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Built at Global Codex Hackathon: [London] · Apr 15, 2026 · London, UK

Demo video · Dependency upgrades are risky because developers usually do not know what will break until after they make the change. Reading changelogs and grepping a codebase is slow, incomplete, and hard to trust in larger systems. Domino solves this by showing exactly where a changed or removed API is used, what internal code depends on it, and how safe the upgrade is likely to be before the developer merges anything./…

Domino is a dependency-upgrade impact analyzer for Python codebases. Given a package and a version change, it builds a static dependency graph across the repo, diffs the package API between versions, matches the changed symbols to real code usage, and shows the blast radius across files, callers, tests, and entrypoints. It outputs a conservative upgrade verdict and structured evidence, and uses Codex to explain the findings in plain English.

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