[BOT ISSUE] RubyLLM embed, paint, and transcribe APIs not instrumented

Comienza con lib/braintrust/contrib/ruby_llm/patcher.rb y lib/braintrust/contrib/ruby_llm/instrumentation/chat.rb para entender la instrumentación existente de ChatPatcher y Chat#complete. Después, inspecciona lib/braintrust/contrib/ruby_llm/integration.rb, que actualmente solo registra ChatPatcher. La tarea estará terminada cuando RubyLLM.embed, RubyLLM.paint y RubyLLM.transcribe estén instrumentados junto con las API de chat existentes.

Summary

RubyLLM provides three AI inference APIs beyond chat completions — RubyLLM.embed, RubyLLM.paint, and RubyLLM.transcribe — none of which are instrumented by this SDK. The current RubyLLM integration only instruments Chat#complete and Chat#execute_tool.

What is missing

1. Embeddings — RubyLLM::Embedding.embed / RubyLLM.embed

Creates vector embeddings from text. Returns an Embedding object with vectors, model, and input_tokens. Supports provider/model selection and dimensions parameter. This is a core inference API used for RAG and semantic search.

2. Image generation — RubyLLM::Image.paint / RubyLLM.paint

Generates images from text prompts. Returns an Image object with url, data, mime_type, revised_prompt, model_id. Supports model/provider/size selection.

3. Audio transcription — RubyLLM::Transcription.transcribe / RubyLLM.transcribe

Converts audio files to text. Returns a Transcription object with text, model, language, duration, segments, input_tokens, output_tokens. Has built-in token tracking useful for cost attribution.

All three are stable public APIs available since RubyLLM 1.8+ (the minimum version this SDK targets). Each is a single-method call with a simple request/response pattern (no streaming), making instrumentation straightforward.

Braintrust docs status

not_found — The Braintrust RubyLLM integration docs at https://www.braintrust.dev/docs/integrations/ai-sdks/ruby-llm describe support for chat completions across multiple providers and tool/function call tracing but do not mention embeddings, image generation, or transcription.

Upstream sources

• RubyLLM GitHub: https://github.com/crmne/ruby_llm
• RubyLLM docs for embeddings: https://rubyllm.com/guides/embeddings
• RubyLLM docs for image generation: https://rubyllm.com/guides/image-generation
• RubyLLM docs for audio transcription: https://rubyllm.com/guides/audio-transcription
• RubyLLM changelog: https://github.com/crmne/ruby_llm/releases — all three features predate the 1.8 minimum version

Local repo files inspected

• lib/braintrust/contrib/ruby_llm/patcher.rb — defines only ChatPatcher, no EmbeddingPatcher, ImagePatcher, or TranscriptionPatcher
• lib/braintrust/contrib/ruby_llm/instrumentation/chat.rb — only wraps Chat#complete and Chat#execute_tool
• lib/braintrust/contrib/ruby_llm/integration.rb — registers only the ChatPatcher