Struct ToJsonSchemaOptions 

pub struct ToJsonSchemaOptions {
    pub fields_always_required: bool,
    pub supports_format: bool,
    pub extract_descriptions: bool,
    pub top_level_must_be_object: bool,
    pub supports_additional_properties: bool,
}

Fields

fields_always_required: bool

If true, mark all fields as required. Use union type (with null) for optional fields instead. Models like OpenAI will reject the schema if a field is not required.

supports_format: bool

If true, the JSON schema supports the format keyword.

extract_descriptions: bool

If true, extract descriptions to a separate extra instruction.

top_level_must_be_object: bool

If true, the top level must be a JSON object.

supports_additional_properties: bool

If true, include additionalProperties: false in object schemas. Some LLM APIs (e.g., Gemini) do not support this constraint and will error.