Ataraxy-Labs Introduces Sem: Semantic Version Control for Coding Agents

Ataraxy-Labs has launched `sem`, an open-source semantic version control system built on top of Git. Unlike standard Git, which tracks changes at the line level, `sem` parses code using tree-sitter to identify and track modifications to specific code entities such as functions, classes, and methods. This allows developers and coding agents to see 'function `blahh` was modified' instead of 'lines x-y changed'.

The tool supports 26 programming languages and offers features like entity-level diffs with rename detection, structural hashing, and word-level inline highlights. It also includes `sem impact` for cross-file dependency analysis, `sem blame` for entity-level authorship, and `sem log` to track entity evolution. A notable feature is `sem context`, which provides token-budgeted context for LLMs, including an entity, its dependencies, and dependents, optimized for strict content token budgets.

`sem` is designed to integrate seamlessly into existing Git workflows, allowing users to replace `git diff` output with entity-level diffs without changing commands. It also installs a pre-commit hook to show the entity-level blast radius of staged changes. The project is written in Rust and is available on GitHub under an Apache 2.0 license, with its latest release being v0.7.0.