Describe the bug

The Application construct for AppConfig provides a getLambdaLayerVersionArn method to use the AWS AppConfig Agent Lambda Extension with a Lambda function, but the layer versions are not up to date.

Regression Issue

• Select this option if this issue appears to be a regression.

Last Known Working CDK Library Version

No response

Expected Behavior

I expect to be able to use Application.getLambdaLayerVersionArn to get the latest version of the extension, currently listed as version 2.0.2037 from May 2025, e.g.

arn:aws:lambda:us-west-2:359756378197:layer:AWS-AppConfig-Extension-Arm64:164

Current Behavior

Application.getLambdaLayerVersionArn currently gives ARNs from the extension version 2.0.358 from December 2023, e.g.

arn:aws:lambda:us-west-2:359756378197:layer:AWS-AppConfig-Extension-Arm64:63

Reproduction Steps

import { App, Stack, StackProps, Token } from "aws-cdk-lib";
import { Application, Platform } from "aws-cdk-lib/aws-appconfig";

class MyStack extends Stack {
	constructor(scope: Construct, id: string, props?: StackProps) {
		super(scope, id, props);

		const region = Stack.of(this).region;
		if (Token.isUnresolved(region)) {
			throw new Error("Region of stack must be specified");
		}

		const appconfigLayerArn = Application.getLambdaLayerVersionArn(
			Stack.of(this).region,
			Platform.ARM_64
		);
		console.log(appconfigLayerArn);
	}
}

const app = new App();
new MyStack(app, "MyStack", { env: { region: "us-west-2" } });

Possible Solution

Could be addressed by updating the values in lambdaLayerVersions.

I also see there's a separate mapping APPCONFIG_LAMBDA_LAYER_ARNS in region-info/build-tools/fact-table.ts with even older versions from 2.0.181?

Additional Information/Context

Version notes: Understanding available versions of the AWS AppConfig Agent Lambda extension

Specifically trying to use newer version for multi-variant feature flags.

AWS CDK Library version (aws-cdk-lib)

2.221.1

AWS CDK CLI version

N/A

Node.js Version

N/A

OS

N/A

Language

TypeScript

Language Version

No response

Other information

Would also appreciate if the construct could return something like an ILayerVersion so we don't have to do LayerVersion.fromLayerVersionArn, but that's a separate ask.