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Tach lets you visualize and enforce dependencies in your codebase. 🌎 Open source 🐍 Installable via pip 🔧 Able to be adopted incrementally ⚡ Implemented with no runtime impact ♾️ Interoperable with your existing systems 🦀 Written in rust
Tach lets developers define module boundaries and automatically enforce dependency rules via CLI checks. It prevents imports from undeclared dependencies, detects circular dependencies, and validates that cross-module calls use public interfaces—enabling teams to maintain clean modular architecture without runtime overhead.
Tach supports incremental adoption with no runtime impact, allowing teams to mark module boundaries gradually, deprecate individual dependencies, and integrate with CI/CD and pre-commit hooks. This enables legacy projects to transition to modular design without requiring a complete rewrite.
Tach generates interactive dependency graphs via `tach show --web` or local GraphViz DOT format output. Developers can see module relationships, identify coupling patterns, and use `tach report` to inspect specific dependencies and usages, making architecture comprehension and refactoring decisions data-driven.
Tach's `tach check` command exits with non-zero status on violations, making it easy to integrate into GitHub Actions, pre-commit hooks, and CI systems. It also supports VS Code integration and inline ignore comments, allowing teams to enforce boundaries automatically during code review and deployment.