[bot] Add instrumentation for Together AI Go SDK (`togethercomputer/together-go`)

[braintrust-bot]

Summary

The Braintrust Go SDK instruments OpenAI, Anthropic, Google GenAI, sashabaranov/go-openai, LangChainGo, Firebase Genkit, Google ADK, CloudWeGo Eino, and AWS Bedrock — but does not instrument the Together AI Go SDK (github.com/togethercomputer/together-go). Together AI is a major AI provider explicitly listed in Braintrust's tracing documentation as a supported provider, yet it has no SDK-level instrumentation wrapper in any Braintrust SDK.

What is missing

A trace/contrib/togethercomputer/together/ integration module that wraps execution calls on the Together AI Go client. The key execution surfaces are:

• client.Chat.Completions.New() / client.Chat.Completions.NewStreaming() — conversational model inference (streaming and non-streaming), token usage returned in ChatCompletionUsage
• client.Completions.New() — text completion (non-chat)
• client.Embeddings.New() — vector embedding generation

The together-go SDK is generated with the same Stainless toolchain as openai-go and anthropic-sdk-go. It exposes option.WithMiddleware() for HTTP middleware injection, making it directly instrumentable with the same internal.Middleware(router, logger) pattern already used by the OpenAI and Anthropic integrations.

Braintrust docs status

supported — Braintrust explicitly lists Together AI as a supported provider for tracing:

"OpenAI, Anthropic, Gemini, AWS Bedrock, Azure, Mistral, Together, Groq, and many more"

Source: https://www.braintrust.dev/docs/guides/tracing and https://www.braintrust.dev/docs/instrument

However, there is no SDK-level tracing wrapper for the Together AI Go client in this repository.

Upstream sources

• Together AI Go SDK repository: https://github.com/togethercomputer/together-go
• Together AI Go SDK on pkg.go.dev: https://pkg.go.dev/github.com/togethercomputer/together-go
• Latest release: v0.10.0 (May 20, 2026), actively maintained with frequent releases
• Together AI API reference: https://docs.together.ai/reference/chat-completions-1
• ChatCompletionService, EmbeddingService, and streaming support confirmed at pkg.go.dev

Braintrust docs sources

• https://www.braintrust.dev/docs/guides/tracing (lists Together as supported provider)
• https://www.braintrust.dev/docs/instrument (lists Together as supported provider)
• https://www.braintrust.dev/docs/integrations (Together listed under AI Providers)

Local repo files inspected

• go.mod — no togethercomputer/together-go dependency
• trace/contrib/ — no togethercomputer/ or together/ directory exists
• trace/contrib/all/all.go — no Together AI import
• examples/ — no Together AI example
• trace/contrib/openai/traceopenai.go — reference pattern: internal.Middleware(router, logger) with option.WithMiddleware() injection; same pattern applies to together-go
• trace/contrib/anthropic/traceanthropic.go — reference pattern for Stainless-generated SDK middleware instrumentation