Vercel AI SDK `generateImage` not instrumented (wrapper and auto-instrumentation)

[braintrust-bot]

Summary

The Vercel AI SDK exports a stable generateImage() core function for generating images from text prompts, but neither the wrapper (wrapAISDK) nor the auto-instrumentation plugin instruments it. Calls to generateImage() produce no Braintrust spans. By contrast, the OpenAI Responses API's image_generation_call output type is already handled with special attachment conversion in this repo.

What is missing

• Wrapper (js/src/wrappers/ai-sdk/ai-sdk.ts): wrapAISDK only wraps generateText, streamText, generateObject, streamObject, and Agent class methods. No handling of generateImage.
• Auto-instrumentation config (js/src/auto-instrumentations/configs/ai-sdk.ts): Only defines configs for text/object generation and Agent variants. No config for generateImage.
• Channels (js/src/instrumentation/plugins/ai-sdk-channels.ts): No channel definition for generateImage.
• Plugin (js/src/instrumentation/plugins/ai-sdk-plugin.ts): No handler for image generation calls.
• Vendor types (js/src/vendor-sdk-types/ai-sdk-common.ts): AISDKNamespaceBase does not include generateImage.

Upstream reference

• AI SDK generateImage() reference: https://ai-sdk.dev/docs/reference/ai-sdk-core/generate-image
• Stable core function (not experimental) in AI SDK v6.
• Returns { image, images, usage, warnings, responses } where each image is a GeneratedFile with base64/Uint8Array/Buffer data plus media type.
• Supports parameters: model, prompt, n, size, aspectRatio, seed, maxRetries.

Braintrust docs status

The Braintrust tracing guide lists "Vercel AI SDK" as a supported integration but does not enumerate which AI SDK functions are covered. generateImage is not mentioned (not_found).

• https://www.braintrust.dev/docs/guides/tracing

Precedent in this repo

OpenAI Responses API image generation output is already enriched — processImagesInOutput in js/src/instrumentation/plugins/openai-plugin.ts converts image_generation_call base64 results to Braintrust Attachment objects. A similar approach could be used for AI SDK generateImage output.

Local files inspected

• js/src/wrappers/ai-sdk/ai-sdk.ts
• js/src/auto-instrumentations/configs/ai-sdk.ts
• js/src/instrumentation/plugins/ai-sdk-channels.ts
• js/src/instrumentation/plugins/ai-sdk-plugin.ts
• js/src/vendor-sdk-types/ai-sdk-common.ts
• js/src/instrumentation/plugins/openai-plugin.ts (for processImagesInOutput precedent)