Impact Lens

Know exactly what your changes break — before they do.

Impact Lens scans your entire codebase at symbol level, reads your git diff, and traces the blast radius of every change through a live dependency graph. Works in VS Code and Cursor.

Features

• Deep indexing — TypeScript, JavaScript, Python, Go, Ruby, Java, Rust, PHP, C/C++ supported
• Instant impact analysis — diff your working tree or any commit range and see affected files/symbols in seconds
• Visual blast-radius graph — interactive Cytoscape.js graph coloured by hop distance from the change
• AI summary — optional Claude or GPT-4 integration gives a plain-English risk assessment, suggested tests, and hotspot callouts
• Persistent index — SQLite-backed cache survives restarts; large repos load in under a second

Getting started

1. Open a workspace and wait for "Index complete" in the Overview panel
2. Click Analyze Impact (or Cmd+Shift+P → "Impact Lens: Analyze Impact")
3. Choose Working tree changes or Commit range
4. The blast-radius graph and AI summary appear instantly

AI setup (optional)

Cmd+Shift+P → "Impact Lens: Configure AI Provider" → pick Claude or GPT-4 → enter your API key. Keys are stored in VS Code SecretStorage and never written to disk.

Settings