[bot] RubyLLM moderation API (`RubyLLM.moderate`) not instrumented

[braintrust-bot]

Summary

RubyLLM.moderate is a model execution call that invokes OpenAI's moderation API to classify text for harmful content. It is not instrumented by the Braintrust Ruby SDK. The existing RubyLLM integration only patches RubyLLM::Chat.

This is distinct from issue #136 (RubyLLM embed, paint, and transcribe APIs not instrumented), which covers three other non-chat RubyLLM execution surfaces but explicitly omits moderation.

What is missing

RubyLLM.moderate("text") (aliased as RubyLLM::Moderation.moderate) makes a live API request to OpenAI's moderation endpoint using models such as omni-moderation-latest or text-moderation-007. It returns a RubyLLM::Moderation object with:

• flagged — overall boolean
• Per-category flags and confidence scores
• id and model from the API response

This is the same class of execution call as the moderations already instrumented for the openai and ruby-openai integrations (ModerationsPatcher in both). A parallel RubyLLM::ModerationPatcher would follow the same pattern.

What a span should capture

• Input: the text string being moderated
• Metadata: model (e.g., omni-moderation-latest), provider (ruby_llm), endpoint
• Output: flagged categories and scores (or summary)
• Metrics: no token usage is returned by the moderation API, but latency should be captured

Braintrust docs status

not_found — The Braintrust RubyLLM integration docs at https://www.braintrust.dev/docs/integrations/sdk-integrations/ruby-llm cover chat completions and tool calls but do not mention moderation. The OpenAI provider docs at https://www.braintrust.dev/docs/providers/openai document moderation instrumentation via the openai gem but not via RubyLLM.

Upstream sources

• RubyLLM moderation docs: https://rubyllm.com/moderation/ — documents RubyLLM.moderate("text") making an API call to OpenAI's omni-moderation-latest model
• RubyLLM README: https://github.com/crmne/ruby_llm — lists RubyLLM.moderate under core capabilities

Local files inspected

• lib/braintrust/contrib/ruby_llm/patcher.rb — defines only ChatPatcher; no ModerationPatcher
• lib/braintrust/contrib/ruby_llm/integration.rb — registers only [ChatPatcher]; loaded? checks defined?(::RubyLLM::Chat) only
• lib/braintrust/contrib/openai/instrumentation/moderations.rb — demonstrates the existing moderation instrumentation pattern in this repo
• lib/braintrust/contrib/openai/patcher.rb (lines 131–170) — ModerationsPatcher for reference