantic, Django, SQLAlchemy). ty has no plugin system and no plans to add one — first-class framework support is the stated approach instead.
How to Invoke
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