/TECH

OpenAI Codex Code Review supports custom AGENTS.md rules

It automatically enforces and cites guidelines on pull requests

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3 posts, first seen 16h ago

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3 posts

Combined views

93.7K

3 posts, first seen 16h ago

1.2K likes comments

47 comments

758 saves

100 reposts

Sentiment

Positive93.5%6.5%Negative

Based on 28 visible X reactions from 45 accounts; directional sample.

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Custom Code Review rules for Codex | OpenAI Developers(OpenAI Developers)viajason

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BL Blanplan@blanplan

6:04 PM · Jul 21, 2026

@OpenAIDevs AGENTS.md rules are policy code. I’d test each new rule against historical PRs before merging it: does it catch the original defect, how many false positives does it create, and what context does it need? Otherwise repeated review comments become permanent automated noise.

AM Anees Merchant@aneesmerchant

10:24 PM · Jul 21, 2026

@jxnlco This is the highest return habit I have found with coding agents. Any review comment you find yourself repeating twice belongs in the rules file, and after a few weeks those reviews mostly go quiet. The trap is letting the file grow, mine works best under about 15 rules.

JM John Matthew Chubb@RGSsystems

11:36 AM · Jul 21, 2026

@OpenAIDevs I love this, and hopefully this helps me make more progress than I did with my last set of weekly usage. Thank you @OpenAI for all the work you do continuously improving your product

RF RH Fardin@rh_fardin

10:52 PM · Jul 21, 2026

@OpenAIDevs Repository-specific review rules in AGENTS.md is a big upgrade. The repeated reviewer nitpicks are exactly what should be automated.

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AT Ashutosh Tiwari | AI + Infra@ashutosh_270497

11:02 AM · Jul 21, 2026

@OpenAIDevs ohh wow, this is actually great feature which can help to improve code review accurately and efficiently!

DS David Stark@stark4833

11:06 AM · Jul 21, 2026

@OpenAIDevs If only there was another thing people kept repeating, just bring back 4o. #4oForAll

OD OpenAI Developers@OpenAIDevs

11:01 AM · Jul 21, 2026

1375TECH

Codex Code Review can now use custom repository rules in AGENTS.md. Start with a check your reviewers keep repeating. Keep it concise and scoped so Codex can catch repository-specific issues even when the relevant context is siloed. https://developers.openai.com/blog/custom-code-review-rules-for-codex

JA jason@jxnlco

11:19 AM · Jul 21, 2026

722TECH

codex tip: teach code review what your team keeps repeating. add a “Code Review Rules” section to AGENTS.md. codex will apply your repo-specific guidance and cite it on pull requests. https://developers.openai.com/blog/custom-code-review-rules-for-codex

47

758 saves

100 reposts

Sentiment

Positive93.5%6.5%Negative

Based on 28 visible X reactions from 45 accounts; directional sample.

Useful Links

Custom Code Review rules for Codex | OpenAI Developers(OpenAI Developers)viajason

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Ask a question below.

Published answers will appear here.

V(Vaibhav (VB) Srivastav@reach_vb

4:44 PM · Jul 21, 2026

1936TECH

Codex can now use custom review rules from AGENTS.md, so the context that usually lives in a few reviewers’ heads can be applied to every PR quite useful