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You can make a config key required by calling it with

config.require()

in the code rather than by defining the schema for it in the pulumi.yaml: https://www.pulumi.com/docs/intro/concepts/config/#:~:text=let%20name%20%3D%20config.require(%22name%22)%3B

Ah ok. Thanks! This was misleading to me, as the docs suggest the pattern you saw https://www.pulumi.com/docs/intro/concepts/config/#code with the example:

configuration:
  name:
    type: String
  lucky:
    default: 42
outputs:
  stdout: Hello, ${name} -- I see your lucky number is ${lucky}!

Ah! That is indeed the case if you are writing your pulumi program in YAML rather than any of the programming languages.

Ah okay, the string validation does seem to work for outputs. Just not within resources.

Ah okay, the string validation does seem to work for outputs. Just not within resources.

I'm not sure I understand - is this still in relation to configuration?

Yeah. Pulumi.yaml like this:

name: kubernetes
runtime: yaml
description: A minimal Google Cloud Pulumi YAML program
variables:
    project: ${pulumi.project}
configuration:
  cluster_name:
    type: String
resources:
  gke-cluster:
    type: gcp:container:Cluster
    properties:
      location: europe-west2
      name: ${cluster_name}

Produces this preview:

* #/config/cluster_name: oneOf failed
	* #/config/cluster_name: expected string, but got object
	* #/config/cluster_name: expected integer, but got object
	* #/config/cluster_name: expected boolean, but got object
	* #/config/cluster_name: expected array, but got object
	* #/config/cluster_name: doesn't validate with '/$defs/configTypeDeclaration'
	* #/config/cluster_name/type: doesn't validate with '/$defs/simpleConfigType'
	* #/config/cluster_name/type: value must be one of "string", "integer", "boolean", "array"

with this config

config:
  gcp:project: "new"
  kubernetes:cluster_name: "test"

But this might go back to your answer that YAML won't support this.

* #/config/cluster_name/type: value must be one of "string", "integer", "boolean", "array"

This last line implies that the type declaration in your pulumi.yaml should be lower-case:

configuration:
  cluster_name:
    type: string

But yeah, the docs have it as capitalized. Indeed confusing.