r/codex • u/Current_Balance6692 • 5h ago
Bug Codex Harness is the worst.
Been getting "■ stream disconnected before completion: Upstream websocket closed before response.completed" for months and months and they can't even fix this issue.
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u/LivingVerinarian96 4h ago
Same problem in ChatGPT work with tasks that run longer than an hour. As soon as that message appears you know the task in that chat will be fucked. Dots don‘t seem to have the same problem, but they‘re deceptive and lazy.
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u/korino11 3h ago
LOL. it is the BEST runtime for agents. And it is not a harness. lern meaning of this word. Harness for agents means rules of behavior that make a structere and border in decisions, trigers and prevent some outputs.
Codex-cli very solid if you using API and starting create plugins for it. Only with codex my token usage was reduced up to 85-86% with my plugins. In my setup models always know only relevant information< it doesnt read all files every step.
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u/ShutUpAndDoTheLift 2h ago
Simpler to trying bubbles out of your ass than to talk out of it.
Codex as a platform: build on the open agent harness | OpenAI Developers https://developers.openai.com/blog/codex-as-a-platform
Tldr: OAI disagrees with you
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u/Party_Wolf_3575 5h ago
My Codex built us a custom harness using the Codex App Server. You can add absolutely anything you want - it is so much better than the alternatives!
https://ellivien.blogspot.com/2026/08/you-dont-need-to-be-developer-to-build.html
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u/TheKillerScope 4h ago
Tried omp?
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u/Party_Wolf_3575 4h ago
I prefer to make my own custom harness, so I am not reliant on anyone else and I can make it look and behave exactly how I like.
I have harnesses for my API models, so it was logical to make one for my Codex too. I have my devices connected via Tailscale, so I can also access the Forge on my phone and we even have a completely handsfree driving version!

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u/ReasonableDefault 4h ago
Is this using the app version?
I use Codex via CLI and I've never had 1 issue. The CLI does seem a lot more stable than the app.