command not found or TLS failures during setup, see Troubleshoot installation and login.
Except for Wrapper and IDE errors, which the launching program prints rather than Claude Code itself, these errors and recovery commands apply across the CLI, the Desktop app, and Claude Code on the web, since all three wrap the same Claude Code CLI. For other surface-specific issues, see the troubleshooting section on that surface’s page.
Claude Code calls the Claude API for model responses, so most runtime errors map to an underlying API error code. This page covers what each error means inside Claude Code and how to recover. For the raw HTTP status code definitions, see the Claude Platform error reference.