use tool calls for json_object compatability with chat completions

[Ken Jiang (knjiang)]

This takes a similar approach to what we do in the proxy -> https://github.com/braintrustdata/braintrust-proxy/blob/main/packages/proxy/src/proxy.ts#L2791

i made the change and then ran make regenerate-failed-transforms which resulted in all the updated JSON files.

[Ken Jiang (knjiang)]

• use tool calls for json_object compatability with chat completions #174 👈 (View in Graphite)
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[Ken Jiang (knjiang)]

in practice:

JsonOutputFormat {
                schema: serde_json::from_value(json!({
                    "type": "object",
                    "additionalProperties": false
                }))
                .expect("static JSON object is always a valid Map"),
                json_output_format_type: JsonOutputFormatType::JsonSchema,
            }),

always emits an empty dictionary of {}, i thought we could set it like the above but no it doesn't work :(

see the transforms JSON showing we now produce abritrary json