Bedrock agent cannot correctly parse response from Node lambda

Question

I have a Bedrock agent with an action group connected to a lambda, and defined with an API schema. Despite ensuring that my lambda response matches the schema from the documentation (https://docs.aws.amazon.com/bedrock/latest/userguide/agents-lambda.html#agents-lambda-response), I still see the following error when the agent attempts to call my endpoint:

ERROR DependencyFailedException: The server encountered an error processing the Lambda response. Check the Lambda response and retry the request

This is what the lambda returns:

{
 "messageVersion": "1.0",
 "response": {
 "actionGroup": "downstream-actions",
 "apiPath": "/hello",
 "httpMethod": "GET",
 "httpStatusCode": 200,
 "responseBody": {
 "application/json": {
 "body": "{\"message\":\"Hello, world!\"}"
 }
 }
 }
}

The lambda is Node. I have tried stringifying the entire object before returning it as well to the same result. Am I missing something?

Edit: including api schema:

{
 openapi: '3.0.0',
 info: {
 title: 'Downstream Action API',
 version: '1.0.0',
 description: 'API for invoking downstream actions',
 },
 paths: {
 '/hello': {
 get: {
 summary: 'Get a hello world message',
 description: 'Simple endpoint that returns a hello world message',
 operationId: 'getHello',
 responses: {
 '200': {
 description: 'Successful response',
 content: {
 'application/json': {
 schema: {
 type: 'object',
 properties: {
 message: {
 type: 'string',
 },
 },
 },
 },
 },
 },
 },
 },
 },
 },
}

• emma ray: hard to say without also seeing your API schema
• Haskell: @emmaray updated to include

Answer 1

If anyone stumbles upon this question, I got it to work by setting architecture: lambda.Architecture.ARM_64 on my agent-invoked lambda.

Answer 2

The lambda function response should be in this format:

{
 messageVersion: event.messageVersion,
 response: {
 actionGroup: event.actionGroup,
 function: event.function,
 functionResponse: {
 responseBody: {
 "TEXT": { body: responseBody }
 }
 }
 }
}

P.S theresponseBody object should be a string so the agent can read it.