Bedrock DocumentSource with s3Location throws validation error

[stabbylambda]

Checkboxes for prior research

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

I’m attempting to use the Bedrock DocumentSource to analyze a PDF stored in s3. I’ve tried with both InvokeModel and Converse but regardless of what command is used, the server returns a validation exception:

ValidationException: The model returned the following errors: messages.0.content.0.document.source.type: Field required

Regression Issue

• Select this option if this issue appears to be a regression.

SDK version number

@aws-sdk/client-bedrock-runtime@3.987.0

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

v24.5.0

Reproduction Steps

analyze-pdf-bedrock.ts

Observed Behavior

error.txt

Expected Behavior

According to the documentation, Bedrock should be able to grab the file from S3 and send it to the model.

Possible Solution

No response

Additional Information/Context

No response

[stabbylambda]

Just for kicks, I tried the same test case in python with boto3 and it gives the same result. Seems like there’s either an error in how the clients are generating the request with the union type or the bedrock service is wrong.

[aBurmeseDev]

Hi @stabbylambda - thanks for the reach out.

I'm checking this behavior with service team internally and will post updates. (ref P384582983)

[blunckr-aj]

This appears to be a problem in Go SDK as well