Wires up Astral's ty, an extremely fast Python type checker, as an LSP server for Claude Code's built-in LSP tool. On .py / .pyi / .pyw files Claude can use hover (inferred types and docstrings), go-to-definition, go-to-implementation, find-references, document and workspace symbol search, and call hierarchy. Configuration is auto-detected from pyproject.toml; no extra LSP settings required. Requires ty on PATH (uv tool install ty or pip install ty).