[BUG]: llmobs options are unusable due to internal type references

[mslynch]

Tracer Version(s)

2.4.0

Go Version(s)

go version go1.25.4 darwin/arm64

Bug Report

The *Option types used in github.com/DataDog/dd-trace-go/v2/llmobs, which are referenced in various public-facing functions, are unusable due to references to types in the internal internal/illmobs package.

The affected types are:

• StartSpanOption
• FinishSpanOption
• AnnotateOption
• EvaluationOption

Reproduction Code

package main

import (
	"context"
	"github.com/DataDog/dd-trace-go/v2/llmobs"
	illmobs "github.com/DataDog/dd-trace-go/v2/internal/llmobs"
)

func main() {
	llmobs.StartLLMSpan(context.TODO(), "foo", func(opts *illmobs.StartSpanConfig) {
		opts.MLApp = "bar"
	})
}

Error Logs

results in compilation error: use of internal package github.com/DataDog/dd-trace-go/v2/internal/llmobs not allowed

Go Env Output

No response

[hannahkm]

Thank you for opening this issue! This is indeed a bug. We will work on a fix and keep this ticket updated as needed.

[darccio]

Hi @mslynch, after commenting internally, we want to understand better what lead you to implement a custom option. Are you missing any specific option?

Although we could consider this a bug, it's a shared pattern with other products in dd-trace-go. Keep in mind this is an experimental SDK for LLMObs, so it's still evolving.

It'd be really helpful and appreciated to get your early feedback.