Allow defining user ID when creating score via SDK

[marcjaner]

It looks like there's currently no way of linking a session score to a given userId when using the public API (in our case the autogenerated Java SDK). Could this be included to the /api/public/scores​ endpoint.

I believe there's two possible approaches:

• via an optional userId parameter in the request body
• to allow passing it as metada, for example as langfuse.user.id

Would really appreciate some help here, as this would allow us to get much more value from our session scores.

[inkeep-ai-assistant[bot]]

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Based on the current API specification, the POST /api/public/scores endpoint does not include a userId parameter in the request body.(1) The available parameters for creating a score are:(1)

• comment
• configId
• dataType
• datasetRunId
• environment
• id
• metadata
• name
• observationId
• sessionId
• traceId
• value

However, there is an authorUserId field that appears in the score response schema when retrieving a score.(2) This suggests the system tracks who created the score, but this field is not currently exposed as a settable parameter when creating scores via the API.(1)

Your suggested approaches make sense:

1. Adding an optional userId or authorUserId parameter to the request body
2. Supporting it through metadata (e.g., langfuse.user.id)

Since this functionality isn't currently available in the API, I recommend opening a feature request in the Langfuse GitHub discussions or issues to request this enhancement. This would allow you to properly attribute session scores to specific users when creating them programmatically.

📚 Sources:

1. POST /api/public/scores
2. GET /api/public/v2/scores/{scoreId}

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[jannikmaierhoefer]

Hi @marcjaner, I am not quite sure if I understand your request. Could you share some more context why this would be useful in your workflow?