AActionAWS BedrockUpdated June 2026

How do I run RAG retrieval against a Bedrock Knowledge Base?

Short answer: You can knowledge bases retrieve in AWS Bedrock by hand from its own interface, but it won’t repeat itself. On TinyCommand, add the AWS Bedrock Knowledge Bases Retrieve action to a workflow, map its 3 inputs from any upstream app, and it runs automatically every time the trigger fires. No code, and a free tier to start.

Use this action All 3 AWS Bedrock actions

Inputs

The fields this action accepts.

Every field can be mapped from an upstream trigger, AI step, table row, or hard-coded literal.

Field	Type	Required	Description
Knowledge Base ID knowledge_base_id	string	Required	Knowledge Base ID (required)
Query query	string	Required	Query (required)
Number of Results number_of_results	string	Optional	Number of Results

Sample request

{
  "knowledge_base_id": "{{trigger.knowledge_base_id}}",
  "query": "{{trigger.query}}",
  "number_of_results": "{{trigger.number_of_results}}"
}

Returns

{
  "retrievalResults": [
    {
      "score": 0.91,
      "content": {
        "text": "..."
      },
      "location": {
        "type": "S3",
        "s3Location": {
          "uri": "s3://x/y"
        }
      }
    }
  ]
}

Use these fields in downstream nodes for routing, logging, or error handling.

FAQ

Questions about Knowledge Bases Retrieve.

What does the Knowledge Bases Retrieve action do in AWS Bedrock?

Semantic-searches a configured Bedrock Knowledge Base (which sits on top of S3-stored documents indexed into a vector store) and returns the most relevant chunks with citations. Saves you from building and managing your own RAG ingestion pipeline.

What inputs does Knowledge Bases Retrieve require?

Required: Knowledge Base ID, Query. Every input accepts a static value or a variable from any upstream node in your workflow.

Can I use dynamic inputs from earlier workflow nodes?

Yes. Any field on this action can pull values from upstream nodes, whether that's a form response, a trigger payload, an AI output, or a lookup result.

What happens if AWS Bedrock returns an error?

The workflow pauses on the failed node, the error message is captured in the run log, and you can retry the run with one click. Auto-retry policies are configurable per workflow with exponential backoff up to 5 attempts.

Does Knowledge Bases Retrieve support batch operations?

Yes. Run Knowledge Bases Retrieve inside a Loop node to process arrays. TinyCommand handles AWS Bedrock's rate limits automatically so you don't have to throttle manually.

More actions

Other AWS Bedrock actions.

Action

Bedrock Converse

The model-agnostic chat API — same message-array shape works across Claude, Llama, Mistral, and other chat-capable Bedrock models. Swap models with a single parameter change. The recommended default for new Bedrock workflows since it abstracts away model-specific request quirks.