Use it now
Useful4 Signal2
Interface crashes now print a readable message and tell you the classic-renderer env var.
What's wrong with this entry?
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CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=1
What
If the code drawing the interface throws and cannot recover, Claude Code prints a message saying it exited after an interface error. When the fullscreen renderer was still starting up, it also says the next launch will use the classic renderer and that CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=1 forces that renderer.
Details
- Applies to normal interactive use. SDK and debug paths still rethrow the original error so tooling can see it.
Evidence
Claude Code exited after an unrecoverable interface error
Strings lifted out of the shipped bundle, so the claim above can be checked against them.