[bot] Anthropic Bedrock SDK (`@anthropic-ai/bedrock-sdk`) not covered by auto-instrumentation

[braintrust-bot]

Summary

Anthropic publishes a dedicated TypeScript SDK for Claude on AWS Bedrock: @anthropic-ai/bedrock-sdk. It provides the same messages.create() API as @anthropic-ai/sdk but authenticates via AWS credentials and routes through the Bedrock runtime. This repository's auto-instrumentation exclusively targets @anthropic-ai/sdk module file paths; @anthropic-ai/bedrock-sdk ships under a different module path and is not patched by any existing instrumentation config. Users who use Claude on Bedrock via this SDK get no Braintrust spans from auto-instrumentation.

What instrumentation is missing

The @anthropic-ai/bedrock-sdk package exposes the same execution surface as @anthropic-ai/sdk:

SDK Method	Description
client.messages.create({ model, messages, ... })	Synchronous and streaming chat completions via Bedrock
client.messages.stream(...)	Streaming messages helper
client.beta.messages.create(...)	Extended-thinking and other beta APIs

Users instantiate it as:

import AnthropicBedrock from "@anthropic-ai/bedrock-sdk";

const client = new AnthropicBedrock({ awsRegion: "us-west-2" });
const message = await client.messages.create({
  model: "global.anthropic.claude-opus-4-6-v1",
  max_tokens: 256,
  messages: [{ role: "user", content: "Hello" }],
});

Auto-instrumentation gap:

The AST-transformation configs in js/src/auto-instrumentations/configs/anthropic.ts target @anthropic-ai/sdk at specific module file paths (resources/messages.mjs, resources/messages/messages.mjs, etc.). The @anthropic-ai/bedrock-sdk package has different internal module paths and is a separate npm package. None of the existing configs match @anthropic-ai/bedrock-sdk, so load-time or build-time AST patching does not apply to it.

Manual wrapper gap:

wrapAnthropic() duck-types on anthropic.messages.create, so it likely works with AnthropicBedrock instances. However, this is undocumented and untested in the repo, and auto-instrumentation (the zero-config path) is completely absent.

No coverage in the auto-instrumentation layer:

• No entry in js/src/auto-instrumentations/configs/anthropic.ts for @anthropic-ai/bedrock-sdk
• No module path targeting for @anthropic-ai/bedrock-sdk in any instrumentation config
• No e2e test scenarios for Bedrock SDK

A grep for bedrock-sdk across the entire repo returns zero matches.

Relationship to existing issue #1741

Issue #1741 covers @aws-sdk/client-bedrock-runtime — the low-level AWS SDK that exposes ConverseCommand and InvokeModelCommand. That is a different package with a different API shape (AWS-specific message format). @anthropic-ai/bedrock-sdk uses Anthropic's native Messages API format over Bedrock and is installed separately via npm install @anthropic-ai/bedrock-sdk.

Braintrust docs status

unclear — The Braintrust docs at https://www.braintrust.dev/docs/integrations/ai-providers/anthropic reference @anthropic-ai/sdk and the wrapAnthropic() wrapper, but do not mention @anthropic-ai/bedrock-sdk. The Anthropic Bedrock guide at https://platform.claude.com/docs/en/api/claude-on-amazon-bedrock shows @anthropic-ai/bedrock-sdk as the official TypeScript SDK for Claude on Bedrock.

Upstream references

• Official Anthropic Bedrock docs: https://platform.claude.com/docs/en/api/claude-on-amazon-bedrock
• @anthropic-ai/bedrock-sdk install: npm install @anthropic-ai/bedrock-sdk
• Anthropic client SDKs reference: https://platform.claude.com/docs/en/api/client-sdks

Local files inspected

• js/src/auto-instrumentations/configs/anthropic.ts — targets @anthropic-ai/sdk only, no entry for @anthropic-ai/bedrock-sdk
• js/src/instrumentation/plugins/anthropic-channels.ts — channels defined for @anthropic-ai/sdk APIs
• js/src/instrumentation/plugins/anthropic-plugin.ts — plugin handles @anthropic-ai/sdk events only
• js/src/wrappers/anthropic.ts — wrapAnthropic() duck-types on messages.create; likely works with Bedrock client but untested and undocumented
• js/src/vendor-sdk-types/anthropic.ts — no AnthropicBedrock type definitions
• Full repo grep for bedrock-sdk — zero matches