I built an open-source CLI to catch breaking AST contract changes and blast radius in Git diffs
This story is from 2026-09-07. It is preserved in the archive; the latest stories are on the live feed.
Hey everyone, When reviewing diffs or AI-generated PRs, changing a function return or widening an optional parameter can look like a safe 2-line diff, but it quietly breaks multiple downstream consumers. To solve this, I built Change Firewall — an offline-first TypeScript AST analyzer and CLI that…
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- 2026-09-07 12:12 · r/ChatGPTCoding
I built an open-source CLI to catch breaking AST contract changes and blast radius in Git diffs