Knowledge Bases Retrieve: AWS Bedrock action

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. Tiny Command 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.

Action

Invoke Model (Raw)

Model-specific Invoke API for cases where the unified Converse API doesn't expose what you need (e.g., specific Claude-only parameters, specific generation modes for image/embedding models). Each model has its own request shape — check Bedrock's per-model docs.

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

The fields this action accepts.

Apps that pair well as the trigger for Knowledge Bases Retrieve.

Questions about Knowledge Bases Retrieve.

Other AWS Bedrock actions.

Send knowledge bases retrieve from your workflows.