Sem

sem Plugin

Semantic version control built on Git. Entity-level diff, blame, graph, and impact analysis for code.

Commands

Diff

• sem diff run — Entity-level diff with rename detection
• sem diff run --format json — JSON output for CI/AI

Analysis

• sem impact analyze — Cross-file dependency graph
• sem blame run — Entity-level blame
• sem log show — Track entity through history

Context

• sem entities list — List all entities in a file
• sem context generate — Token-budgeted LLM context

Usage Examples

# Semantic diff of working changes
sem diff

# JSON output for AI agents
sem diff --format json

# Impact analysis - what breaks if this changes
sem impact authenticateUser

# Entity blame
sem blame src/auth.ts --json

# Track entity evolution
sem log validateToken -v

# LLM context within token budget
sem context authenticateUser --budget 4000

Installation

brew install sem-cli

Key Features

• Entity-level diff (functions, classes, methods) instead of lines
• 23 languages via tree-sitter
• Rename and move detection
• Cross-file dependency analysis
• Token-budgeted LLM context generation
• Can replace git diff with sem setup