Principle:Cohere ai Cohere python Bedrock Response Transformation
| Property | Value |
|---|---|
| Type | Principle |
| Domain | Response Transformation, AWS Bedrock, Adapter Pattern |
| Source | Cohere Python SDK |
| Last Updated | 2026-02-15 |
| Implemented By | Implementation:Cohere_ai_Cohere_python_Map_Response_From_Bedrock |
Overview
A response transformation pattern for converting AWS Bedrock response formats into standard Cohere SDK response types.
Description
Bedrock Response Transformation converts responses from AWS Bedrock's format into the standard Cohere SDK response types. Bedrock wraps responses differently: non-streaming responses use a standard JSON body, streaming responses use AWS's eventstream format with base64-encoded payloads. The transformation layer also extracts token counts from Bedrock-specific HTTP headers (X-Amzn-Bedrock-Input-Token-Count, X-Amzn-Bedrock-Output-Token-Count) since Bedrock reports usage differently than the direct API.
Usage
This is transparent to users of BedrockClientV2 — the response hook automatically transforms all responses. Understanding this is relevant for debugging Bedrock-specific issues.
- Non-streaming responses are parsed from JSON and mapped to Cohere response types
- Streaming responses are decoded from AWS eventstream format chunk by chunk
- Token usage is extracted from Bedrock-specific HTTP headers
- All transformation happens automatically in the response event hook
Theoretical Basis
The adapter pattern converts between incompatible interfaces. The response hook implements a transparent adapter that normalizes Bedrock's response format to match the standard SDK's expectations, enabling code portability.
- The adapter isolates Bedrock-specific format differences from the rest of the SDK
- Header-based token count extraction compensates for Bedrock's different usage reporting mechanism
- Eventstream decoding handles AWS's binary streaming protocol transparently