Aws-cdk: Cryptic error message when stack tags use late-bound values

[moatazelmasry2]

When trying to add tags to a stack, I'm receiving the following error:
❌ MyStack failed: InvalidParameterType: Expected params.Tags[0].Value to be a string

Reproduction Steps

Here is how I'm adding tags:

const stack = new AccountSetupStack(app, 'AccountSetupStack', {
    "description": "Account setup"
});
stack.tags.setTag("StackName", cdk.Aws.STACK_NAME, 0, true)

Adding tags directly to the stack also produces the same error:

const stack = new AccountSetupStack(app, 'AccountSetupStack', {
    "description": "Account setup",
    "tags": {
        "StackName": cdk.Aws.STACK_NAME
    }
});
stack.tags.setTag("StackName", cdk.Aws.STACK_NAME, 0, true)

Environment

• **CLI Version : 1.22.0 (build 309ac1b)
• **Language : Typescript

---

This is :bug: Bug Report

[eladb]

CloudFormation stack tags are applied upon stack creation and not during deployment and therefore they cannot use pseudo parameters like Aws.STACK_NAME.

You can use stack.stackName instead, which is early-bound:

stack.tags.setTag('StackName', stack.stackName);

We should add a validation that will emit a more informative error.

[moatazelmasry2]

Thanks for explanation. I'm truly learning a lot here.

[moatazelmasry2]

I'd say @eladb answer resolves the issue. Thanks!!!