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[bot] AWS Bedrock Runtime: start_async_invoke() not instrumented #524

Description

@braintrust-bot

Summary

The AWS Bedrock Runtime start_async_invoke() API is not instrumented. Calls to client.start_async_invoke(...) produce zero Braintrust tracing. This method submits an asynchronous model invocation job — output is written to an S3 bucket — and is the Bedrock analog to batch inference APIs that are already instrumented for Anthropic (messages.batches.create()) and tracked as gaps for OpenAI (#295), Mistral (#272), and Google GenAI (#332).

The Bedrock Runtime integration was completed in #279 (closed 2026-06-16) and instruments the four synchronous execution surfaces. start_async_invoke was not included.

What is missing

Bedrock Runtime methodDescriptionInstrumented?
client.converse(...)Synchronous unified chatYes
client.converse_stream(...)Streaming unified chatYes
client.invoke_model(...)Synchronous raw model invocationYes
client.invoke_model_with_response_stream(...)Streaming raw invocationYes
client.start_async_invoke(...)Asynchronous model invocation jobNo

API details

  • Endpoint: POST /async-invoke
  • Purpose: Submit a long-running async model invocation. The caller supplies modelId, modelInput (provider-specific JSON), and outputDataConfig (S3 output location). The API returns an invocationArn immediately; output is written to S3 when complete.
  • Poll for results: Status checked via client.get_async_invoke(invocationArn=...) or client.list_async_invokes().
  • Use case: Large-scale batch generation workloads where latency is not time-sensitive (similar to Anthropic's Message Batches API or OpenAI's Batch API).

Minimum instrumentation for start_async_invoke

At minimum, start_async_invoke should create a span capturing:

Span fieldContent
inputmodelInput (parsed JSON body), modelId
outputinvocationArn, submission HTTP status
metadataprovider: "bedrock", model (from modelId), S3 output location, clientRequestToken if set
metricsSubmission latency

Span type should be SpanTypeAttribute.TASK, matching the Anthropic batch pattern.

Availability

start_async_invoke is in both boto3 matrix pins:

  • boto3==1.43.29 (latest)
  • boto3==1.34.116 (floor)

It is in the bedrock-runtime service (not bedrock-agent-runtime), so it is reachable via the same wrap_bedrock_client(client) helper that wraps the existing four methods.

Braintrust docs status

not_found — The AWS Bedrock integration page documents tracing for converse and invoke_model. No mention of async invocation.

Upstream sources

Local files inspected

  • py/src/braintrust/integrations/bedrock_runtime/patchers.py — defines ConversePatcher, ConverseStreamPatcher, InvokeModelPatcher, InvokeModelWithResponseStreamPatcher, composed into BedrockRuntimeClientMethodsPatcher; zero references to start_async_invoke
  • py/src/braintrust/integrations/bedrock_runtime/tracing.py_converse_wrapper, _converse_stream_wrapper, _invoke_model_wrapper, _invoke_model_stream_wrapper only; no async invoke wrappers
  • py/src/braintrust/integrations/bedrock_runtime/integration.py — registers BedrockRuntimeClientMethodsPatcher; no async invoke registration
  • py/src/braintrust/integrations/anthropic/tracing.py — Anthropic messages.batches.create() IS instrumented as a task-type span — reference implementation for this pattern
  • py/pyproject.toml[tool.braintrust.matrix.boto3] pins: latest = "boto3==1.43.29", "1.34.116" = "boto3==1.34.116"

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