@rafaelobitten: After spending way too many tokens with Codex @OpenAIDevs especially Astra over the past week, I ended up adding these …
Summary
A developer shares coding guidelines added to AGENTS.md after using Codex to reduce overengineering, improve efficiency, and follow best practices like using open-source libraries and writing meaningful tests.
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Cached at: 09/16/26, 06:01 AM
After spending way too many tokens with Codex @OpenAIDevs especially Astra over the past week, I ended up adding these guidelines to the AGENTS.md in my ~/.codex.
They’ve helped a lot with cutting down on overengineering, unnecessary precautions, excessive testing, and rebuilding things that already have solid solutions out there:
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Prefer reliable, secure open-source libraries over building from scratch; when customization is needed, prefer supported extensions or extension points, and build from scratch only when existing options cannot efficiently meet the project’s requirements.
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Choose the simplest solution that meets the requirements; avoid overengineering and speculative abstractions.
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Always check current official API and library documentation; use version-compatible guidance rather than blindly upgrading.
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Write only tests that provide meaningful confidence and prevent regressions; avoid redundant tests and unjustified release gates.
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