I built Arbor because I kept running into the same problem: making a refactor and only discovering later that it broke something far away in the codebase.

Arbor analyzes a repository and builds a graph of functions, classes, and dependencies so you can preview the blast radius of a change before touching the code.

Example workflow:

    git add .
    arbor diff

This looks at modified symbols and shows impacted callers and dependencies.

Recent releases added:

• git-aware change analysis (`arbor diff`) • CI safety checks (`arbor check`) • incremental indexing • persistent graph snapshots • a small GUI for exploring impact

The goal is to make refactoring safer, especially when working in large codebases or when using AI coding tools.

Repo: https://github.com/Anandb71/arbor

Would love feedback from people working on large or long-lived codebases.