Vast connects to your GitHub repo and shows what a code change actually breaks - before you commit it. Click a file, see dependencies, cycles, god services, overloaded modules. Built on tree-sitter, so it reads real imports, not just folder structure. Made for teams shipping AI-generated code (Cursor, Copilot, Claude etc.) who need to know the blast radius before merging. Source code is never stored - only the dependency graph. Free tier + early-bird Pro pricing.