See [Schema](https://ai.google.dev/api/caching#Schema:~:text=string-,Optional,-.%20A%20brief%20description) via [Function calling with the Gemini API](https://ai.google.dev/gemini-api/docs/function-calling?example=meeting#:~:text=specifically%20with%20a%20select%20subset%20of%20the%20OpenAPI%20schema%20format) https://github.com/flachesis/gemini-rust/blob/2f48d79cdb0c456fa2c30a9467884a5074653a0e/src/tools.rs#L124-L125
