You using models released this year? I hear this complaint a lot, and it's often due to using an old model which is not as good at tool calling as newer models.

What I noticed is that when the conversation starts the agent is pretty able to read from and write to files. As the conversation continues (and maybe sub agents are spawned) it forgets how to do this, complains, tries to resort to running shell or python code, sometimes it works. Sometimes it asks me to execute the code. If I refuse and point out it worked before than sometimes it remembers how to write, but mostly not and I need to start a new session.

When using Zed with the CoPilot integration I use Claude Opus and never had this issue.

Qwen 3.6 and 3.5...

Likewise, and that's with state of the art technology. I wish a true self-contained binary for Reasonix Desktop was released, for now I have to settle for providing a Flake.nix environment. It isn't nearly as fickle as Zed, but I wish they leveraged that power of the Go toolset more.