# PROTO
Descriptor/reflection configuration for method and type resolution.
## When to use
- Reflection is unavailable and you provide descriptors manually
- You need deterministic schema source in CI
## Minimal example
```gctf
--- PROTO ---
descriptor: ./descriptors/api.desc
```
## Rules
- Native mode supports `descriptor: <path>` and server reflection
- `PROTO files=...` is not supported in native mode
## Related
- [Command Line](../api/command-line)