This might be Pi being buggy as heck.

When using opencode or copilot CLI, the error messages are displayed normally and it's possible to see what's going on. Under Pi, it sometimes just hangs, or Pi crashes with some bun stacktrace and that's it.

Copilot has introduced additional limits for Claude models in past month, and it's rather easy to hit it. Pi often doesn't show anything when this limit hits (although sometimes it shows the error, I guess it depends on Pi version).