Strict interfaces and dep management for Python, written in Rust
Tach is a pip package that lets you define module boundaries, automatically detect all cross-module dependencies, and then validate and enforce those dependencies. It also supports strict interfaces for modules by overloading `__all__`. The core static analysis is done in Rust, so all Tach commands run quickly. The goal of Tach is to help eng teams maintain velocity while scaling quickly, something we've seen break down a number of times. Give it a try!
Strict interfaces and dep management for Python, written in Rust launched on August 26, 2024 with 68 votes, #727 of 5,471 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Tach is a Python package that helps teams define and enforce module boundaries within codebases. It automatically detects cross-module dependencies and validates them against defined rules, while supporting strict interfaces through `__all__` overloading. Built with Rust for fast performance, Tach enables engineering teams to maintain code organization and development velocity as projects scale.
written from the facts on this page · September 2026
From the sources
A Python tool to visualize + enforce dependencies, using modular architecture 🌎 Open source 🐍 Installable via pip 🔧 Able to be adopted incrementally - ⚡ Implemented with no runtime impact ♾️ Interoperable with your existing systems 🦀 Written in rust - tach-org/tach
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