# Validation, diagnostics, and reload [Back to Gameplay programming](https://rustic-game-engine.pages.dev/markdown/guides/gameplay-programming.md). Source is UTF-8 and limited to 1 MiB. Validation compiles without execution before a snapshot or reload is sent. Snapshot and reload hashes are verified. During Play, **Reload Scripts** validates all manifest entries and sends only successful source over authenticated, bounded IPC. Replacement occurs at a simulation boundary. Existing typed properties and runtime transforms remain. Property-schema additions/removals currently require Restart Play; incompatible live replacement is rejected. A failed reload leaves the prior instance running. **Restart Play** rebuilds the immutable snapshot. Console records identify process and subsystem, collapse duplicates, filter/search, copy, clear, and open source/stack locations externally. Interactive debugging is not currently claimed.