Around 70% of the Rails code I ship is AI-written. The 30% I keep under my own hands is the part that names the system: what things are, who is allowed to do what with them, where value moves between them. Any AI agent will generate code faster than anyone can read it.
Source: [Dev.to](https://dev.to/julianrubisch/how-much-of-your-codebase-should-ai-write-a-trust-zone-breakdown-2ldh)