# Ataraxy-Labs/sem

Semantic version control => entity-level diffs, blame, and impact analysis on top of git. 28 languages via tree-sitter. Built for coding agents.

Repository: https://github.com/Ataraxy-Labs/sem
Canonical: https://ross.abutalabs.com/products/sem
Homepage: https://ataraxy-labs.github.io/sem/
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: ai-agents, developer-tools, git, semantic-diff, tree-sitter, code-intelligence, coding-agents, llm-tools, typescript, version-control
Last push: 2026-08-26T15:54:43+00:00

## Health v2 (maintenance only)
Score: 82/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 99, longevity 14
- inputs: {"age_days": 209, "days_push": 7, "days_rel": 11, "gap_med": 1.0, "n_releases_24m": 59}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3315, forks 101 (observed 2026-08-28T04:07:56.105727+00:00)

## What it is
sem is a semantic version control CLI built on top of Git that parses code with tree-sitter and diffs, blames, and analyzes impact at the entity level (functions, classes, methods) instead of lines. It supports ~30 languages, works in any Git repo with no setup, and exposes an MCP interface designed for coding agents.

## Use cases
- show which functions changed in a commit instead of line diffs
- find who last changed a specific function with semantic blame
- analyze what code depends on a function before refactoring
- give coding agents more accurate diff context via MCP
- review pull requests at the entity level across many languages

## When to choose
- you want entity-level diffs, blame, or impact analysis on top of an existing Git repo
- you are building or using AI coding agents that need structured change summaries
- you work across many languages and want one zero-config tool

## When to avoid
- you need a full replacement for Git rather than a lens on top of it
- your code is in a language tree-sitter does not cover
- you only need plain line diffs and standard git tooling suffices

## Facets
- artifact type: cli-tool
- maturity: active
- function: version-control, parser, developer-tools, code-review, cli
- domain: developer-tools, version-control, parsers
- platform: cli, windows, cross-platform
- tags: semantic-diff, tree-sitter, git, entity-level-diffs, coding-agents, mcp, code-intelligence, blame, impact-analysis, command-line, ai-agents, macos, linux

## Member repositories
- Ataraxy-Labs/sem (main) score 82

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:56.105727+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:42:05.265569+00:00, confidence not recorded.
  - readme: https://github.com/Ataraxy-Labs/sem (fetched 2026-08-28T04:07:56.105727+00:00, sha 70d3ff5f962d)
  - homepage: https://ataraxy-labs.github.io/sem/ (fetched 2026-08-29T09:34:58.965755+00:00, sha 1bddcfd107ec)
- Data as of 2026-08-30T08:39:29.467469+00:00.