Mechanism◆Article

The way to responsibly merge a PR with over a million LLM-authored lines is a language-independent test suite with a million assertions plus adversarial code review, and to fix the process that generates the code rather than hand-fixing the code itself when something goes wrong.

The confidence-building strategy for merging a massive AI-generated rewrite combined a huge language-independent test suite, adversarial review, and fixing the generation process itself rather than patching individual bugs. ✦ AI generated

Jarred Sumner · Simon Willison's Weblog · 2026-07-08 · original ↗

Share card ↓Export .md Export .txt

Elicited by

“How do you review a PR with +1 million lines added? How do you start to build the confidence needed to responsibly merge large quantities of LLM-authored code?”

A language-independent test suite with a million assertions, adversarial code review and when something does go wrong, fixing the process that generates the code instead of hand-fixing the code.

Read full article ↗excerpt · fair-use quotation

✳ Bun ✳ Claude

Related moments

Claim◆Video · 9:24 · 2m

The problems teams are hitting with AI-generated code — tech debt, review bottlenecks, architecture drift — aren't new problems at all, and neither are the solutions; teams are just hitting them on fast-forward instead of over years.

Scott Tolinski · Syntax

Claim◆Video · 16:00 · 2m

Whether you should read AI-generated code is entirely situational — if it's a project you care about or production code, you must read it, but for throwaway personal scripts it's fine to auto-accept; and 'it works' is never sufficient justification for not reading code, since working code isn't necessarily good code.

Scott Tolinski · Syntax

Claim◆Video · 5:51 · 2m

Whether you read AI-generated code should depend entirely on the project: for personal projects and one-off scripts it's fine to auto-accept edits without reading, but for production code you ship to a company or contribute to, you should read it as an engineer.

Scott Tolinski · Syntax