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Models ignoring plan mode in agentic harnesses

A recurring, reproducible failure mode: some models begin writing files while in plan mode instead of asking to switch to build mode, requiring manual interruption.

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A recurring, reproducible failure mode: some models begin writing files while in plan mode instead of asking to switch to build mode, requiring manual interruption.

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through here. So, okay, it's got some questions for us. Choose library. Tinier models are allowed to use raylib like Gemma 4 12-bit, but not big models like this. Now, I notice sometimes this happens, too, where they don't really seem to respect plan mode cuz we see it's trying to prepare right right there, but it should be like, "Oh, I'm in plan mode. I'm not allowed to write files." Like, switch it to build mode, and then I will. I'm going to interrupt it. Switch it to build mode. And then just let it fly. That happens sometimes. I don't know why, but it just does.