The AI Record
A lot of our code is now written with an AI assistant in the loop. The first thing we tried was the obvious thing: ask the same Claude session that wrote the change to review it. That does not work. It missed critical bugs, and it missed them confidently, because it had already reasoned its way to believing the code was correct, and re-reading its own work only confirmed the conclusion.

Arthur VinbergHead of DevOps & IT · Leader, Ionix

Post: We built an AI PR reviewer. The hard part was teaching it to say nothing., Ionix blog, August 13, 2026, at A reviewer that didn’t write the code.

Checked against the source [ Grade B ] Said in the last year

Filed under

Who is speaking

Arthur Vinberg, Head of DevOps & IT. Wrote the post about a system his team built and runs; an insider describing his own company's tool, with no figures to audit.

How this was checked

Checked against the source by a first reader, then confirmed independently by a second reader who fetched the source without seeing the first reader's notes (Independent review agent (Claude Sonnet), blind second pass from passage text and citation only, no repository access, 2026-11-08).

Found verbatim, all six sentences, in 'A reviewer that didn't write the code'. Bylined Arthur Vinberg.

How to cite this passage

Arthur Vinberg (Ionix), “We built an AI PR reviewer. The hard part was teaching it to say nothing.”, Ionix blog, 2026-08-13, at A reviewer that didn’t write the code. https://www.ionix.io/blog/we-built-an-ai-pr-reviewer/ Archived at https://the-ai-record.com/passages/ionix-same-claude-session-review-missed-critical-bugs-2026

More from the same source

An agent that has silently lost its tools does not report that it lost its tools. It answers anyway, with the same fluency as before.

Arthur VinbergHead of DevOps & IT · Leader, Ionix

Context. From the post's account of a sandbox failure in which the review agent could not run any commands.

Post: We built an AI PR reviewer. The hard part was teaching it to say nothing., Ionix blog, August 13, 2026, at Two failures that taught us more than the design did.

Checked against the source [ Grade B ] Said in the last year Passage page

The first was cost. We were paying more for it than the results justified, and the obvious replacements wanted the same kind of money.

Arthur VinbergHead of DevOps & IT · Leader, Ionix

Context. The post's author explains why Ionix dropped Rovo, an AI review tool, before building its own reviewer; “it” in the passage is Rovo.

Post: We built an AI PR reviewer. The hard part was teaching it to say nothing., Ionix blog, August 13, 2026, at Why we built it instead of buying it.

Checked against the source [ Grade B ] Said in the last year Passage page

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