File Not Propagated from Supervisor Agent to Sub-Agents in Bedrock Console

You're correct that files uploaded to a Bedrock Supervisor Agent in the console aren't automatically propagated to sub-agents (collaborator agents) in the same way that text prompts are.

This is a known limitation in the current implementation of multi-agent collaboration in Amazon Bedrock. The state sharing between agents, particularly for files and other structured data, doesn't happen automatically.

To share files between agents in a multi-agent setup, you'll need to implement one of these approaches:

1. Have the supervisor agent explicitly pass the necessary file data to each collaborator agent when delegating tasks. This can be done through the conversationHistory field, which is designed for multi-agent collaboration.

2. Ensure that conversationalHistorySharing is enabled for each collaborator agent in your configuration. This allows them to receive context passed by the supervisor agent.

3. When using the API (rather than the console), you can use the sessionState parameter with a "files" field to reference files. For example:

sessionState={
"files": [
{
"name": "your_file.txt",
"source": {
"s3Location": {
"uri": "s3://your-bucket-name/your_file.txt"
},
"sourceType": "S3"
},
"useCase": "CHAT"
}
]
}

4. For the supervisor agent, you might need to modify its instructions to explicitly handle file sharing with collaborator agents.

This limitation is part of the current design of Bedrock's multi-agent collaboration system, where state sharing between agents requires explicit handling rather than happening automatically.
Sources
Issue Sharing State Across Agents in Amazon Bedrock | AWS re:Post
Bedrock Agent API Ignores inputFiles Parameter but Console Works | AWS re:Post